Analysis of inverse E class power amplifier with finite DC feed in sub-nominal condition

Abstract

In this work an inverse E power amplifier with finite DC feed in sub-nominal condition is discussed. In the conventional inverse E the DC feed inductor is considered very large which imposes some conditions to the circuit such as constant current drawn from voltage supply and also a large value for inductance is hard to implement on-chip so this work removes the very large condition from DC feed inductance and proposes a finite DC feed for the structure and extracts the circuit parameters and design equations with regards to this matter. Furthermore to achieve a flexible design this work uses the phase shift between input and output voltages to control efficiency, peak switch voltage and peak switch current then the value of circuit elements and the tradeoffs for every choice are discussed in details and a design guideline is presented for achieving different goals in a finite DC feed inverse E PA. Finally the circuit is simulated in the 0.18 µm CMOS technology and the results are being verified.