hmm, thats something I did not looked at. I will check on it. What u say is different from putting an attenuator after vna, is that correct?
Being of K>1 in ADS does not mean that the amplifier is unconditionally stable.Practical measurement is the right reference.@BigBoss
That's what I thought first, then I looked back to my design in ADS, K >1 at all times. My S11 and S22 are quite fine at -15/-20 db levels. How can I be sure it oscillates? Is there a setup you use to be sure for it?
What would be your choice on while collecting data?
A-) Putting an attenuator to port 2
B-) Decreasing Port power of VNA ( but u said this would be hard to calibrate, can you elaborate on this)
Hmm, mb I should do that, but the "jumping" s21 behavior is still what confuses me. How can a s21 jump because of wrong calibration?
Can you show the measurement, so that we see the jumps? What calibration method have you used?
Strange, the jump is at different frequencies? I assume you have repeated the calibration and the effect is still the same? Do you also see this with other DUT like an attenuator?
3- The jumping issue kind of solved by giving -40dbm from input port(alas, calibration of thru was a nightmare), but im expecting a return from Tektronix as well.
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