The Minicircuits RAM-8+ amplifier has been replaced by the pin compatible RAM-8A+ part. The old RAM-8+ part was conditionally stable and I had to use an extra output attenuator after the amplifier to ensure that it did not oscillate during open-circuit output conditions.
It appears from the Minicircuit supplied S-parameters plotted in terms of the stability factor k and the geometric stability factor μ that the new RAM-8A+ is completely stable across the operational band; however it does have sharp dip in μ at 50 MHz that approaches the unconditional stability limit line of 1.
I would like to test the new amplifier under stressed conditions to verify that it is indeed stable. My initial thought for a test setup would be a directional coupler on the RAM-8A+ output with the thru port alternated between open and short, while monitoring the coupled port for signs of instability. I'm curious if there are any other good setups for testing the stability of such an amplifier, e.g. monitoring the drain feed with a oscilloscope under open/short load conditions?