[time-nuts] mixers for frequency measurement

ed breya eb at telight.com
Thu Jan 19 12:36:30 EST 2012


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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