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[SOLVED] Phase noise improvement

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shashy.br

shashy.br

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Hi all,

My OCXO(30MHz) provides me with a phase noise of -120dBc//Hz at 100Hz offset from the carrier,
but i need the phase noise to be better than -135dBc/Hz,is there any device (like jitter cleaners) to improve my phase noise situation ?:?:
 

I have never heard of a phase cleaner. Almost anything can cause phase noise. One experiment you could try is to replace the PLL derived control DC with DC from a PSU to see what rubbish is coming from the PLL. Is the Q of the oscillator tuned circuits OK. One problem I had about 40 years ago was feedback from the "digital" circuits back via the buffer to the oscillator. In the end, we had to use two common base transistor amplifiers in series to get the required i/o isolation.
Frank
 
ThanQ for replying,
I am using only passive components to generate the required output frequency like multipliers and mixers.
 

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