6 Threads found on edaboard.com: Pll Lock Measurement
Depends on the frequency and amount of noise. A couple of comparators which may need hysteresis if the signal is very noisy. Then measure each cycle and do a lot of averaging.
Hi Keith - I would like to drive the laser at at least 1MHz, potentially significantly faster.
I was assuming I'd have to pu
Analog Circuit Design :: 08-21-2011 13:56 :: uoficowboy :: Replies: 5 :: Views: 688
Here i attached the control voltage to the VCO of pll.
From this i know my pll(2nd order pll) is going to lock that is the input of the VCO well known from PSS analysis.
But i got some oscillation while locking the phase of the signal(2nd wave)
(Measured by delta cursor i got 50
Analog Circuit Design :: 08-01-2011 08:06 :: vasusathiyam :: Replies: 4 :: Views: 955
I am trying to get a simple frequency multiplication scheme to work, but am having trouble getting the pll to lock.
Background:I am sampling (frequency measurement) my signal at 1Hz, I can not sample any slower, and need to get a measurement resolution of 0.1Hz minimum. My input signal goes from 0-1kHz, so at the very low (...)
Analog Circuit Design :: 04-06-2011 12:40 :: abrand :: Replies: 0 :: Views: 1944
I have met a problem on pll lock time. I found that the pll with 10MHz PFD
freq has a great smaller lock time than a pll with 30MHzPFD,although they have
the same loop band width and phase margine. this is an experiment
I once use (...)
RF, Microwave, Antennas and Optics :: 06-29-2010 21:40 :: fenfei :: Replies: 0 :: Views: 700
For those of us without the latest gear, we can use a diode detector to measure the amplitude of the rf output; and can use a delay line frequency discriminator (signal splitter, delay line, mixer, manual phase shifter) which can tell you both when the frequency is settled, and when the phase is settled, by watching the mixer IF output on an osci
RF, Microwave, Antennas and Optics :: 12-08-2009 12:13 :: biff44 :: Replies: 4 :: Views: 893
VCOs are very sensitive to control voltage. So you need to filter it as much as you can. Supply voltage has to be filterd also, and a shield for the board can be necessary.
A good way to measure it is lock with a pll with a very small loop bandwidth. For freqs larger then the loop bandwidth you'll see the VCO phase noise.
A more expensive solutio
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 09-12-2006 09:17 :: Mazz :: Replies: 3 :: Views: 1064