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Homework 5

1)  (80 points) Design the schematic for a two-stage differential operational amplifier with 40dB gain, Unity gain BW of 2MHz, with greater than 70 degrees phase margin, slew rate 5 V/us  for a 20pF load. Show the simulations results for all design parameters using ac analysis and transient analysis. Check common mode range using a transient simulation.

Specs: dc Gain = 40dB, Phase Margin > 70 degrees Slew Rate = 5V/us with 20 pF load VDD = 1.2 V Input DC Bias 0.6 V, Unity Gain BW = 2MHz

2) (20 Points) Check a 50mV step response with 20pF load in closed loop (source follower)

using a transient simulation and see if amplifier is under, over or critically damped. What is the settling time for the step response.

3) (20 Points) Re-check problem 1 simulations at temperatures 0, 75 degrees C Junction Temp and note changes