AFD02 - The Butterworth approximation

• published: 12 Mar 2012
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video lectures from iit professors.... not available in NPTEL..... video Lectures on "Active Filter Design" by Dr.Shanthi Pavan , IIT Madras for more videos .... www.satishkashyap.com for free ebooks.....www.ebook29.blogspot.com Lecture 1 - Course overview and introduction. Lecture 2 - The Butterworth approximation Lecture 3 - The Chebyshev approximation Lecture 4 - The Chebyshev approximation (contd) Lecture 5 - The Chebyshev approximation (contd), the Inverse Chebyshev approximation Lecture 6 - The Inverse Chebyshev approximation (contd). Lecture 7 - Synthesis of doubly terminated all-pole LC ladders filters Lecture 8 - Synthesis of doubly terminated LC ladders (contd). Lecture 9 - Synthesis of doubly terminated LC ladders with finite zeros of transmission. Lecture 10 - Network sensitivity - low sensitivity of doubly terminated ladders Lecture 11 - Introduction to frequency transformations. Lecture 12 - Frequency (reactance) transformations (contd) - properties of the driving impedance of lossless LC networks- Tellegen's theorem and positive real functions. Lecture 13 - Driving point impedance of LC networks (contd), Low Pass-to-Low Pass, Low Pass-to-Band Pass, Low Pass-to-High Pass and Low Pass-to-Band Stop transformations Lecture 14 - The Richard's Transformation, RC-CR transformation Lecture 15 - Emulation of an inductor with a capacitor and controlled sources, the gyrator, a second order transconductor capacitor filter. Lecture 16 - Cascade of biquads realization of high order low pass filters, equivalence of the parallel RLC and series RLC circuits with their Gm-C counterparts. Lecture 17 - The idea of Dynamic Range in active filters - impedance scaling and its effect on dynamic range Lecture 18 - Introduction to noise in electrical networks. Lecture 19 - Introduction to noise in electrical networks (contd), the idea of node scaling. Lecture 20 - Dynamic range scaling in active filters. Lecture 21 - Biquad Ordering. Lecture 22 - Active Ladder Emulation / Leapfrog Filters, Effect of Transconductor nonidelaities (parasitic capacitance/output resistance). Lecture 23 - Effect of Transconductor Nonidealities (contd) - parasitic poles. Lecture 24 - Viewing the Gm-C biquad as a Double Integrator Loop, Revisiting the Effect of Finite Gain of the Transconductors. Lecture 25 - Single-ended Versus Differential Filters, Introducing the Differential-pair Based Fully Differential Transconductor, the Need for Common-mode Feedback Lecture 26 - Common-mode Feedback (continued). Lecture 27 - Common-mode Feedback (continued), examples of Common-mode Detectors. Lecture 28 - Stability of the Common-mode Feedback Loop Lecture 29 - Common-mode Positive Feedback in Gyrators. Lecture 30 - Common-mode Positive Feedback in Gyrators (contd), Noise in the Differential Pair. Lecture 31 - Noise in the Differential Pair (contd), Linearity of the Differential Pair, Cascoding to Improve Output Impedance Lecture 32 - Noise in Cascodes, Layout Considerations and Multi-finger Transistors. Lecture 33 - Linearizing the Differential Pair, Resistive Degeneration. Lecture 34 - Noise in Degenerated Transconductors, The Folded Cascode and Noise Analysis Lecture 35 - Stabilizing filter bandwidth over process and temperature - the resistor servo loop, master-slave loops. Lecture 36 - Turning the filter into a VCO to estimate center frequency, example of a practical precision fixed-gm bias circuit. Lecture 37 - Introduction to accurate measurement and characterization techniques for active filters. Lecture 38 - Introduction to Active-RC filters. Lecture 39 - Active-RC filters (contd), the use of an OTA instead of an opamp, swing and noise considerations, single stage OTAs Lecture 40 - Multistage OTAs for use in CMOS Active-RC filters. Lecture 41 - The Miller compensated opamp in active-RC filters, noise considerations, noise in active-RC filters . Lecture 42 - Distortion and Intermodulation in filters, miscellaneous discussion on fixed gm-bias circuits