Hi: though It's not a continues circuit, I use this method to perform AC analysis:
1. I perform TRAN analysis and save the operating point at 100us
2.then I load the operating point and perform AC analysis.
in fact, I think use PSS & PAC to simulate circuit is the method that I mentioned above.
At the same, I use Hspice rather than Spectre, so I can't perform PSS & PAC analysis?
regard!
Added after 35 minutes:
Hi Yanhui:
give a pulse source, get enough tran analysis data. sample and FFT at MATLAB.
so u can get the freq-character about this filter.
would you give me the detailed process to get the freq-character about this filter?
thanx!