[time-nuts] high rev isolation amps

[Rob Sherwood.]

If you ask Mini-Circuits about the details of their amps that are specified as to having high reverse isolation, they have a pad in the circuit. I don't know whether it is in the input or the output.  Maybe both, looking at a ZFL-2AD specs. 

>From a Mini-Circuits data sheet it says: active directivity (dB) = isolation (dB) - gain (dB) 

Rob
NC0B

Sent from my iPad

> On Mar 26, 2016, at 6:00 PM, "Bruce Griffiths" <bruce.griffiths at xtra.co.nz> wrote:
> 
> 
> 
>> On Saturday, March 26, 2016 09:30:30 PM Rob Sherwood. wrote:
>> You cannot add the directivity and gain.  Doesn't work that way.  Rob, NC0B.
>> 
>> Sent from my iPad
> Minicircuits would disagree with that and its their amplifier.
> 
> Bruce
>> 
>>> On Mar 26, 2016, at 2:00 PM, "jimlux" <jimlux at earthlink.net> 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
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