Hi Bob, In some article, I see people use a D-flipflop to sample the input signal with reference clock. When you want implement a mixer what's the difference between D-flipflop and XOR gate? Acorrding to my understanding, to multiply 1bit with another, I should use an AND gate, right? When you refer high speed CMOS XOR gate, do you mean 74LVC1G86?
Thanks BI7LNQ 2016-01-09 6:42 GMT+08:00 Bob Camp <kb...@n1k.org>: > Hi > > The board I have uses high speed CMOS single gate XOR’s. They have a > pretty good > phase noise floor (-170’s) so they should be pretty reasonable. > > Bob > > > On Jan 8, 2016, at 12:16 PM, Richard (Rick) Karlquist < > rich...@karlquist.com> wrote: > > > > > > > > On 1/7/2016 3:11 PM, Bob Camp wrote: > >> Hi > >> > >> If your intention is to run a mixer with saturated inputs …. just run > >> an X-OR gate. It will handle the high level signals much better than > >> an over-driven analog part. > > > >> Bob > >> > > > > If you look at the schematic of an XOR gate IC and compare it > > to the schematic of, for example, an MC1496 mixer, you will > > see a lot of similarity. If the gate is of the ECL type, > > it will have the addition of emitter followers, but that > > it a minor detail of implementation. I'm not sure there > > is a huge difference. ECL is a great logic family in > > general (self-confessed ECL-phile here :-) but it is > > probably the worst for phase noise, compared to the > > saturating logic types. > > > > Rick Karlquist N6RK > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.