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How to do DC analysis of open loop OTA

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vhdl00

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dc analysis of OTA

Hi all,
I am trying to do dc analysis of open loop OTA. at the beginning I was doing dc differential sweep to make sure all the device working in saturation region, after I has been told to use CMFB to set up the operation point, I am kind of confused: how to choose Vcm , do we have to choose it randomly? or we have to do dc common mode sweep to find it ?

Thanks.
 

Re: dc analysis of OTA

Vcm is chosen as half way between VDD and VSS.
 

dc analysis of OTA

In gray's book, the last chapter discuss how to design full differential OPAM. I think it will help you to chose the vcm of the OTA.
 

dc analysis of OTA

at the middle point of half swing
 

Re: dc analysis of OTA

Start with the middle point of the swing and sweep.Because you can't match well the size of pmos and nmos.
 

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