IIT video lectures on Active Filter Design by Dr. Shanthi Pavan (IIT Madras)

Video Lecture Series from IIT Professors :

 Active Filter Design by Dr. Shanthi Pavan Sir

Dr.Shanthi Pavan obtained the B.Tech degree in Electronics and Communication Engg from the Indian Institute of Technology, Madras in 1995 and the M.S and Sc.D degrees from Columbia University, New York in 1997 and 1999 respectively. From 1997 to 2000, he was with Texas Instruments in Warren, New Jersey, where he worked on high speed analog filters and data converters. From 2000 to June 2002, he worked on microwave ICs for data communication at Bigbear Networks in Sunnyvale, California. Since July 2002, he has been with the Indian Institute of Technology-Madras, where he is now a Professor of Electrical Engineering. His research interests are in the areas of high speed analog circuit design and signal processing.


Dr.Pavan is the recipient of the IEEE Circuits and Systems Society Darlington Best Paper Award (2009), the Swarnajayanthi Fellowship (2010, from the Government of India) , the Young Faculty Recognition Award from IIT Madras (2009, for excellence in teaching) , the Technomentor Award from the India Semiconductor Association (2010) and the Young Engineer Award from the Indian National Academy of Engineering (2006). He is an Associate Editor of the IEEE Transactions on Circuits and Systems: Part I - Regular Papers, and earlier served on the editorial board of the IEEE Transactions on Circuits and Systems Part II - Express Briefs from 2006-2007.

Lecture1 - Course overview and introduction.

Lecture2 - The Butterworth approximation

Lecture3 - The Chebyshev approximation

Lecture4 - The Chebyshev approximation (contd)

Lecture 5 - The Chebyshev approximation (contd), the Inverse Chebyshev approximation

Lecture6 - The Inverse Chebyshev approximation (contd).

Lecture7 - Synthesis of doubly terminated all-pole LC ladders filters (long lecture).

Lecture8 - Synthesis of doubly terminated LC ladders (contd).

Lecture9 - Synthesis of doubly terminated LC ladders with finite zeros oftransmission.

Lecture10 - Network sensitivity - low sensitivity of doubly terminated ladders (onlypart of the lecture recorded due to power failure).

Lecture11 - Introduction to frequency transformations.

Lecture12 - Frequency (reactance) transformations (contd) - properties of the drivingimpedance of lossless LC networks- Tellegen's theorem and positive realfunctions.

Lecture13 - Driving point impedance of LC networks (contd), Low Pass-to-Low Pass, LowPass-to-Band Pass, Low Pass-to-High Pass and Low Pass-to-Band Stop transformations(long lecture).

Lecture14 - The Richard's Transformation, RC-CR transformation (long lecture).

Lecture15 - Emulation of an inductor with a capacitor and controlled sources, thegyrator, a second order transconductor capacitor filter.

Lecture16 - Cascade of biquads realization of high order low pass filters, equivalenceof the parallel RLC and series RLC circuits with their Gm-C counterparts.

Lecture17 - The idea of Dynamic Range in active filters - impedance scaling and itseffect on dynamic range (long lecture).

Lecture18 - Introduction to noise in electrical networks.

Lecture19 - Introduction to noise in electrical networks (contd), the idea of nodescaling. (long lecture)

Lecture20 - Dynamic range scaling in active filters.

Lecture21 - Biquad Ordering.

Lecture22 - Active Ladder Emulation / Leapfrog Filters, Effect of Transconductornonidelaities (parasitic capacitance/output resistance).

Lecture23 - Effect of Transconductor Nonidealities (contd) - parasitic poles.

Lecture24 - Viewing the Gm-C biquad as a Double Integrator Loop, Revisiting the Effectof Finite Gain of the Transconductors.

Lecture25 - Single-ended Versus Differential Filters, Introducing theDifferential-pair Based Fully Differential Transconductor, the Need forCommon-mode Feedback (long lecture).

Lecture26 - Common-mode Feedback (continued). 

Lecture27 - Common-mode Feedback (continued), examples of Common-mode Detectors.

Lecture28 - Stability of the Common-mode Feedback Loop (long lecture).

Lecture29 - Common-mode Positive Feedback in Gyrators.

Lecture30 - Common-mode Positive Feedback in Gyrators (contd), Noise in theDifferential Pair.

Lecture31 - Noise in the Differential Pair (contd), Linearity of the DifferentialPair, Cascoding to Improve Output Impedance (long lecture).

Lecture32 - Noise in Cascodes, Layout Considerations and Multi-finger Transistors.

Lecture33 - Linearizing the Differential Pair, Resistive Degeneration.

Lecture34 - Noise in Degenerated Transconductors, The Folded Cascode and NoiseAnalysis (long lecture).

Lecture35 - Stabilizing filter bandwidth over process and temperature - the resistorservo loop, master-slave loops.

Lecture36 - Turning the filter into a VCO to estimate center frequency, example of apractical precision fixed-gm bias circuit.

Lecture37 - Introduction to accurate measurement and characterization techniques foractive filters.

Lecture38 - Introduction to Active-RC filters.

 

Lecture39 - Active-RC filters (contd), the use of an OTA instead of an opamp, swingand noise considerations, single stage OTAs (long lecture).

 

Lecture40 - Multistage OTAs for use in CMOS Active-RC filters.

Lecture41 - The Miller compensated opamp in active-RC filters, noise considerations,noise in active-RC filters (long lecture, but latter half not recorded due topower failure) .

Lecture42 - Distortion and Intermodulation in filters, miscellaneous discussion onfixed gm-bias circuits (Last Lecture).