Brian Could you give some more details? I think alternative solutions to MMICs at 5 and 10MHz would give much lower phase noise.
Bruce's web pages have a number of designs that will get the 5MHz reference up to 20MHz in 2 stages :- http://www.ko4bb.com/~bruce/FrequencyMultipliers.html Another approach would be to use op-amps instead of MMICs, op-amps with a low flicker corner frequency should give lower close in noise than a MMIC, but probably won't be as good as a discrete solution. regards Grant > > > Looking for comment here... > > The background: > I'm working on a sub mm-wave LO chain for > a ham radio application. While chasing issues > of close-in phase (ie: within 1KHz of RF > carrier) by peeling the "layers of the onion", > I'm starting to question the performance of > the MMICs that are used as buffers and amps > following my Wenzel reference OCXOs. > > Question(s): > Should any MMIC be allowed to be driven > close to compression or into compression > when striving for best close-in noise? > > I know and have seen the NF of a MMIC > degrade while in compression, but my > target right now is close-in noise rather > than broadband noise. > > My design, in summary, takes 5MHz up to 630GHz > via several multipliers and PLL stages. > > -Brian _______________________________________________ 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.
