An amplifier is a device for increasing the power of a signal by use of an external energy source.

In an electronic amplifier, the input "signal" is usually a voltage or a current. Other types exist; a fluidic amplifier increases the power of signals represented as flow of gas or liquid, for example. Amplifiers may be classified in a variety of ways depending on their application, the frequency range they cover, or the active devices used. Ideally an amplifier increases the power of a signal without otherwise altering it; practical amplifiers have finite distortion and noise which they invariably add to the signal.

A device that converts signals from one type to another (for example, a light signal in photons to a DC signal in amperes) is a transducer, a transformer, or a sensor. However, none of these amplify power.

Figures of merit[link]

The quality of an amplifier can be characterized by a number of specifications, listed below.

Gain[link]

The gain of an amplifier is the ratio of output to input power or amplitude, and is usually measured in decibels. (When measured in decibels it is logarithmically related to the power ratio: G(dB)=10 log(P_out /(P_in)). RF amplifiers are often specified in terms of the maximum power gain obtainable, while the voltage gain of audio amplifiers and instrumentation amplifiers will be more often specified (since the amplifier's input impedance will often be much higher than the source impedance, and the load impedance higher than the amplifier's output impedance). For example, an audio amplifier with a gain given as 20 dB will have a voltage gain of ten (but a power gain of 100 would only occur in the event the input and output impedances were identical).

If two equivalent amplifiers are being compared, the amplifier with higher gain settings would be more sensitive as it would take less input signal to produce a given amount of power.^[1]

Bandwidth[link]

The bandwidth of an amplifier is the range of frequencies for which the amplifier gives "satisfactory performance". The definition of "satisfactory performance" may be different for different applications. However, a common and well-accepted metric is the half power points (i.e. frequency where the power goes down by half its peak value) on the output vs. frequency curve. Therefore bandwidth can be defined as the difference between the lower and upper half power points. This is therefore also known as the −3 dB bandwidth. Bandwidths (otherwise called "frequency responses") for other response tolerances are sometimes quoted (−1 dB, −6 dB etc.) or "plus or minus 1dB" (roughly the sound level difference people usually can detect).

The gain of a good quality full-range audio amplifier will be essentially flat between 20 Hz to about 20 kHz (the range of normal human hearing). In ultra high fidelity amplifier design, the amp's frequency response should extend considerably beyond this (one or more octaves either side) and might have −3 dB points < 10 Hz and > 65 kHz. Professional touring amplifiers often have input and/or output filtering to sharply limit frequency response beyond 20 Hz-20 kHz; too much of the amplifier's potential output power would otherwise be wasted on infrasonic and ultrasonic frequencies, and the danger of AM radio interference would increase. Modern switching amplifiers need steep low pass filtering at the output to get rid of high frequency switching noise and harmonics.

Efficiency[link]

Efficiency is a measure of how much of the power source is usefully applied to the amplifier's output. Class A amplifiers are very inefficient, in the range of 10–20% with a max efficiency of 25% for direct coupling of the output. Inductive coupling of the output can raise their efficiency to a maximum of 50%.

Drain efficiency is the ratio of output RF power to input DC power when primary input DC power has been fed to the drain of an FET. Based on this definition, the drain efficiency cannot exceed 25% for a class A amplifier that is supplied drain bias current through resistors (because RF signal has its zero level at about 50% of the input DC). Manufacturers specify much higher drain efficiencies, and designers are able to obtain higher efficiencies by providing current to the drain of the transistor through an inductor or a transformer winding. In this case the RF zero level is near the DC rail and will swing both above and below the rail during operation. While the voltage level is above the DC rail current is supplied by the inductor.

Class B amplifiers have a very high efficiency but are impractical for audio work because of high levels of distortion (See: Crossover distortion). In practical design, the result of a tradeoff is the class AB design. Modern Class AB amplifiers commonly have peak efficiencies between 30–55% in audio systems and 50-70% in radio frequency systems with a theoretical maximum of 78.5%.

Commercially available Class D switching amplifiers have reported efficiencies as high as 90%. Amplifiers of Class C-F are usually known to be very high efficiency amplifiers. RCA manufactured an AM broadcast transmitter employing a single class-C low mu triode with an RF efficiency in the 90% range.

More efficient amplifiers run cooler, and often do not need any cooling fans even in multi-kilowatt designs. The reason for this is that the loss of efficiency produces heat as a by-product of the energy lost during the conversion of power. In more efficient amplifiers there is less loss of energy so in turn less heat.

In RF linear Power Amplifiers, such as cellular base stations and broadcast transmitters, special design techniques can be used to improve efficiency. Doherty designs, which use a second output stage as a "peak" amplifier, can lift efficiency from the typical 15% up to 30-35% in a narrow bandwidth. Envelope Tracking designs are able to achieve efficiencies of up to 60%, by modulating the supply voltage to the amplifier in line with the envelope of the signal.

