[time-nuts] Close-in phase noise question...more info...

wa1zms at att.net wa1zms at att.net
Tue Dec 16 16:39:20 UTC 2008


First, thanks for the replies from all.


More info on the LO chain:

1) 5MHz Wenzel OCXO <--Custom Osc for me.
2) MSA-1105 buffer MMIC and lumped LPF
3) 5MHz to 10MHz 1N5711 diode based doubler
4) MSA-1105 buffer and lumped LPF
5) 10MHz to 20MHz 1N5711 diode based doubler
6) 20MHz BPF
7) 20MHz drives sampling detector inside surplus Frequency
West PLL block to lock 1320MHz cavity oscillator.
8) 1320MHz drives Frequency West SRD multiplier to 6.6GHz.
9) 6.6GHz to 39.6GHz Milliwave diode multiplier/amp/filter
10) 39.6GHz to 79.2GHz in varactor doubler
11) 79.2GHz to 158.4GHz in varactor doubler
12) 158.4GHz into x4 sub-harmonic mixer

So my question was based on best close-in phase
noise in LO chain going from 5MHz to 20MHz.
My MSA-1105 MMICs may be running near or just
into compression and I may need to adjust the
design gain stack-up.

-Brian






More information about the time-nuts mailing list