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10 Threads found on Pll Natural Frequency
The natural frequency of a system is the frequency at which it would oscillate (say, for a step input) if there is no damping. So does this mean, the ideal natural frequency should be as low as possible? So that it does not oscillate and just settles quickly I have a pll with an output (...)
What is the formula for the 3dB bandwidth of a pll in terms of the natural frequency and damping??? All the formulas I see online are giving me one answer, but when I create a simple linear AC test bench in Cadence and do an AC simulation, I am getting a different answer. Can somebody look at this test bench and tell me if I am doing (...)
Hi, Loop filter is to proved dc voltage to VCO and hence VCO provides frequency based upon input control voltage. There are calculations from loop filter for stable operation of pll like Bandwidth, damping factor, natural frequrency, phase margin. Bye.
Hi, If I am building a pll to lock on to a shifting signal around the range of 160Mhz, I would like to achieve a faster lock time... what is the parameter I can tweak to achieve this? Can I simply increase the frequency resolution? meaning smaller channel BW Thanks regards
1, When designing pll, it is always said that pll's bandwidth should be set to be smaller than Fref/10. what's the pll bandwidth? Is it Wc(open loop unit gain bandwidth), Wn( natural frequency) or W-3db ( closed loop -3db frequency)? 2, and I know Wc means the frequency (...)
I am just curious to know why you would want to use a 3rd order loop filter?Is it because of jitter considerations(since the VCO ripple is reduced?). As far as I know, all the papers on plls have used only a 2nd order LPF with the 3rd pole being far enough so as to not interfere with stability. Further, may be you can derive the transfer functi
1) pll natural frequency <=Hsync frequency/pll Stability Ratio 2)pll natural frequency = square root Ct=0.082uF Ip=charge pump current N=pll Divide Ratio P=Post Divide Factor* pi=3.14 Kvco=MHz/V Can anyone (...)
Hi, I would like to ask: how can you estimate the damping factor and the natural frequency from the plot of the transfer function of a device (say pll)? Added after 2 hours 2 minutes: I actually found the method to estimate those parameter. I uploaded the file just in case anyone wants to reference to it
Capture range, ?ωL, is the range of frequencies were if the frequency of the reference signal, Sr, get into it, the pll will try to acquire lock in at most one period of the natural frequency, Wn.
hi Can you pls explain the meaning and physical significance of the following terms which we usually use with pll. 1. natural frequency ( Wn) 2. Loop bandwidth. (Wc) yours SavithRu