How to choose the size of a transistor for power amplifier? use ADS

[Bailey_NTF]

I am designing a 2-stage power amplifier using GaN technology and am currently selecting the transistor size. I aim for maximum power and efficiency, as well as achieving higher PAE and POUT at the P1dB point. However, while larger transistors generally perform better in these aspects, they also consume more area. I noticed from IEEE papers that not everyone uses the largest possible transistors. How should I determine the optimal transistor size?

 

[D.A.(Tony)Stewart]

Do you have any specs? (With min or max)

When you have enough specs , the selection becomes more focused.

 

[Bailey_NTF]

class AB power amp. When P1dB 30% up PAE and 30dBm up Pout ,2 trainsistors

 

[D.A.(Tony)Stewart]

What gain-BW? max spectrum? Max power ?
Budget?
Etc ….

Turnkey ISM RF Energy Solutions by Mini-Circuits

lp.minicircuits.com

 

[Bailey_NTF]

When P1dB
30% up PAE
30dBm up Pout
20up Gain
Freq 30Ghz
S11&S21-3dB BW 28GHz&32GHz
NO Budget but only 2 trainsistors