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Measuring Time Jitter and Phase Noise of a Frequency Modulated wave.

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sandesh564_123

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I was asked to find a method to measure Time jitter and Phase noise of Frequency modulated wave.

I tried to search a lot but in-vain.

If any body has any idea or document which can be helpful for me then it would be great.

Thanks.
 

In a CW carrier, the time jitter is figured out by integrating the phase noise, thereby converting it to pk-pk or rms time jitter.

If one is deliberately FM modulating a carrier, then that FM modulation will easily dominate over the phase noise effect. So all you have to do is analyze the fm modualtion and you will have the answer. You need to know the deviation and the moudlatating frequency(s). If the deviation is large, then small angle approximations do not apply and you will have a lot of time jitter!
 

Sandesh, If I understand you correctly, you can measure phase noise like you normally do but ignore the FM tone in your phase noise plot. For example, if your FM frequency is fixed at 10kHz, the phase noise near 10kHz is not valid (not measureable). All phase noise at other frequency points are still valid. This works if your FM frequency is fixed.
 

thanks for the reply...

If u guys have any Doc's or Pdf's on this please share.
 

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