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https://designers-guide.org/forum/YaBB.pl Modeling >> Behavioral Models >> pll veriloga model nosie analysis https://designers-guide.org/forum/YaBB.pl?num=1274113997 Message started by tea on May 17th, 2010, 9:33am |
Title: pll veriloga model nosie analysis Post by tea on May 17th, 2010, 9:33am Dear Experts i have a few questions on pll veriloga phase noise modeling. i created voltage-domain VCODIV/PFDCP/OSC veriloga models based on Ken's paper: Predicting the Phase Noise and Jitter of PLL-Based Frequency Synthesizers. I bumped into some issues need your advice!!! Thank you!! 1) did i insert phase noise in the right way? if not, what is the right way? i need to use noise transfer functions derived from Matlab based on design correlated phase noise-frequency pair. so my voltage outputs of OSC for example is like: originally it was like this: vnoise = $rdist_normal(seed,0,1) * laplace_nd(V(in),{2.686e26,3.105e20}, {1.954e33, 9.858e27,1}); however, the full PLL PSS/Pnoise analysis can not take the hidden state 'seed' nor the 'state' variable in PFDCP model, Spectre RF errors out in PSS analysis I also tried to put the noise filter to a white_noise source, AC analysis can show the noise filter effect, not noise analysis vnoise = laplace_nd(white_noise(1,"wpn")+V(in),{7.047e21,6.032e15 }, {6.646e28, 1.921e23,1}); V(out)<+ V(in)+vnoise; so in short, i can only see the noise filter effect in AC analysis, i can not do PSS/Pnoise analysis on the full pll with voltage-domain models 2) it seems to me, i can only use AC analysis, not PSS/Pnoise analysis? i am thinking i can try phase-domain models too, however, only AC analysis shows the noise filter effect; so i can only use AC analysis? i can not use PSS/Pnoise analysis for the full pll? sorry if i asked silly questions, i kind of new to this pll noise analysis thing thanks for your wisdom! jasmine |
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