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jitter vs center frequency (Read 542 times)
iVenky
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jitter vs center frequency
Jan 17th, 2018, 7:50am
 
Hi,

I am trying to measure the jitter of a clock signal by sending through a transmitter using 11001100 pattern (fclk/2) and 1010 pattern (fclk).  First, the absolute RJ should be the same on both cases, right? Also, if I integrate the phase noise over a certain bandwidth, it should be the same in both the cases, right?

Also, I am seeing a mismatch in the jitter obtained from a scope (through histogram) and integrated jitter from spectrum analyzer. Is that possible?
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deba
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Re: jitter vs center frequency
Reply #1 - Jan 21st, 2018, 8:49pm
 
The phase noise will scale with the centre frequency. If you double the frequency, phase noise goes up by 2. This is to maintain the same timing jitter.

Can you share your setting in scope and spectrum analyzer?
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