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about VCO modeling (Read 2900 times)

jeffyan Community Member Offline Posts: 47	about VCO modeling Dec 19^th, 2006, 6:27pm hi all, we usesually model the voltage-controlled oscillator like this: f=Kvco * Vc. and Kvco is extracted by a dc sweep of Vc. but i want to question that whether Kvco is frequency dependent? if yes, why we ignore it? thanks, jeff
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ywguo Community Fellow Offline Posts: 943 Shanghai, PRC	Re: about VCO modeling Reply #1 - Dec 21^st, 2006, 8:24pm Jeff, Do you want to make the model too complex? Obviously, probably the PLL is not stable if Kvco is frequency dependent. BG Yawei
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jeffyan Community Member Offline Posts: 47	Re: about VCO modeling Reply #2 - Dec 21^st, 2006, 9:05pm HI, i think, the reason why we ignore the frequency-depedance of Kvco, is Kvco(f) is of a low-pass property, and its cut-off frequency is larger than PLL' bandwidth. this is my own opinion for your consideration. jeff
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ywguo Community Fellow Offline Posts: 943 Shanghai, PRC	Re: about VCO modeling Reply #3 - Dec 25^th, 2006, 1:38am Jeff, I don't understand why Kvco is of a low-pass property? Would you please explain it or present an example? Thanks Yawei
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