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

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Nov 23 17:38:11 UTC 2012


NIST have shown (at least at 10MHz) that the high level mixers they 
tested are noisier than the ZRPD1.

Bruce

Alan Melia wrote:
> 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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