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PSS and PAC Help Requested

Bairdi

Hi,

I am currently designing a switched-capacitor filter. I try to run PSS & PAC to get the transfer function in order to verify my gain and 3dB cut-off frequency. However, the PSS simulation seems like running forever. I check the Netlist and it shows:

Periodic Steady-state Analysis 'pss' : fund = 1MHz
Attempt to generate initial guess for DC solver failed.
Zero diagonal found in Jacobian at ' I103.net320'
Reordering Jacobian
and so on....

Can anyone please tell me how to solve this? 

The setup I put in PSS analysis is:
CLK1= 1/1us
CLK2= 1/1us
Beat Frequency= 1MHz
Number of Harmonics = 0
Accuracy Defaults (errpreset) = liberal

Thank you so much.

 

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