Interview Question

Analog & Mixed-Signal IC Design Engineer Interview San Diego, CA

How to make sure the 2-stage opamp is stable? How does the

  compensation work?
Answer

Interview Answer

5 Answers

8

Use compensation capacitor. Look up pole splitting which uses Miller effect on the capacitor.

Interview Candidate on Jun 26, 2012
0

By constructing current mirror circuit using op-amp 741 through compensation resistor at the feedback side. Finally the input and output of the op-amp gets compensated.

sowndharya k on Jun 29, 2012
1

Using Miller compensation. A compensation capacitor across the 2nd stage to create pole splitting. A series resistor to the cap might be needed to solve the rhp zero problem

Karthik Tripurari on Jul 31, 2013
0

Using compensation capacitor, which makes the low frequency pole's frequency become lower and high frequency pole's frequency higher, so OPmap is more stable.

Anonymous on Nov 26, 2014
0

Using compensation network including capacitor and resistor and monitoring the phase margin and gain margin as well.

Anonymous on Jan 11, 2015

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