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https://designers-guide.org/forum/YaBB.pl Measurements >> Phase Noise and Jitter Measurements >> VCO and frequency divider https://designers-guide.org/forum/YaBB.pl?num=1170666464 Message started by paulcktang on Feb 5th, 2007, 1:07am |
Title: VCO and frequency divider Post by paulcktang on Feb 5th, 2007, 1:07am I am new to phase noise simulation. I now simulate a combined vco and frequency divider. VCO frequency is 200 MHz and divider is in 8 divide ratio. I followed the ways described here to find the phase noise of VCO as I can choose the oscillator node as VCO output. However, I can't find the phase noise of frequency divider because the phase noise at the output of divider is the total phase noise of VCO and divider. Am I right? Besides, if I know both the phase noise of VCO and frequency divider, how can I calculate the contribution of these phase noise to PLL system? THANKS A LOT |
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