Linearity[link]

An ideal amplifier would be a totally linear device, but real amplifiers are only linear within limits.

When the signal drive to the amplifier is increased, the output also increases until a point is reached where some part of the amplifier becomes saturated and cannot produce any more output; this is called clipping, and results in distortion.

In most amplifiers a reduction in gain takes place before hard clipping occurs; the result is a compression effect, which (if the amplifier is an audio amplifier) sounds much less unpleasant to the ear. For these amplifiers, the 1 dB compression point is defined as the input power (or output power) where the gain is 1 dB less than the small signal gain. Sometimes this non linearity is deliberately designed in to reduce the audible unpleasantness of hard clipping under overload.

Ill effects of non linearity can be reduced with negative feedback.

Linearization is an emergent field, and there are many techniques, such as feed forward, predistortion, postdistortion, in order to avoid the undesired effects of the non-linearities.

Noise[link]

This is a measure of how much noise is introduced in the amplification process. Noise is an undesirable but inevitable product of the electronic devices and components; also, much noise results from intentional economies of manufacture and design time. The metric for noise performance of a circuit is noise figure or noise factor. Noise figure is a comparison between the output signal to noise ratio and the thermal noise of the input signal.

Output dynamic range[link]

Output dynamic range is the range, usually given in dB, between the smallest and largest useful output levels. The lowest useful level is limited by output noise, while the largest is limited most often by distortion. The ratio of these two is quoted as the amplifier dynamic range. More precisely, if S = maximal allowed signal power and N = noise power, the dynamic range DR is DR = (S + N ) /N.^[2]

In many switched mode amplifiers, dynamic range is limited by the minimum output step size.

Slew rate[link]

Slew rate is the maximum rate of change of the output, usually quoted in volts per second (or microsecond). Many amplifiers are ultimately slew rate limited (typically by the impedance of a drive current having to overcome capacitive effects at some point in the circuit), which sometimes limits the full power bandwidth to frequencies well below the amplifier's small-signal frequency response.

Rise time[link]

The rise time, t_r, of an amplifier is the time taken for the output to change from 10% to 90% of its final level when driven by a step input. For a Gaussian response system (or a simple RC roll off), the rise time is approximated by:

t_r * BW = 0.35, where t_r is rise time in seconds and BW is bandwidth in Hz.

Settling time and ringing[link]

The time taken for the output to settle to within a certain percentage of the final value (for instance 0.1%) is called the settling time, and is usually specified for oscilloscope vertical amplifiers and high accuracy measurement systems. Ringing refers to an output variation that cycles above and below an amplifier's final value and leads to a delay in reaching a stable output. Ringing is the result of overshoot caused by an underdamped circuit.

Overshoot[link]

In response to a step input, the overshoot is the amount the output exceeds its final, steady-state value.

Stability[link]

Stability is an issue in all amplifiers with feedback, whether that feedback is added intentionally or results unintentionally. It is especially an issue when applied over multiple amplifying stages.

Stability is a major concern in RF and microwave amplifiers. The degree of an amplifier's stability can be quantified by a so-called stability factor. There are several different stability factors, such as the Stern stability factor and the Linvil stability factor, which specify a condition that must be met for the absolute stability of an amplifier in terms of its two-port parameters.

Electronic amplifiers[link]

There are many types of electronic amplifiers, commonly used in radio and television transmitters and receivers, high-fidelity ("hi-fi") stereo equipment, microcomputers and other electronic digital equipment, and guitar and other instrument amplifiers. Critical components include active devices, such as vacuum tubes or transistors.

Other amplifier types[link]

Carbon microphone[link]

One of the first devices used to amplify signals was the carbon microphone (effectively a sound-controlled variable resistor). By channeling a large electric current through the compressed carbon granules in the microphone, a small sound signal could produce a much larger electric signal. The carbon microphone was extremely important in early telecommunications; analog telephones in fact work without the use of any other amplifier. Before the invention of electronic amplifiers, mechanically coupled carbon microphones were also used as amplifiers in telephone repeaters for long distance service.

Magnetic amplifier[link]

A magnetic amplifier is a transformer-like device that makes use of the saturation of magnetic materials to produce amplification. It is a non-electronic electrical amplifier with no moving parts. The bandwidth of magnetic amplifiers extends to the hundreds of kilohertz.

Rotating electrical machinery amplifier[link]

A Ward Leonard control is a rotating machine like an electrical generator that provides amplification of electrical signals by the conversion of mechanical energy to electrical energy. Changes in generator field current result in larger changes in the output current of the generator, providing gain. This class of device was used for smooth control of large motors, primarily for elevators and naval guns.

