[time-nuts] mixers for frequency measurement

steve heidmann steveheidmann at yahoo.com
Thu Jan 19 19:40:01 EST 2012


The SD101 is your jelly bean small signal schottky. Cheap enough to buy in bulk
to match as well.
--- On Thu, 1/19/12, ed breya <eb at telight.com> wrote:


From: ed breya <eb at telight.com>
Subject: [time-nuts] mixers for frequency measurement
To: time-nuts at febo.com
Date: Thursday, January 19, 2012, 9:36 AM


Yes, they are Schottkys, just like the ones used in most mixers - but much bigger and slower. They would have to be properly impedance matched, and could be driven to higher power levels, with higher diode conductance, so (I think) much lower noise. Of course, amplifying up to higher power will add noise, so it's not "free" in that respect.

Ed

Stefan wrote:
1N5817 are schottky diodes. Wouldn't they saturate much earlier than a 2N2222A? If saturation is the right word with a schottky diode...

I wrote:
> 5 or 10 MHz could be made even better. I wonder how a ring of matched
> 1N5817s would work at saturated power levels - maybe +20 dBm or so.




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