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Dear antia66,; D/ W2 \$ N, }) p0 h7 D
If damping factor is choosen 2, how about the natural freqency?
/ P! A9 f8 N m1 TWill the natural freqency changed with damping factor ?7 D- g! |, ^# h. W/ ]
As my understanding, choose bandwidth <= 1/10*reference freq is for linear model is valid or not, that is, if need widther bandwidth PLL, the parameter from continuous model cannot provide expected PLL behavior.
' d9 e1 {6 P" k/ c2 C3 `However, VCO related noise causes the bandwidth cannot choosed to too high bandwidth.
+ e D, Z4 Q% A* {2 f; R3 O# XSo, linear model is usually useful. |
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發表於 2009-11-16 11:18:05
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