Nothing has come to my attention in the last 35 years that is superior for buffer amplifiers to the simple cascade of grounded base transistors as described by numerous NBS/NIST papers. The chain usually starts with a common emitter (with emitter degeneration resistor), which is an even older NBS classic.
I realize you asked for an OTS connectorized version. Unfortunately, I have never seen one of these offered in said 35 years. When I worked for Agilent, there was an IC version made by a captive fab. It was never spun off as a commericial part via the semiconductor division (which is now Avago). In the early 1980's, I designed a crystal oscillator and buffer amplifier for the HP 10816 rudibium standard. The crystal was a 10811 crystal and used the Colpitts oscillator from the 10811. The Colpitts in the 10811 fed a grounded base amplifier via the crystal. In the 10816, I used a cascade of 3 GB amplifiers. This worked better than the original 10811 buffer amplifier. Rick On 3/26/2016 10:57 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.
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