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the cp current ratio between FD／CP and PD/CP in CDR. (Read 1534 times)

ipmsn5 New Member Offline Posts: 5 China	the cp current ratio between FD／CP and PD/CP in CDR. May 18^th, 2010, 2:41am Dear all, I start the cdr 2.5gps circuit now, would you please give me a charge pump current ratio between freq detector CP and phase detector CP? By the way, I see some papers show that the off chip filter is better, do you think so? thanks for your help.
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love_analog Senior Member Offline Posts: 101	Re: the cp current ratio between FD／CP and PD/CP in CDR. Reply #1 - May 31^st, 2010, 7:42am Write the equations for the loop Bw and damping. There is no one answer. Typically you want much larger BW for the FD loop to keep acquisiton time low. For PD one, Jtol determines your BW
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