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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> Remove the compensation cap, the opamp still stable? https://designers-guide.org/forum/YaBB.pl?num=1467761832 Message started by ludake on Jul 5th, 2016, 4:37pm |
Title: Remove the compensation cap, the opamp still stable? Post by ludake on Jul 5th, 2016, 4:37pm I built a regular 2-stage opamp with one compensation cap..... when i remove this cap, i see in the ac simulation that the phase margin is not enough, but in the transient simulation, i can't see the opamp is oscillating ? what't happening??? [img][/img] |
Title: Re: Remove the compensation cap, the opamp still stable? Post by buddypoor on Jul 6th, 2016, 12:52am ludake wrote on Jul 5th, 2016, 4:37pm:
Oscillation will occur in case of a closed feedback loop only. Did you apply feedback during TRAN simulations? |
Title: Re: Remove the compensation cap, the opamp still stable? Post by loose-electron on Jul 6th, 2016, 7:55pm That is not an Op-amp, that is an OTA. That said buddy is right about the feedback |
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