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The Designer's Guide Community Forum › Design › Mixed-Signal Design › charge pump mismatch, reference spur and jitter
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charge pump mismatch, reference spur and jitter (Read 2519 times)
keikei
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beijing
charge pump mismatch, reference spur and jitter
Mar 27th, 2008, 8:28am  
In a charge pump PLL, the charge pump current mismatch causes reference spur in the PLL output spectrum.  Is it possible to FFT the PLL output in a transient simulation by spectre to find the reference spur?  Is the mismatch or the reference spur one of the sources of PLL’s deterministic jitter?
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Visjnoe
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Re: charge pump mismatch, reference spur and jitte
Reply #1 - Mar 28th, 2008, 2:38am  
Dear Keikei,

1. Yes, you can detect the reference spur in the PLL output by taking its FFT.

2. Yes, the reference spur is a source of deterministic jitter, since you now the exact
   cause of the jitter component at this frequency (namely the reference).

Kind Regards

Peter
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