Nov 29, 2007 #1 DZC Full Member level 2 Joined Sep 12, 2006 Messages 149 Helped 13 Reputation 26 Reaction score 5 Trophy points 1,298 Activity points 2,122 1.Since PFD can't achieve zero phase difference,just to what extend can it reach,say tens of picoseconds? 2.As far as I know the crystal oscillators works below several hundereds of Meg Hz,can I conclude the Phase Detectors also work below such frequency? 3.Is there any circuit to realized the so called Zero Delay Buffer? Thanks for your kind hearted reply.
1.Since PFD can't achieve zero phase difference,just to what extend can it reach,say tens of picoseconds? 2.As far as I know the crystal oscillators works below several hundereds of Meg Hz,can I conclude the Phase Detectors also work below such frequency? 3.Is there any circuit to realized the so called Zero Delay Buffer? Thanks for your kind hearted reply.
Nov 29, 2007 #2 D dinesh agarwal Full Member level 3 Joined Oct 20, 2007 Messages 151 Helped 4 Reputation 8 Reaction score 1 Trophy points 1,298 Location Hyderabad India Activity points 2,074 reference to 1. the pfd can sense the phase delay of say two inverters but one need the sufficient delay because the switches the UP and Donw mos of the charge pump therefore for complete switching one need a delay of say 300 to 400 ps. think clear
reference to 1. the pfd can sense the phase delay of say two inverters but one need the sufficient delay because the switches the UP and Donw mos of the charge pump therefore for complete switching one need a delay of say 300 to 400 ps. think clear
Nov 29, 2007 #3 F Fahmy Full Member level 2 Joined Mar 21, 2007 Messages 130 Helped 28 Reputation 56 Reaction score 12 Trophy points 1,298 Activity points 1,973 DZC said: 2.As far as I know the crystal oscillators works below several hundereds of Meg Hz,can I conclude the Phase Detectors also work below such frequency? Click to expand... i think your conclusion is incorrect.
DZC said: 2.As far as I know the crystal oscillators works below several hundereds of Meg Hz,can I conclude the Phase Detectors also work below such frequency? Click to expand... i think your conclusion is incorrect.