Hi Complicating the matter - the time it takes for the junction to go from full on to full off also contributes to the noise. An ideal mixer would switch instantaneously.... It's always a tradeoff between various noise sources.
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of ed breya Sent: Thursday, January 19, 2012 12:36 PM To: [email protected] Subject: [time-nuts] mixers for frequency measurement 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. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
