Title :
Improvement of Doherty amplifier efficiency with new low-pass filter using Photonic Bandgap characteristics
Author :
Jung, Duwon ; Cho, Junkyung
Author_Institution :
R&D Center, Eltronix Co., Inc., Seoul, South Korea
Abstract :
In this paper, the power added efficiency (PAE) of a Doherty amplifier has been improved by applying Photonic Bandgap (PBG) characteristics on the output of amplifier. The new low-pass filter (LPF) using PBG characteristics is adopted on the output offset transmission lines. As a result of the high order harmonics termination, excellent improvement in PAE, maximum output power as well as linearity is obtained. The PAE is improved as much as relatively 35% compared with a conventional Doherty power amplifier. Moreover, size of LPF is reduced by PBG characteristics. Therefore the whole amplifier circuit size is considerably reduced by diminishing in size of the LPF as compared with a Doherty amplifier using conventional LPFs.
Keywords :
amplifiers; low-pass filters; photonic band gap; Doherty amplifier efficiency; LPF; PAE; PBG characteristic; amplifier circuit size; high order harmonics termination; low-pass filter; output offset transmission line; photonic bandgap characteristic; power added efficiency; Couplings; Harmonic analysis; Microwave filters; Power amplifiers; Power generation; Power harmonic filters; Power transmission lines; Doherty amplifier; Low-pass filter; Photonic bandgap; Power added efficiency;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5