Field modulation of a very high speed AC generator was also used for some early AM radio transmissions.^[3] See Alexanderson alternator.

Johnsen-Rahbek effect amplifier[link]

The earliest form of audio power amplifier was Edison's "electromotograph" loud-speaking telephone, which used a wetted rotating chalk cylinder in contact with a stationary contact. The friction between cylinder and contact varied with the current, providing gain. Edison discovered this effect in 1874, but the theory behind the Johnsen-Rahbek effect was not understood until the semiconductor era.

Mechanical amplifiers[link]

Mechanical amplifiers were used in the pre-electronic era in specialized applications.

Early autopilot units designed by Elmer Ambrose Sperry incorporated a mechanical amplifier using belts wrapped around rotating drums; a slight increase in the tension of the belt caused the drum to move the belt. A paired, opposing set of such drives made up a single amplifier. This amplified small gyro errors into signals large enough to move aircraft control surfaces. A similar mechanism was used in the Vannevar Bush differential analyzer.

The electrostatic drum amplifier used a band wrapped partway around a rotating drum, and fixed at its anchored end to a spring. The other end connected to a speaker cone. The input signal was transformed up to high voltage, and added to a high voltage dc supply line. This voltage was connected between drum and belt. Thus the input signal varied the electric field between belt and drum, and thus the friction between them, and thus the amount of lateral movement of the belt and thus speaker cone.

Other variations on the theme also existed at one time.

Optical amplifiers[link]

Optical amplifiers amplify light through the process of stimulated emission. See Laser and Maser.

Miscellaneous types[link]

• There are also mechanical amplifiers, such as the automotive servo used in braking.
• Relays can be included under the above definition of amplifiers, although their transfer function is not linear (that is, they are either open or closed).
• Also purely mechanical manifestations of such digital amplifiers can be built (for theoretical, instructional purposes, or for entertainment), see e.g. domino computer.
• Another type of amplifier is the fluidic amplifier, based on the fluidic triode.

See also[link]

Electronics portal

Wikimedia Commons has media related to: Hi-Fi amplifiers

• Attenuator (electronics)
• Low noise amplifier
• Negative feedback amplifier
• Preamplifier

References[link]

External links[link]

• Efficiency of Microwave Devices

Imran Khan Niazi عمران خان نیازی
Personal details
Born	(1952-11-25) 25 November 1952 (age 59) Lahore, West Punjab, Dominion of Pakistan
Political party	Pakistan Tehreek-e-Insaf
Spouse(s)	Jemima Khan (1995–2004)
Children	Sulaiman Qasim Khan
Residence	Lahore, Punjab, Pakistan
Alma mater	Keble College, Oxford
Occupation	Politician Philanthropist Cricketer
Religion	Islam
Website	PTI

Imran Khan Niazi (Urdu: عمران خان نیازی; born 25 November 1952) is a Pakistani politician and former cricketer, playing international cricket for two decades in the late twentieth century. After retiring, he entered politics. Currently, besides his political activism, Khan is also a philanthropist, cricket commentator, Chancellor of the University of Bradford and Founder and Chairman Board of Governors of Shaukat Khanum Memorial Cancer Hospital & Research Centre.

Arguably Pakistan's most successful cricket captain, Khan played for the Pakistani cricket team from 1971 to 1992 and served as its captain intermittently throughout 1982–1992.^[1] After retiring from cricket at the end of the 1987 World Cup, he was called back to join the team in 1988. At 39, Khan led his teammates to Pakistan's first and only World Cup victory in 1992. He has a record of 3807 runs and 362 wickets in Test cricket, making him one of eight world cricketers to have achieved an 'All-rounder's Triple' in Test matches.^[2] On 14 July 2010, Khan was inducted into the ICC Cricket Hall of Fame.^[3]

In April 1996, Khan founded and became the chairman of a political party Pakistan Tehreek-e-Insaf (Movement for Justice).^[4] He represented Mianwali as a member of the National Assembly from November 2002 to October 2007.^[5] Foreign Policy magazine has described him as "Pakistan's Ron Paul".^[6]

Through worldwide fundraising, he has also helped establish the Shaukat Khanum Memorial Cancer Hospital & Research Centre in 1996 and Mianwali's Namal College in 2008.

Family, education, and personal life[link]

Imran Khan was born in Lahore, the only son of Ikramullah Khan Niazi, a civil engineer, and his wife Shaukat Khanum.^[7] Although long settled in Mianwali in Punjab, the family were of Pashtun ethnicity and belonged to the Niazi Shermankhel tribe.^[8] A quiet and shy boy in his youth, Khan grew up with his four sisters in relatively affluent (upper middle-class) circumstances^[9] and received a privileged education. He was educated the Cathedral School in Lahore, the Royal Grammar School Worcester in England, where he excelled at cricket, and at Aitchison College, Lahore. In 1972, he enrolled to study Philosophy, Politics and Economics at Keble College, Oxford, where he graduated with a second-class degree in Politics and a third in Economics.^[10] Khan's mother hailed from the Burki family which had produced several successful hockey players,^[7] as also cricketers such as Javed Burki and Majid Khan.^[8] Early in life, Khan developed an interest in cricket, which is an extremely popular sport in Pakistan.

