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Re: how does the feedback affect the circuit noise performan
I believe feedback system will reshape your noise. In fact, PLL is a feedback system which changes your input noise.
post-layout simulations on spectre
You can use either config or simply insert your extracted view before your schematic view in your "analog enviroment" settings, and then run your simulation as before.
Cheers!
Re: a left zero before the second pole, is the system stable
Left zero helps your circuit to be stable.
Be careful of your phase margin. It is not big enough!
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