1. Last time Reviewed 4 devices in CMOS Transistors: main device
Caps, resistors, diodes, transistors
Transistors: main device
Regions of operation: in terms of VGS
Equations in each region: ID in sat and triode
Small signal model, DC: gm, gmb, gds
Small signal model, HF: Cgs, Cgd, Cdb
Key figures: A0=gm/gds, wT=gm/Cgs

2. Goals Use these devices to build useful circuits
Op amps, with components:
Simple amplifiers: CS, CD, CG
Diff pairs
Current mirrors
Biasing circuits
Data converters
References
Comparators
Switches
Resistor/capacitor/current source arrays

3. Analysis vs Design Analysis Design
Given a circuit with fixed sizes and biases
Find circuit electrical properties
You get unique answers
Design
Given desired electrical properties
Come up with a circuit to achieve your goal
Verify that properyties are achieved
Non-unique solutions

4. Circuit Design Circuit topology or architecture selection
Sizing and biasing
Simulation
Tuning sizes and biases
Verification
Fabrication
Testing

5. Circuit Analysis Foundation to design Accumulation of knowledge
Collection of various topologies for various purposes
Knowing what’s possible and what’s not possible
Knowing how size/bias affect properties

6. Typical Analysis Tasks
Large signal analysis: DC
Nonlinear equation
Balance currents and voltages (KCL, KVL)
Finding DC operating points
Checking VDS of all transistors
Checking if all transistors are in desired operating region
Checking voltage swing rooms at key node voltages

7. Typical Analysis Tasks
Large signal analysis: Transient
Large step response
Check slew rate limitation
Check settling time
Check large signal sine wave response
Check distortion

8. Typical Analysis Tasks
Small signal analysis: DC
Computing gm, gds,… for transistors
Computing DC gain
Computing input impedance
Computing output impedance
Offset
DC CMRR
DC PSRR

9. Typical Analysis Tasks
Small signal analysis: AC
Computing all capacitance at all nodes
Computing s-domain transfer function
Computing Bode plot
Computing poles/zeros
Gain bandwidth product
Frequency dependent CMRR
Frequency dependent PSRR

10. Typical Analysis Tasks
Small signal analysis: transient
Computing small step responses
Overshoot, rise time, settling time
Check ringing, oscillation
Check small sine responses

11. Current mirror
Chapter 3 Figure 01

12. Common source amplifier
Chapter 3 Figure 04

13. Common drain or source follower
Chapter 3 Figure 06

14. Common gate
Chapter 3 Figure 09