Marriage to Jemima Marcelle Goldsmith[link]

On 16 May 1995, Khan married Jemima Goldsmith, in an Islamic ceremony in Paris. A month later, on 21 June, they were married again in a civil ceremony at the Richmond register office in England, followed by a reception at the Goldsmiths' house in Surrey.^[11] . The marriage, described as "tough" by Khan,^[8] produced two sons, Sulaiman Isa (born 18 November 1996) and Kasim (born 10 April 1999).^[12] As an agreement of his marriage, Khan spent four months a year in England. On 22 June 2004, it was announced that the Khans had divorced because it was "difficult for Jemima to adapt to life in Pakistan".^[13] The marriage ended amicably. Imran has regular access to his children and his relationship with his ex-wife is friendly. Khan now resides in Bani Gala, Islamabad, where he built a farmhouse with the money he gained from selling his London flat. He grows fruit trees, wheat, and keeps cows, while also maintaining a cricket ground for his two sons, who visit during their holidays.^[8]

Cricket career[link]

Pride of Performance Award Recipient
Imran Khan was recipient of the Pride of Performance Award 1983
Presented by	Islamic Republic of Pakistan
Date	1983
Country	Islamic Republic of Pakistan

Khan made a lacklustre first-class cricket debut at the age of sixteen in Lahore. By the start of the 1970s, he was playing for his home teams of Lahore A (1969–70), Lahore B (1969–70), Lahore Greens (1970–71) and, eventually, Lahore (1970–71).^[14] Khan was part of Oxford University's Blues Cricket team during the 1973–75 seasons.^[10] At Worcestershire, where he played county cricket from 1971 to 1976, he was regarded as only an average medium pace bowler. During this decade, other teams represented by Khan include Dawood Industries (1975–76) and Pakistan International Airlines (1975–76 to 1980–81). From 1983 to 1988, he played for Sussex.^[2]

In 1971, Khan made his Test cricket debut against England at Birmingham. Three years later, he debuted in the One Day International (ODI) match, once again playing against England at Nottingham for the Prudential Trophy. After graduating from Oxford and finishing his tenure at Worcestershire, he returned to Pakistan in 1976 and secured a permanent place on his native national team starting from the 1976–77 season, during which they faced New Zealand and Australia.^[14] Following the Australian series, he toured the West Indies, where he met Tony Greig, who signed him up for Kerry Packer's World Series Cricket.^[2] His credentials as one of the fastest bowlers of the world started to establish when he finished third at 139.7 km/h in a fast bowling contest at Perth in 1978, behind Jeff Thomson and Michael Holding, but ahead of Dennis Lillee, Garth Le Roux and Andy Roberts.^[2]

As a fast bowler, Khan reached the peak of his powers in 1982. In 9 Tests, he got 62 wickets at 13.29 each, the lowest average of any bowler in Test history with at least 50 wickets in a calendar year.^[15] In January 1983, playing against India, he attained a Test bowling rating of 922 points. Although calculated retrospectively (ICC player ratings did not exist at the time), Khan's form and performance during this period ranks third in the ICC's All-Time Test Bowling Rankings.^[16]

Khan achieved the all-rounder's triple (securing 3000 runs and 300 wickets) in 75 Tests, the second fastest record behind Ian Botham's 72. He is also established as having the second highest all-time batting average of 61.86 for a Test batsman playing at position 6 of the batting order.^[17] He played his last Test match for Pakistan in January 1992, against Sri Lanka at Faisalabad. Khan retired permanently from cricket six months after his last ODI, the historic 1992 World Cup final against England at Melbourne, Australia.^[18] He ended his career with 88 Test matches, 126 innings and scored 3807 runs at an average of 37.69, including six centuries and 18 fifties. His highest score was 136 runs. As a bowler, he took 362 wickets in Test cricket, which made him the first Pakistani and world's fourth bowler to do so.^[2] In ODIs, he played 175 matches and scored 3709 runs at an average of 33.41. His highest score remains 102 not out. His best ODI bowling is documented at 6 wickets for 14 runs.

