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https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> How to design a PLL according to specs? https://designers-guide.org/forum/YaBB.pl?num=1089161992 Message started by hanjiemy on Jul 6th, 2004, 5:59pm |
Title: How to design a PLL according to specs? Post by hanjiemy on Jul 6th, 2004, 5:59pm hi, every one. for low vco jitter, I use hspice vco macro instead LC tank vco. ********************************************* vcc vcc 0 2.7 vee vee 0 0 xin2 Vtune 0 out1 out1b vco f0=141meg kf=35meg phi=0.0 out_off=0.0 out_amp=0.1 .macro vco in inb out outb f0=100k kf=50k phi=0.0 out_off=0.0 out_amp=1.0 gs 0 s poly(2) c 0 in inb 0 '6.2832e-9*f0' 0 0 '6.2832e-9*kf' gc c 0 poly(2) s 0 in inb 0 '6.2832e-9*f0' 0 0 '6.2832e-9*kf' cs s 0 1n cc c 0 1n e1 s_clip 0 pwl(1) s 0 -0.1,-0.1 0.1,0.1 e out r s_clip 0 out_off '10*out_amp' eb outb r s_clip 0 out_off '-10*out_amp' .ic v(s)='sin(phi)' v(c)='cos(phi)' vr r 0 1.86 .eom ***************************************************** but after a few micro secs, it lost oscillation. ( this macro cell is no problem). can u encounted problem like this. what happen???? thanks |
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