If you want a low noise mixer use a varicap mixer. A varicap has no
ohmic characteristics thus
no Johnson noise.
Secondly, You can create low noise harmonics using a vaicap multiplier
or a nonlinear transmission
line using inductors and nonlinear capacitors (varicaps). NIST has been
doing this for some time and even has
used nonlinear fiber optics to phase lock oscillators to lasers as atomic
references. Guys got Nobel Prize for that
one. Measuring the phase noise at a high order harmonic has the advantage
that the phase is multiplied by the harmonic
number thus bring the sidebands up further from the noise floor.
Here is a reference, that could be scaled down for your frequency, on
phase noise measurements using harmonics produced
by a nonlinear transmission line. This example just a few sections in its
nonlinear transmission line
73
Bill wa4lav
http://ecee.colorado.edu/microwave/docs/publications/2008/Milos-Jason-TMTT-July08.pdf
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
