how do i do xf analysis?

[teraze]

would anybody give me an explanation of what is xf analysis?
i can't find in specture analog environment.
And how can i use it to do the simulation, such as the measure the
CMRR of an differential op amp
thank you very much

 

[Svenn Are Bjerkem]

In article <UKedneIjXO3yaufeRVn_vQ@giganews.com>, teraze@163-dot-com.no-
spam.invalid says...

would anybody give me an explanation of what is xf analysis?

XF is a small signal analysis. It gives you the transfer function from
any source to one selected output in one run.

i can't find in specture analog environment.

spectre -h xf

And how can i use it to do the simulation, such as the measure the
CMRR of an differential op amp

XF will give you the transfer function from each pin (you need an
independent source from ground to the pin) to the output (if you select
it in the analysis setup form). Then plot(20dB(VF("/inp")-VF("/inm")))
--
Svenn