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SpectreRF simulate VCO phase noise with divider (Read 5185 times)

neoflash

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Mixed-Signal
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Posts: 397

SpectreRF simulate VCO phase noise with divider
Jan 17^th, 2008, 6:51am

Since I failed to get reasonable result, from EldoRF, for a cascaded VCO and divider, I turned to spectreRF.

I'm simulating a 5G VCO with a cascaded divider-by-4. I'm probing phase noise at the output of divider.

When I setup the beat frequency as 5G and put probe at VCO output, the pss analysis can not converge. However, when I put the probe at divider output and set beat frequency as 1.25G, the simulation converged with some warning.

I'm not sure whether it is the correct setup. Since spectreRF is more used among people, hope i can get some help. Thanks.

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Stefan Senior Member Offline Posts: 124	Re: SpectreRF simulate VCO phase noise with divide Reply #1 - Jan 17^th, 2008, 6:53am Put probe output on vco but set beat frequency to 5G / 4 = 1.25G Slowest frequency in circuit should determine you period for the PSS.
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neoflash Community Fellow Offline Mixed-Signal Designer Posts: 397	Re: SpectreRF simulate VCO phase noise with divide Reply #2 - Jan 18^th, 2008, 1:52am Yes, thanks. I found the results are different if I put probe at divider output.
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