Captaincy[link]

At the height of his career, in 1982, the thirty-year-old Khan took over the captaincy of the Pakistan cricket team from Javed Miandad. Recalling his initial discomfort with this new role, he later said, "When I became the cricket captain, I couldn’t speak to the team directly I was so shy. I had to tell the manager, I said listen can you talk to them, this is what I want to convey to the team. I mean early team meetings I use to be so shy and embarrassed I couldn’t talk to the team."^[19] As a captain, Khan played 48 Test matches, out of which 14 were won by Pakistan, 8 lost and the rest of 26 were drawn. He also played 139 ODIs, winning 77, losing 57 and ending one in a tie.^[2]

In the team's second match under his leadership, Khan led them to their first Test win on English soil for 28 years at Lord's.^[20] Khan's first year as captain was the peak of his legacy as a fast bowler as well as an all-rounder. He recorded the best Test bowling of his career while taking 8 wickets for 58 runs against Sri Lanka at Lahore in 1981–82.^[2] He also topped both the bowling and batting averages against England in three Test series in 1982, taking 21 wickets and averaging 56 with the bat. Later the same year, he put up a highly acknowledged performance in a home series against the formidable Indian team by taking 40 wickets in six Tests at an average of 13.95. By the end of this series in 1982–83, Khan had taken 88 wickets in 13 Test matches over a period of one year as captain.^[14]

Imran Khan's test career bowling statistics

This same Test series against India, however, also resulted in a stress fracture in his shin that kept him out of cricket for more than two years. An experimental treatment funded by the Pakistani government helped him recover by the end of 1984 and he made a successful comeback to international cricket in the latter part of the 1984–85 season.^[2]

In 1987, Khan led Pakistan to its first ever Test series win in India, which was followed by Pakistan's first series victory in England the same year.^[20] During the 1980s, his team also recorded three creditable draws against the West Indies. India and Pakistan co-hosted the 1987 World Cup, but neither ventured beyond the semi-finals. Khan retired from international cricket at the end of the World Cup. In 1988, he was asked to return to the captaincy by the President Of Pakistan, General Zia-Ul-Haq, and on 18 January, he announced his decision to rejoin the team.^[2] Soon after returning to the captaincy, Khan led Pakistan to another winning tour in the West Indies, which he has recounted as "the last time I really bowled well".^[8] He was declared Man of the Series against West Indies in 1988 when he took 23 wickets in 3 tests.^[2]

Khan's career-high as a captain and cricketer came when he led Pakistan to victory in the 1992 Cricket World Cup. Playing with a brittle batting line-up, Khan promoted himself as a batsman to play in the top order along with Javed Miandad, but his contribution as a bowler was minimal. At the age of 39, Khan scored the highest runs of all the Pakistani batsmen and took the winning last wicket himself.^[14]

Post-retirement[link]

In 1994, Khan had admitted that, during Test matches, he "occasionally scratched the side of the ball and lifted the seam." He had also added, "Only once did I use an object. When Sussex were playing Hampshire in 1981 the ball was not deviating at all. I got the 12th man to bring out a bottle top and it started to move around a lot."^[21] In 1996, Khan successfully defended himself in a libel action brought forth by former English captain and all-rounder Ian Botham and batsman Allan Lamb over comments they alleged were made by Khan in two articles about the above-mentioned ball-tampering and another article published in an Indian magazine, India Today. They claimed that, in the latter publication, Khan had called the two cricketers "racist, ill-educated and lacking in class." Khan protested that he had been misquoted, saying that he was defending himself after having admitted that he tampered with a ball in a county match 18 years ago.^[22] Khan won the libel case, which the judge labelled a "complete exercise in futility", with a 10–2 majority decision by the jury.^[22]

Since retiring, Khan has written opinion pieces on cricket for various British and Asian newspapers, especially regarding the Pakistani national team. His contributions have been published in India's Outlook magazine,^[23] the Guardian,^[24] the Independent, and the Telegraph. Khan also sometimes appears as a cricket commentator on Asian and British sports networks, including BBC Urdu^[25] and the Star TV network.^[26] In 2004, when the Indian cricket team toured Pakistan after 14 years, he was a commentator on TEN Sports' special live show, Straight Drive,^[27] while he was also a columnist for sify.com for the 2005 India-Pakistan Test series.^[28] He has provided analysis for every cricket World Cup since 1992, which includes providing match summaries for BBC during the 1999 World Cup.^[28]

In November 2009 Khan underwent emergency surgery at Lahore's Shaukat Khanum Cancer Hospital to remove an obstruction in his small intestine.^[29]

Social work[link]

For more than four years after retiring from cricket in 1992, Khan focused his efforts solely on social work. By 1991, he had founded the Shaukat Khanum Memorial Trust, a charity organisation bearing the name of his mother, Mrs. Shaukat Khanum. As the Trust's maiden endeavour, Khan established Pakistan's first and only cancer hospital, constructed using donations and funds exceeding $25 million, raised by Khan from all over the world.^[4] Inspired by the memory of his mother, who died of cancer, the Shaukat Khanum Memorial Cancer Hospital & Research Centre, a charitable cancer hospital with 75 percent free care, opened in Lahore on 29 December 1994.^[8] Khan currently serves as the chairman of the hospital and continues to raise funds through charity and public donations.^[30]

