Title :
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
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;
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
DOI :
10.1109/MMWCST.2012.6238106
