[time-nuts] DMTD using Active Mixers

Magnus Danielson magnus at rubidium.dyndns.org
Thu Nov 12 06:13:21 UTC 2009


Bob Camp wrote:
> HI
> 
> I have no direct experience with the Minicircuits "active mixers", but I 
> have used some of their amplifier chips. I suspect they use their own amps.

Or at least the same amps.

> The amps I worked with had significant phase noise issues when driven 
> within 6db of their 1db compression point.  They were "ok" at low drive 
> levels. More or less then went from 3 db noise figure to a > 20 db nf as 
> you went from -20 dbm to  0 dbm output on a +7 dbm amplifier.

Uhm, that sounds more like distorsion than noise. Anyway, if it is the 
same amps, then that would exclude them from being suitable for driving 
the mixer to saturation. Thanks for the report.

Cheers,
Magnus



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