Title :
A novel power dependent input distribution network for Doherty amplifier efficiency improvement
Author :
Li, Q. ; Luo, Y.L. ; Zha, J.H. ; Liu, J.Q.
Author_Institution :
RIEST, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
This paper researches on the effect of input network on performance of power added efficiency (PAE) in a Doherty circuit. A new technique based on an adaptive input-power distribution is introduced to overcome the limitations of practical Doherty power amplifiers. The extended-resonance divider is designed by exploiting the peaking amplifier´s nonlinear input impedance, so that more power can be delivered to the carrier and peaking amplifiers in the low and high power regions, respectively. Therefore, the two amplifiers are efficiently driven and can generate output current and voltage characteristics similar to the ideal Doherty amplifier. The PAE of the new Doherty amplifier is improved by 2%-3% compared with a conventional design through simulations as a result.
Keywords :
power amplifiers; Doherty circuit; Doherty power amplifier efficiency; PAE; adaptive input-power distribution; carrier amplifier; current characteristic; extended-resonance divider; nonlinear input impedance; peaking amplifier; power added efficiency; power dependent input distribution network; voltage characteristic; Impedance; Linearity; Power amplifiers; Power dividers; Power transmission lines; Shunt (electrical); Wireless communication; Doherty power amplifier; PAE; extended-resonance power-divider;
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.2012.6238107
