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Design >> Mixed-Signal Design >> opamp'problem in the sc network
https://designers-guide.org/forum/YaBB.pl?num=1081388363

Message started by alice_alice_nc on Apr 7^th, 2004, 6:39pm

Title: opamp'problem in the sc network
Post by alice_alice_nc on Apr 7^th, 2004, 6:39pm

KEN:
I want to ask you another question about that
there is DC problem in the opamp enbeded in the sc network , the output DC of the opamp is 600m or so ,so it affected the ac characteristic .
How I can solve the problem of the output dc ?
If I used the big capacitor ,I can remove the 600mV ' dc, but I can not used so large capacitor.

Title: Re: opamp'problem in the sc network
Post by Mighty Mouse on Apr 7^th, 2004, 8:15pm

Alice,
What is causing the 600mV DC offset?

- MM -

Title: Re: opamp'problem in the sc network
Post by alice_alice_nc on Apr 8^th, 2004, 12:57am

The architecture of the opamp is a one stage folded cascoded opamp ,pmos input , and the output is from the four transistor,so there is 600mv dc problem .