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# Pll Lock Measurement

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6 Threads found on edaboard.com: Pll Lock Measurement

## measure phase difference in square waves (one of which is noisy)

A bandpass filter is basically a good way. However, if you target to signals of variable frequency, it may get difficult. A standard tool in physical measurement technique implementing your pll idea would be a lock-in amplifier. lock-in amplifier - Wikipedia, the free encyclopedia

## Problem while locking PLL

Thanks for all. we get it from simulation only Phase noise is for total pll or only VCO

## PLL (4046) Design Help, Frequency Multiplication.

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 (...)

## higher PFD freq,slower locking time?

Hi everyone, 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 measurement resault. I once use (...)

## PLL-system level measurement

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

## How to solve a VCO measurement problem with phase noise

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