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Measurements >> Phase Noise and Jitter Measurements >> Pll bandwidth
https://designers-guide.org/forum/YaBB.pl?num=1212645686

Message started by lvlei0309 on Jun 4^th, 2008, 11:01pm

Title: Pll bandwidth
Post by lvlei0309 on Jun 4^th, 2008, 11:01pm

Wide bandwidth
▸ VCO noise suppressed, CP noise passed
�� Narrow bandwidth
▸ CP noise suppressed, VCO noise passed

I have saw this on an IEEE presentation, is that right? I think it is wrong.

Title: Re: Pll bandwidth
Post by chenyan on Jun 5^th, 2008, 12:21am

why it is wrong?

Title: Re: Pll bandwidth
Post by lvlei0309 on Jun 5^th, 2008, 3:19am

CP noise transfer function is low pass, and VCO noise is high pass. so BW is high, CP noise is surpressed.