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How to use an ac command?

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ampper

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The chip has a soft-start and some blocks need time to strat-up .
if i run an ac simulation,the chip does not work and the result is wrong.
So,how to have an ac simulation when the chip is working .


Thanks for your help!
 

ampper said:
The chip has a soft-start and some blocks need time to strat-up .
if i run an ac simulation,the chip does not work and the result is wrong.
So,how to have an ac simulation when the chip is working .


Thanks for your help!
Click to expand...

if ac simulation can not simulate soft-start , why not remove it and replace it with ideal block?
 

u can set initial conditions that represent steady state
 

Thanks！

I replace the soft-start block with a steady state,but i am not sure whether the ac simulation result is right or not.

Can have ac simulation when block have a start-up circuit?

The start-up time is about 1ms
 

i think the soft-start is time domain function. however ac is the frequency domain.
ac can not simulate soft-start.
 

For AC analysis, first find bias point of your circuit and use them for your AC simulation because bias points in your circuit will not be changed for AC analysis.
 

set working dc poit for ur ac simulation initial conditios.
 

remove the soft-start block

Added after 1 minutes:

or you can set the input of soft-start of the opa to VDD
 

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    ampper

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