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PSS converg. error on adding capacitor unit to cap-bank in Ring oscillator (Read 128 times)
subtr
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PSS converg. error on adding capacitor unit to cap-bank in Ring oscillator
Mar 06th, 2017, 9:18pm
 
I have a pseudo differential ring oscillator (where there are two ring oscillators with coupling creating a differential output) in the output of which I have a few capacitor banks to change frequency. If I had just connected 3 LSB banks, I see no issue with convergence. But the moment I add the next bits corresponding the higher cap values, I see that the pss does not converge. Anyone has faced any similar error where a unit in capacitor bank caused a pss convergence failure.
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Ken Kundert
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Re: PSS converg. error on adding capacitor unit to cap-bank in Ring oscillator
Reply #1 - Mar 8th, 2017, 9:51am
 
Are you sure the two oscillators are oscillating as one? Are the waveforms truely periodic?

-Ken
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