[time-nuts] Best phase detector / mixer for 100MHz?

Alan Melia alan.melia at btinternet.com
Fri Nov 23 16:48:41 UTC 2012


Hi Anders, isn't this format exactly what is inside the high level mixers 
(spec'e +17dBm) from Minicircuits?
Alan
G3NYK

----- Original Message ----- 
From: "Anders Time" <anderstime at gmail.com>
To: <time-nuts at febo.com>
Sent: Friday, November 23, 2012 3:42 PM
Subject: [time-nuts] Best phase detector / mixer for 100MHz?


>I have been using an minicircuits mixer as a phase detector for measuring
> low frequency(5-10MHz) and it is usually good enough. But when I want to
> measure 100MHz the sensitivity of the mixer decreases a lot, so when I 
> want
> to measure some really low noise 100MHz(Pascall -178dBc floor with 18dBm
> out) oscillators the sensitivity is not good enough. I read in an old
> article by Walls, Stein et al(Design considerations in state-of-the-art
> signal processing and phase noise measurement system) that one can use two
> diodes in series in the double balanced mixer to increase the sensitivity.
> I tried this with some standard 1n5711 Schottky and the sensitivity is now
> 1V/rad, but is there a easier way to do this? /Anders
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