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Qualcomm Analog & Mixed-Signal IC Design Engineer Interview Question

I interviewed in San Diego, CA and was asked:
"How to make sure the 2-stage opamp is stable? How does the compensation work?"
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Part of a Analog & Mixed-Signal IC Design Engineer Interview Review - one of 799 Qualcomm Interview Reviews

Answers & Comments

of 4
Use compensation capacitor. Look up pole splitting which uses Miller effect on the capacitor.
- Interview Candidate on Jun 26, 2012 Flag Response
of 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 Flag Response
of 0
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 Flag Response

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