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RHP zero cancellation in miller compensated opamp

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big_fudge98

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Hi all,

I have designed a subtheshold opamp with UGB = 20 kHz. I calculated the RHP zero to be at 250 kHz. Should I go for RHP zero cancellation by adding a resistance before the compensation capacitor?

In general, when do we go for RHP cancellation?

Thanks.
 

So if the phase margin is greater than 60 without RHP zero cancellation, I am safe, correct?
 

If required for stability of the intended feedback circuit.

- - - Updated - - -

Sufficient phase margin and only single crossing of the 0 dB loop gain line.
 
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