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Hi,
I'm currently designing a switched-capacitor (SC) filter. I try to run PSS and PAC analysis in SPECTRE to get the transfer function (H) to verify my gain and 3dB cut-off frequency.
However, the PSS analysis is failed with the following message: "Attempt to generate initial guess for DC solver failed. Zero diagonal found in Jacobian at ....."
I try to follow the guide from [http://www.designers-guide.org/Analysis/sc-filters.pdf] where I should set the initial condition of all the capacitors to ZERO & I also set the tstab parameter to 2us (fCLK=1MHz). I also disable the small signal at input (except PAC magnitude =0.1mV at Vin-)
Can anyone tell me what's wrong with my setup?
Thank you so much.
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