Lecture 11 of 60Negative feedback systems and stability
Phase margin
Dr. Nagendra Krishnapura · IIT Madras
Credits and licence
- From
- Analog IC Design, IIT Madras (at NPTEL)
- Licence
- CC BY-NC-SA, as NPTEL states it. Non-commercial use only.
- Attribution
- NPTEL states: "Distributed under Creative Commons Attribution-ShareAlike / CC BY - NC - SA", beside a BY-NC-SA badge.
- Who can watch
- Teens profiles and older. How courses are placed
All the lectures
- Course introduction; Negative feedback control
- Negative feedback amplifier
- Step response, sinusoidal steady state response
- Loop gain and unity loop gain frequency; Opamp
- Opamp realization using controlled sources; Delay in the loop
- Negative feedback amplifier with ideal delay-small delays
- Negative feedback amplifier with ideal delay-large delays
- Negative feedback amplifier with parasitic poles and zeros
- Negative feedback amplifier with parasitic poles and zeros; Nyquist criterion
- Nyquist criterion; Phase margin
- Phase margin
- Single stage opamp realization
- Two stage miller compensated opamp
- Two stage miller compensated opamp
- Two and three stage miller compensated opamps; Feedforward compensated opamp
- Feedforward compensated opamp
- Feedforward compensated opamp
- Feedforward compensated opamp; typical opamp data sheet
- Opamp offset and CMRR; Transimpedance amplifier using an opamp
- Components available in a CMOS process
- MOS transistors-basics
- MOS transistors-parasitics, mismatch
- MOS transistors-mismatch, speed
- Noise in resistors
- Noise in MOS transistors; Input and output referred noise
- Noise scaling; Basic amplifier stages-Common source, common gate
- Basic amplifier stages-Common drain; Frequency response of amplifiers
- Common source amplifier frequency response; Differential amplifier
- Differential and common mode half circuits; Differential pair with active load
- Differential pair with current mirror load
- Single stage opamp characteristics
- Opamp with single and dual supplies; Single stage opamp tradeoffs
- Telescopic cascode opamp
- Telescopic cascode opamp; Folded cascode opamp
- Folded cascode opamp
- Two stage opamp
- Two stage opamp; Three stage and triple cascode opamps
- Common mode rejection ratio; Example
- Fully differential circuits
- Fully differential single stage opamp
- Common mode feedback
- Fully differential single stage opamp
- Fully differential two stage opamp; Fully differential versus pseudo-differential
- Circuit simulators and analyses
- Phase locked loop as frequency multiplier
- Phase domain model
- Type I PLL transfer function and reference feedthrough
- Type II PLL
- Type II PLL transfer functions; Implementation
- Type II PLL-extra poles; Random noise in a PLL
- Oscillator phase noise
- PLL phase noise; LC and ring Oscillators
- Generating PTAT and constant MOS gm bias currents
- Reducing supply sensitivity; Bandgap voltage reference
- Fractional bandgap reference; Low dropout regulators
- Low dropout regulators; Continuous-time active filters
- Continuous-time active filters
- Continuous-time active filters
- Discrete-time active filters
- Transistor sizing in practice; Course summary