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op amp simulation question (Read 3274 times)
liletian
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Re: op amp simulation question
Reply #15 - Apr 29th, 2009, 7:09am  
buddypoor wrote on Apr 28th, 2009, 11:28pm:
liletian wrote on Apr 28th, 2009, 1:35pm:
 HI
 Thanks for answering, you might be right, I will think about it more. I do know there is no DC feedback, but it seems is necessary for a charge pump of PLL, not sure about it yet. Can you comment more on the DC feedback and why it should not working for any pratical circuits?
 Thanks a lot



Each opamp needs dc feedback to fix the bias point.
Without dc feedback the offset drives the output in saturation. [/quote]
I knew it, but in this application, I can not add a DC feedthrough, any suggestions?
 Thanks
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