During the 1990s, Khan also served as UNICEF's Special Representative for Sports^[31] and promoted health and immunisation programmes in Bangladesh, Pakistan, Sri Lanka and Thailand.^[32]

On 27 April 2008, Khan's brainchild, a technical college in the Mianwali District called Namal College, was inaugurated. Namal College was built by the Mianwali Development Trust (MDT), as chaired by Khan, and was made an associate college of the University of Bradford (of which Khan is Chancellor) in December 2005.^[33] Currently, Khan is building another cancer hospital in Karachi, using his successful Lahore institution as a model. While in London, he also works with the Lord’s Taverners, a cricket charity.^[4]

Political work[link]

Imran Khan, Chairman, Pakistan Tehreek-e-Insaf in World Economic Forum

In 1996, Khan founded a political party, Pakistan Tehreek-e-Insaf (PTI), which emphasized on anti-corruption policies.^[8][34] The newly formed party was unable to win a seat during the 1997 Pakistani general election.^[35] Khan supported General Pervez Musharraf's military coup in 1999,^[36] believing Musharraf would "end corruption, clear out the political mafias".^[37] According to Khan, he was Musharraf's choice of prime minister in 2002 but turned down the offer.^[38] The 2002 Pakistani general election were held in October across 272 constituencies. Khan anticipated doing well in the elections and was prepared to form a coalition if his party did not get a majority of the vote.^[39] He was elected from the NA-71 constituency of Mianwali and being the only party member to have secured a seat, PTI won only 0.8% of the popular vote. Khan, who was sworn in as an MP on 16 November,^[40] remained part of the Standing Committees on Kashmir and Public Accounts, and expressed legislative interest in Foreign Affairs, Education and Justice.^[41]

On 6 May 2005, Khan became one of the first Muslim figures to criticise a 300-word Newsweek story about the alleged desecration of the Qur'an in a U.S. military prison at the Guantánamo Bay Naval Base in Cuba. Khan held a press conference to denounce the article and demanded that Gen. Pervez Musharraf secure an apology from the American president George W. Bush for the incident.^[42]. In June 2007, the federal Parliamentary Affairs Minister Dr. Sher Afghan Khan Niazi and the Muttahida Qaumi Movement (MQM) party filed separate ineligibility references against Khan, asking for his disqualification as member of the National Assembly on grounds of immorality. Both references, filed on the basis of articles 62 and 63 of the Constitution of Pakistan, were rejected on 5 September.^[43]

On 2 October 2007, as part of the All Parties Democratic Movement, Khan joined 85 other MPs to resign from Parliament in protest of the Presidential election scheduled for 6 October, which General Musharraf was contesting without resigning as army chief.^[5] On 3 November 2007, Khan was put under house arrest at his father's home hours after President Musharraf declared a state of emergency in Pakistan. Khan had demanded the death penalty for Musharraf after the imposition of emergency rule, which he equated to "committing treason". The next day, on 4 November, Khan escaped and went into peripatetic hiding.^[44] He eventually came out of hiding on 14 November to join a student protest at the University of the Punjab.^[45] At the rally, Khan was captured by students from the Jamaat-i-Islami political party, who claimed that Khan was an uninvited nuisance at the rally, and they handed him over to the police, who charged him under the Anti-terrorism act for allegedly inciting people to pick up arms, calling for civil disobedience, and for spreading hatred.^[46].

On 30 October, 2011, Imran Khan changed the political picture of the country by addressing more than 100,000 supporters, challenging the policies of the current government, calling this new change a "tsunami" against the ruling parties,^[47] followed by another successful public gathering in Karachi on 25 December, 2011.^[48] Since then Imran Khan has become a real threat for the current ruling parties and future political prospect in Pakistan. According to International Republican Institute (IRI)'s survey, Imran Khan’s Pakistan Tehreek-e-Insaf (PTI) tops the list of popular parties in Pakistan both at the national as well as provincial level, leaving Pakistan Muslim League-Nawaz (PML-N) and Pakistan Peopleís Party (PPP) behind.^[49]

Ideology[link]

Khan's proclaimed political platform and declarations include: Islamic values, to which he rededicated himself in the 1990s; liberal economics, with the promise of deregulating the economy and creating a welfare state; decreased bureaucracy and the implementation of anti-corruption laws, to create and ensure a clean government; the establishment of an independent judiciary; overhaul of the country's police system; and an anti-militant vision for a democratic Pakistan.^[18][26][50]

