I'm replying after a year. I have followed your suggestion. Used conical inductor for DC feed (since wide band application) and used series R and parallel R-C network for making the device unconditionally stable. This have solved my stability problem and Amplifier is working as expected. Thank you so much for your suggestion and insight. :smile:

thank you. I'll follow your suggestion.

Genesys uses 2.5D simulation while HFSS uses 3D simulation. I'm facing similar problem except that I used resistors and even I got different results from these softwares and I'm still working on that. Can you share your files so that I can see the problem?

You need to use lambda g which is the wave length inside the wave guide for a particular frequency

Also for push pull (balanced) type amplifier is stability analysis wrt one Fet enough?

Thank you. I'll try and simulate for my frequencies.

Hi Osman,
I've seen the article. It's about stabilizing at low frequencies by carefully biasing. Can I apply this concept at higher frequencies? Here for my case at 2 GHz?

Hi Osman,
I've seen the article. It's about stabilizing at low frequencies by carefully biasing. Can I apply this concept at higher frequencies? Here for my case at 2 GHz?