A Doherty power amplifier with an improved π-type output network

Author

Zha, J.H. ; Luo, Y.L. ; Li, Q. ; Liu, J.Q.

Author_Institution

RIEST, Univ. of Electron. Sci. & Technol. of China Chengdu, Chengdu, China

fYear

2012

fDate

19-20 April 2012

Firstpage

1

Lastpage

4

Abstract

In this paper, works are focused on the impact of output network on PAE (power-added-efficiency) performance of a Doherty circuit. A shunt capacitor π-network is put forward to improve the output network of Doherty amplifier, based on the equivalent quarter wavelength transmission line. The analysis for this amplifier is presented. A Doherty circuit with applying the improved output network is designed, fabricated and tested. The device used is MRF6S21050L LDMOS. The PAE tested of the Doherty circuit gets 2% improvement in the power backoff region. When ACLR is -30dBc, the corresponding output power measured is 43.5dBm and the drain efficiency measured is 45.75%. All these measured data show very good agreements with the simulated ones.

Keywords

MOS integrated circuits; power amplifiers; power capacitors; π-type output network; ACLR; Doherty circuit; Doherty power amplifier; MRF6S21050L LDMOS; PAE; drain efficiency; equivalent quarter wavelength transmission line; power-added-efficiency; shunt capacitor π-network; Capacitors; Impedance; Linearity; Power amplifiers; Power generation; Power measurement; Radio frequency; Doherty power amplifier; equivalent load network; phase compensation;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Circuits and System Technology (MMWCST), 2012 International Workshop on

Conference_Location

Chengdu

Print_ISBN

978-1-4673-1893-8

Type

conf

DOI

10.1109/MMWCST.2012.6238106

Filename

6238106