Khan told Britain's Daily Telegraph, "I want Pakistan to be a welfare state and a genuine democracy with a rule of law and an independent judiciary."^[18] Other ideas he has presented include a requirement of all students to spend a year after graduation teaching in the countryside and cutting down the over-staffed bureaucracy in order to send them to teach too.^[51] "We need decentralisation, empowering people at the grass roots," he has said.^[52]

Criticism[link]

Khan had a child out of wedlock with Ana-Luisa White (Sita White).^[53] This was confirmed by a judgement of paternity rendered by a Superior Court of the State of California for the county of Los Angeles in favour of White^[54] wherein it was held that Khan was the father of a female child born on June 15, 1992.^{[55][56][not in citation given]} Khan did not challenge that judgement and in 2004 accepted the child as his daughter. He and his wife Jemima became the girls guardians.^{[57][58] [59] [60] [61]}

During the 1970s and 1980s, Khan became known as a socialite due to his "non-stop partying" at London nightclubs such as Annabel's and Tramp, though he claims to have hated English pubs and to never drink alcohol.^{[4][8][26][42]} He gained notoriety in London gossip columns for romancing young debutantes such as Susannah Constantine, Lady Liza Campbell and the artist Emma Sergeant.^[8]

Khan is often dismissed as a political lightweight^[45] and a celebrity outsider in Pakistan,^[19] where national newspapers also refer to him as a "spoiler politician".^[62] The Muttahida Qaumi Movement, has asserted that Khan is "a sick person who has been a total failure in politics and is alive just because of the media coverage".^[63] Political observers say the crowds he draws are attracted by his cricketing celebrity, and the public has been reported to view him as a figure of entertainment rather than a serious political authority.^[51]

Declan Walsh in The Guardian newspaper in England in 2005 described Khan as a "miserable politician," observing that, "Khan's ideas and affiliations since entering politics in 1996 have swerved and skidded like a rickshaw in a rainshower... He preaches democracy one day but gives a vote to reactionary mullahs the next."^[64] The charge constantly raised against Khan is that of hypocrisy and opportunism, including what has been called his life's "playboy to puritan U-turn."^[19] Political commentator Najam Sethi, stated that, "A lot of the Imran Khan story is about backtracking on a lot of things he said earlier, which is why this doesn’t inspire people."^[19]. He is also criticized for being a puppet of Pakistan's 'establishment'.^[65]

Awards and honours[link]

Khan in Germany

• Khan is featured in the University of Oxford's Hall of Fame and has been an honorary fellow of Oxford's Keble College.^[31]
• In 1976 as well as 1980, Khan was awarded The Cricket Society Wetherall Award for being the leading all-rounder in English first-class cricket.
• In 1983, he was also named Wisden Cricketer of the Year
• In 1983, he had received the President’s Pride of Performance Award
• In 1985, Sussex Cricket Society Player of the Year
• In 1990, Indian Cricket Cricketer of the Year^[14]
• In 1992, Khan was given Pakistan's civil award, the Hilal-i-Imtiaz
• On 8 July 2004, Khan was awarded the Lifetime Achievement Award at the 2004 Asian Jewel Awards in London, for "acting as a figurehead for many international charities and working passionately and extensively in fund-raising activities.^[66]
• On 7 December 2005, Khan was appointed the fifth Chancellor of the University of Bradford, where he is also a patron of the Born in Bradford research project.
• On 13 December 2007, Khan received the Humanitarian Award at the Asian Sports Awards in Kuala Lumpur for his efforts in setting up the first cancer hospital in Pakistan.^[67]
• On 5 July 2008, he was one of several veteran Asian cricketers presented special silver jubilee awards at the inaugural Asian cricket Council (ACC) award ceremony in Karachi.^[68]
• In 2009, at International Cricket Council's centennial year celebration, Khan was one of fifty-five cricketers inducted into the ICC Hall of Fame.^[69]
• In 2011 he was given Jinnah award.

Writings by Khan[link]

Khan has published six works of non-fiction, including an autobiography co-written with Patrick Murphy. He periodically writes editorials on cricket and Pakistani politics in several leading Pakistani and British newspapers. It was revealed in 2008 that Khan's second book, Indus Journey: A Personal View of Pakistan, had required heavy editing from the publisher. The publisher Jeremy Lewis revealed in a memoir that when he asked Khan to show his writing for publication, "he handed me a leatherbound notebook or diary containing a few jottings and autobiographical snippets. It took me, at most, five minutes to read them; and that, it soon became apparent, was all we had to go on."^[70]

Books

• Khan, Imran (1989). Imran Khan's cricket skills. London : Golden Press in association with Hamlyn. ISBN 0-600-56349-9. 
• Khan, Imran & Murphy, Patrick (1983). Imran: The autobiography of Imran Khan. Pelham Books. ISBN 0-7207-1489-3. 
• Khan, Imran (1991). Indus Journey: A Personal View of Pakistan. Chatto & Windus. ISBN 0-7011-3527-1. 
• Khan, Imran (1992). All Round View. Mandarin. ISBN 0-7493-1499-0. 
• Khan, Imran (1993). Warrior Race: A Journey Through the Land of the Tribal Pathans. Chatto Windus. ISBN 0-7011-3890-4. 
• Khan, Imran (2011). Pakistan: A Personal History. Bantam Press. ISBN 0-593-06774-6. 

