Transmit Power Amplifier in Compression!!!

[smoqaster]

Hello there...

I don't know much about amplifiers, so I appreciate anyone's input.

I read somewhere that "transmit amplifier typically run into compression to improve efficiency."

I'm wondering as to why is that... isn't an amplifier more efficient in the linear gain region???

Thanks for any help I can get!

 

[vfone]

The working class of the amplifier affects efficiency. Class of the amplifier is dictated by the conduction angle.
For example:
Class A is the most linear but has minimum efficiency (theoretically max 50%), and conduction angle 360 degrees.
Class B has a maximum of 72% efficiency for conduction angle aprox 180 degrees.
Class C is the most nonlinear but most efficient, aprox 85% for a conduction angle less than 180 degrees. A class C amplifier can run in compression.
Check for books from Cripps or Albulet about RF power amplifiers.