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https://designers-guide.org/forum/YaBB.pl Measurements >> Phase Noise and Jitter Measurements >> PLL phase noise simulatioon using spectreRF https://designers-guide.org/forum/YaBB.pl?num=1299114250 Message started by Dinesh Agarwal on Mar 2nd, 2011, 5:04pm |
Title: PLL phase noise simulatioon using spectreRF Post by Dinesh Agarwal on Mar 2nd, 2011, 5:04pm 1. I could simulate the phase noise of PFD+CP+LP using PSS and Pnoise simulation. 2. In second case only PFD+Cp was included for same setup. The result in both the cases are same. Is this right, i think there should some difference in twocases, as there is resistance thermal noise in LP Pls comment |
Title: Re: PLL phase noise simulatioon using spectreRF Post by rajkumar palwai on Apr 10th, 2011, 3:42am Hi Dinesh, What is the freq range of your pss+pnoise simulation? If u are simulating at low freq, then your CP flicker noise can be so dominant that you are unable to see the filter resistor thermal noise contribution. regards rajkumar |
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