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How to calculate the PLL locking time?

时间:04-09 整理:3721RD 点击:
Someone kowns how to calculate the PLL locking time give me some help, please.
Paper or ebook, thanks.

I suppose, you are speaking of "pull-in"-time - that es the time to acquire lock starting with an incoming frequency which is different vom the VCO frequency.
In this case. only an approximation can be given as follows:

t,pull≈(Fd)2/(4ΠDFn3)

Fd=Fin-Fvco ; Fn=natural frequency of the loop
Loop damping D=1/2Qp .

PLL Lock Time[usec] = [400 / Loop_Bandwidth[kHz]] * [1-10*LOG(Freq_tolerance[Hz] / Freq_jump[Hz])]

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