gain boosted opamp - bandwidth Vs settling

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jebaspaul

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Hi all,


upto my knowledge;

pole-zero doublet will occur when;
ugb of gain boosting opamp > ugb of main opamp

But in transient response we need;

ugb of gain boosting opamp > ugb of main opamp

but, since our signal swing at that node is less. so settling needs lesser ugb.



give comments on it...:smile:
 

Slew rate limiting takes precedence over unity GBW on large signals. You can provide open loop pre-amp gain of Op Amp into power Amp and provide DC negative feedback to pre-amp to get a 1st order response at loop bandwidth. Ensure pre-amp has more than adequate BW to give desired rise time with overall loop gain..
 

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