Articles

• Guardian comments, political and cricket commentary by Khan
• Telegraph columns, sports articles penned by Khan from 2000 to present
• We must address the root causes of this terror, Khan's editorial in the Independent following the 11 September attacks
• Benazir Bhutto has only herself to blame, Khan's 2007 editorial on Bhutto's return to Pakistan

In popular culture[link]

After the permission from him, Kaptaan is a biographical film about him.

References[link]

Further reading[link]

• Tennant, Evo (1996). Imran Khan. Trafalgar Square. ISBN 0-575-05936-2. 

External links[link]

• Player profile: Imran Khan from ESPNcricinfo
• Player profile: Imran Khan from CricketArchive
• Player Profile: Imran Khan from Yahoo! Cricket
• Pakistan Tehreek-e-Insaf, Khan's political party
• Chancellor: Imran Khan at the University of Bradford
• Column archive at The Guardian
• Imran Khan on Charlie Rose
• Imran Khan at the Internet Movie Database
• Works by or about Imran Khan in libraries (WorldCat catalog)
• Imran Khan collected news and commentary at The New York Times
• PTI to move SC against speaker's decision today, says Imran Khan, The News International, May 28, 2012]
• PTI will form next government, says Imran Khan, Geo News Pakistan]

Articles

• The NS Interview: Imran Khan Mehdi Hasan, New Statesman, 20 August 2010
• Imran Khan's revolution, Murtaza Razvi, Dawn, 27 April 2011
• Imran Khan: Pakistan's next leader?, Frost Over the World, Aljazeera English, 10 December 2011
• Thousands rally for Pakistan's Imran Khan, Aljazeera English, 25 December 2011
• Hundreds of thousands gather at PTI rally in Karachi, Dawn, 25 December 2011

• Imran stands out, Adiah AfrazThe News International, 27 May 2012

• The Imran that we know Shafqat Mahmood, The News International, 27 May 2012

v t e Pakistan squad – 1975 Cricket World Cup 1 Asif Iqbal (c) 2 Asif Masood 3 Imran Khan 4 Javed Miandad 5 Majid Khan 6 Mushtaq Mohammad 7 Naseer Malik 8 Pervez Mir 9 Sadiq Mohammad 10 Sarfraz Nawaz 11 Wasim Bari (wk) 12 Wasim Raja 13 Zaheer Abbas

v t e Pakistan squad – 1979 Cricket World Cup Semi-Finalists 1 Asif Iqbal (c) 2 Haroon Rashid 3 Imran Khan 4 Javed Miandad 5 Majid Khan 6 Mudassar Nazar 7 Sadiq Mohammad 8 Sarfraz Nawaz 9 Sikander Bakht 10 Wasim Bari (wk) 11 Wasim Raja 12 Zaheer Abbas

v t e Pakistan squad – 1983 Cricket World Cup Semi-Finalists 1 Imran Khan (c) 2 Abdul Qadir 3 Ijaz Faqih 4 Javed Miandad 5 Mansoor Akhtar 6 Mohsin Khan 7 Mudassar Nazar 8 Rashid Khan 9 Sarfraz Nawaz 10 Shahid Mahboob 11 Tahir Naqqash 12 Wasim Bari (wk) 13 Wasim Raja 14 Zaheer Abbas

v t e Pakistan squad – 1987 Cricket World Cup Semi-Finalists 1 Imran Khan (c) 2 Abdul Qadir 3 Ijaz Ahmed 4 Javed Miandad 5 Mansoor Akhtar 6 Manzoor Elahi 7 Mudassar Nazar 8 Rameez Raja 9 Saleem Jaffar 10 Saleem Malik 11 Saleem Yousuf (wk) 12 Shoaib Mohammad 13 Tauseef Ahmed 14 Wasim Akram

v t e Pakistan squad – 1992 Cricket World Cup (1st title) 1 Imran Khan (c) 2 Aamer Sohail 3 Aaqib Javed 4 Ijaz Ahmed 5 Inzamam-ul-Haq 6 Iqbal Sikander 7 Javed Miandad 8 Moin Khan (wk) 9 Mushtaq Ahmed 10 Rameez Raja 11 Saleem Malik 12 Wasim Akram 13 Wasim Haider 14 Zahid Fazal