AnsweredAssumed Answered

Basic stability circle issue in ADS

Question asked by rlyc on Jun 25, 2013
I'm self learning amplifier design in ADS. The problem in picture(link).

The smith chart in a green box is the correct answer. The smith chart I simulated, however, is inconsistent with the values of "cir_center" and "cir_radius", even though they use the same S-parameters.

Also, I tried to find the center of the stability circle manually. For example, the manually calculated source circle is at Cs=2.369/82.645, but this magnitude is off compared to "cir_center", which is the correct answer. I can't find the reason why this difference occurs.

Any help is appreciated, thank you.

Edited by: rlyc on Jun 25, 2013 1:25 PM