On Saturday, March 26, 2016 10:57:01 AM jimlux wrote: > Consulting the time-nuts hive mind here.. > > I'm looking for off the shelf connectorized amplifiers with very good > reverse isolation for doing things like intermod measurements (e.g. 2 > signal generators followed by amps/pads into a combiner) and phase noise > measurements for a digital receiver. > > 1-100 MHz kind of frequency range.. > > I've used ZFL-500LN (30dB gain, 27 dB directivity in the data sheet, > which I interpret as 57dB reverse) , ZX60-4016 (really more of a > microwave amp, and not so hot reverse wise.. 25 dB) > > I'm not particularly cost constrained, so a higher power amp (which also > reduces distortion products from the amp) followed by pads is always an > alternative. > _______________________________________________ > 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. These seem to be somewhat scarce. One option is to add a unity gain high reverse isolation amplifier after your favourite low noise RF amp. Even these are scarce so constructing one may be your only option.improve distortion. A direct coupled series chain of CB stages should suffice. Either a push-pull setup or applying feedback around the first stage emitter will input Packaging and cable leakage may limit the achievable reverse isolation to a bit below 120dB.
Bruce _______________________________________________ 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.
