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how to set up transient & pss analysis of VCO in cds?

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pigkiller

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Since i wanna simulate a diff vco,I have referred to the diff vco example in the spectreRF user's guide & connected one current pulse to the reference port,but the fundemental freq i have got differ from the freq i designed.If i changed the rise time of the current pulse,different fundemental freq i got,so how can i?
who can tell me how to set up the right scheme vco simulation in cds?transient & pss both,thx
 

You could use differential output as the positive and negative output in the PSS setting
 

Re: how to set up transient & pss analysis of VCO in cds

That means there is something wrong with your circuit.
 

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