[time-nuts] How to measure phase noise of HCMOS oscillators?

Anders Time anderstime at gmail.com
Wed Mar 12 05:57:23 EDT 2014

Thanks a lot for the input!
I will try to use the LMH6702 as buffer.
The correct way to measure the HCMOS oscillator would probably be to use a
high impedance buffer with very low noise, to simulate driving a 10pF load
or so. But I guess that is not easy to do. The LMH6702 voltage noise is
probably low enough, but I do not know if it is possible to bias the HCMOS
signal so it matches the LMH6702 input voltage range without increasing the
noise level.

I´m using a double balanced mixer form mini circuits as phase detector that
can take 14dBm signals and a SRS FFT analyzer to measure the noise. The
oscillator that I´m measuring is a 100MHz Crystek.

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