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

Didier Juges shalimr9 at gmail.com
Wed Mar 12 07:12:55 EDT 2014

The LMH6702 is a wicked fast op amp which will react accordingly it there are parasitics in the feedback path. I have only used them with well laid out PWBs and extremely short traces to surface mount resistors. Under those conditions, they work beautifully as advertised. Not sure anyone other than John can actually breadboard with them :)

Didier KO4BB

On March 12, 2014 4:57:23 AM CDT, Anders Time <anderstime at gmail.com> wrote:
>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
>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
>signal so it matches the LMH6702 input voltage range without increasing
>noise level.
>I´m using a double balanced mixer form mini circuits as phase detector
>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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