Problem with DC value in fully opamp simulation

[shanmei]

when I simulate a fully opm with cmfb, the DC value dose not equal to the trans value, for example, when the DC value show 2.3v for a line, but the trans value equal to 3 , anyone knwo the reason?
Pls! thanks!

 

[pfd001]

DC value problem?

which kind of cmfb do you use? SC or continuous

 

[benever]

Re: DC value problem?

when I simulate a fully opm with cmfb, the DC value dose not equal to the trans value, for example, when the DC value show 2.3v for a line, but the trans value equal to 3 , anyone knwo the reason?
Pls! thanks!

do you want to use resistances to obtain a small gain with a fully opa?

 

[lijianheng]

Re: DC value problem?

DC value is not equal to transient result, DC value is the final transient response result. Consider RC delay.