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

Alan Melia alan.melia at btinternet.com
Fri Nov 23 18:30:27 UTC 2012


Not unreasonable Bruce......no free lunches etc.  :-))
Alan
G3NYK


----- Original Message ----- 
From: "Bruce Griffiths" <bruce.griffiths at xtra.co.nz>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Friday, November 23, 2012 5:38 PM
Subject: Re: [time-nuts] Best phase detector / mixer for 100MHz?


>
> 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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>>
>>
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>
>
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