AFD37 - Introduction to accurate measurement and characterization techniques for active filters.
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video Lectures on "Active Filter Design" by Dr.Shanthi Pavan , IIT Madras
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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
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
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
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