[SOLVED] What is Deep class AB?

[hunas2127]

While reading a paper on GaN power amplifiers, I often come across the term "deep class AB" instead of the usual class AB.
I'm curious about the difference between a typical class AB and deep class AB.

 

[Midas245]

I have seen that term referencing a bias point closer to Class B biasing vs the standard "midpoint" type biasing between A and B, without going into Class B operation.

 

[mtwieg]

Probably just a slang term for using a conduction angle close to 180 degrees. Not very useful slang IMO.

 

[ahsrabrifat]

View attachment 198499
While reading a paper on GaN power amplifiers, I often come across the term "deep class AB" instead of the usual class AB.
I'm curious about the difference between a typical class AB and deep class AB.

Deep class AB is a class AB amplifier that operates at high frequencies. It's designed to have high efficiency and power output.

https://mpra.ub.uni-muenchen.de/86867/1/MPRA_paper_86867.pdf

 

[D.A.(Tony)Stewart]

Class B is high distortion and A is more linear but low efficiency so deep AB means more like Class A with a higher minimum current to improve linearity.
But the method employed seems to also match the impedance of harmonics to improve stability factor and PAE while reducing input levels with a deep AB front-end with 2 other stages to increase Pout > , PAE and lower distortion with > 10 dB gain. Bravo Iranian students.