Thanks for your inputs... I dont know exactly which are the microcircuits ActiveMixers you refer to; just to make it clear, the IC that I am using is Analog Devices AD831, which basically has a conventional diode mixer, a limiter amplifier in the LO input and a low noise output amplifier.
Regards, Mario On Thu, Nov 12, 2009 at 1:39 AM, Magnus Danielson < [email protected]> wrote: > Bruce Griffiths wrote: > >> Hej Magnus >> >> To confuse matters Minicircuits use the term active mixer for a >> conventional diode mixer that uses amplifiers on the LO and/or RF ports to >> boost signal levels. >> > > While it confuses matters, it is usefull to know about them, since they may > be good for some designs, but maybe not for DMTD designs. > > I have argued that keeping a buffer-amplifiers (not to be confused with the > -120 dB isolational amp) just at the mixer will relief the issues of VSWR to > tempco. Also, getting that extra boost is also good. Needs to have > meaningfull phasenoise to be usefull thought. > > > Whereas I was referring to mixers like gilbert cell mixers as active >> mixers. >> > > I was making the same distinction. Passive JFET mixers is just another > variant to using schottkydiodes. > > > With the Minicircuits so called active mixers one needs to measure their >> phase noise in order to make meaningful comparisons. >> > > Indeed. Their target is probably not considering cutting edge DMTD systems. > > Cheers, > Magnus > > > _______________________________________________ > 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.
