1. VDD
VDD
VDD M2 M2
Iref
vo+
vo- CL CL M1 M1
VoQ
Voc
vin-
vin+
– +
2*M1

2. VDD VDD VDD M2 M2 Iref vo+ vo- CL CL M1 M1 VoQ Voc vin- vin+ =VoQ 2*M1
– +
2*M1

3. VDD VDD VDD M4 M4 M3 M3 vo+ vo- CL CL M2 M2 10 M1 M1 VoQ Voc vin- vin+
– +
2*M1

4. VDD VDD VDD M4 M4 M3 M3 vo+ vo- VDD CL CL M2 M2 Iref Vb2 Vb2 M1 M1 VoQ
Voc
vin-
vin+
=VoQ Vs
– + Vs
2*M1

5. Self biasing VDD VDD M4 M4 VDD M3 M3 Vb2 VDD vo CL M2 M2 Vs Vb2 M1 M1
vin+
vin- Vs

6. VDD
VDD
VDD M2 vs
Iref vo
vin-
= vo
vin+= voQ CL vb vs vb cc M1
vin2

7. - + + -

8. Buffer: b=1
Resistive feedback: b=R1/(R1+R2)

9. Remember: phase margin is defined on the loop TF

11. Under damped
Critically dampled
Over damped
For the same resources, under damped system is faster and therefore is desired.

12. Overshoot = (peak – final)/final *100%
For under damped system that does not have too much overshoot: PM in deg + O.S.  70.
For example: 55 deg PM will have about 15% O.S.
Damping ratio z  PM / 100
Settling time  - ln(tolerance)/(wtz)