Problem on AC simulation in Spectre

[abcyin]

Hi, all

I met a problem when I was trying to get the AC response of a circuit. you know that the AC analysis in spectre is based on DC analysis, but the circuit is going to be settled after some time, that's to say, waht I really want is the AC response of the circuit after some time, but not at time 0. So how could I get what I want? any hints are welcome.

Thanks in advance,
abcyin

 

[erikl]

• Run a transient analysis up to your settling time
• Save the OP
• Start AC analysis using the previously saved OP

See the scanned page from Ken Kundert's book below.