TheCMOSopampof Fig. 13.1 is fabricated in a process for which V1An = 25 V/μm and/ V1 Ap /= 20 V/μm. Find A1, A2 and Av if all devices are 0.3 μm long, Q1 and Q2 are operated at overdrive voltages of 0.15-V magnitude, andQ6 is operated at VOV =0.2 V.
| Transistor |
Q1 |
Q2 |
Q3 |
Q4 |
Q5 |
Q6 |
Q7 |
Q8 |
| W/L() |
36/0.3 |
36/0.3 |
6/0.3 |
6/0.3 |
30/0.3 |
w/0.3 |
45/0.3 |
6/0.3 |
Also, determine the op-amp output resistance obtained when the second stage is biased at 0.3 mA. What do you expect the output resistance of a unity-gain voltage amplifier to be, using this op amp?
