Re: Low noise high reverse isolation low distortion RF Amplifier
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You inject the test signal into the output of the RF Amp and connect the RF Amp Input port to
the test set detector. On network analyzers not providing automatic switching of input and outputs,
one simply reverses the connections on the analyzer. So the network analyzer signal source port? is connected to the RF Amp output and the network analyzer detector port is connected to the RF Amp Input.?
This is fairly straight forward with small signal amplifiers as the RF Amp output level is usually below
the damage threshhold of the analyzer's signal source port if the RF Amp should take off and
oscillate. With RF Amps that can provide output levels above a nominal? 0 dBm (50 Ohm system)
you need to insert attenuators at the output port of the amplifier or use a rf coupler which will
provide enough attenuation if the amp should decide to oscillate.
Unless verified, do not assume any amplifier is Unconditionally stable. Nothing will ruin your
day faster than burping your network analyzer.
Chuck WD4HXG
On May 13, 2023, at 9:22 PM, Jeff Green <Jeff.L.Green1970@...> wrote:
I have no idea how one tests reverse isolation.
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