학술논문
A novel inverse class-D output matching network and its application to dynamic load modulation
Document Type
Conference
Source
2010 IEEE MTT-S International Microwave Symposium Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International. :1-1 May, 2010
Subject
Language
ISSN
0149-645X
Abstract
Summary form only given. This paper presents a new inverse class-D output matching network suitable for dynamic load modulation. The proposed matching network can synthesis the optimum load impedance at the fundamental as well as the necessary terminations at the 2 nd and the 3 rd harmonic, additionally it allows separate control over the imaginary and real part of the admittance at the fundamental. For load modulation applications an adaptive λ/4 line will be presented. An inverse class-D GaN power amplifier at 1 GHz based on the new output matching network is designed and measured. The measured amplifier has a maximum power added efficiency of 74 % and maximum output power of 40 dBm. Through using the adaptive λ/4 line the amplifier can achieve a PAE of more than 50 % at an output power of 32 dBm, which gives an efficiency improvement of more than 25 % over an 8 dB output dynamic range.