ECE 323 Homework 7 Due Date: Fri. Dec 2.
Problems from Microelectronic Circuits (5th Edition):
8.76 (use 45º phase margin)
8.77
13.13
13.21 part (b) only
A) Consider the Bode plot for the open loop response of the OPA227 operational
amplifier shown here and answer the following question:
a) Approximately what is the frequency of the dominant pole?
b) What is the open-loop DC gain of the amplifier?
c) Would this amplifier be stable in a unity-gain configuration?
d) Approximate the position of the higher frequency poles.
e) What is the minimum closed loop gain at which this amplifier would be stable?
f) If the amplifier is configured in a unity-gain configuration, what is the phase margin?
g) If the amplifier is configured in a unity-gain configuration, what is the gain margin?
h) If the amplifier is configured with a feedback loop so that the closed loop gain is 100,
what is the closed loop bandwidth?
i) What is the gain-bandwidth product for this amplifier?