Looking for info about class-G amplifiers

Hi, everyone!

I need some help. I'm funding some information (books or articles ) about design of amplifier class-G. It's will be used in transmitter class G. What can you recommend me?

Thanks.

Class G amplifier is working with 4 power supplies (+/- VCC1,VCC2). And the basic idea is when the output swing is small, the transistors just use the smaller supply (+/- VCC1) and if the output swing is larger than the smaller supply (swing>VCC1) then they are also using the VCC2.

But I have never seen class G in RF transmitter.