Title: Push-Pull Class-E Power Amplifier with a Simple Load Network Using an Impedance Matched Transformer

Year of Publication: Nov - 2014
Page Numbers: 21-25
Authors: Jinhee Kwon, Hwiseob Lee, Wooseok Lee, Mincheol Seo, Youngoo Yang
Conference Name: The International Conference on Electrical, Electronics, Computer Engineering and their Applications (EECEA2014)
- Malaysia

Abstract:


This paper presents a push-pull class-E power amplifier based on a simple load network using the impedance matched transformer. The proposed load network consists of an impedance matched transformer and series LC filter. The transformer which is made of a ferrite core and an enamelcoated wire was used to match to the optimal load impedance as well as to convert a balanced output signal to a single-ended signal. The proposed power amplifier achieved low second harmonic distortion with push-pull structure and low third harmonic using LC filter, which includes a shunt capacitor. The designed and implemented power amplifier showed an efficiency of 83.8% at an output power of 37.4 dBm using 6.78 MHz input signal. At the same output power level, the second and third harmonic distortions are -43.58 dBc and -40.52 dBc, respectively.