Paper Info
Title
A 4-mm-Square Miniaturized Doherty Power Amplifier Module for W-CDMA Mobile Terminals
Abstract
Recently, the Doherty amplifier technique has been the focus of attention not only for base stations but also for mobile terminals because of its high power-added efficiency in the large back-off region. In this paper, we present a miniaturized Doherty power amplifier (PA) module for W-CDMA mobile terminals. The developed Doherty PA module consists of a 4-mm-square ceramic substrate (4.0 mm × 4.0 mm × 1.5 mm, alumina, dielectric constant = 8.8), a 1-mm-square GaAs MMIC (1.0 mm × 1.0 mm × 0.1 mm), and 0603-size SMD passive components. To miniaturize the module size, the optimal designed quarter-wavelength transmission lines, which are used for impedance conversion for carrier amplifier output and phase compensation for peak amplifier input, are embedded in the ceramic module substrate. Two GaAs HBTs for a carrier amplifier and a peak amplifier and base bias circuits for each amplifier are integrated onto a single-chip GaAs MMIC. Measurement results at 1950 MHz in a W-CDMA uplink signal indicate that 27 dBm of the maximum output power, 45% of the power-added efficiency (PAE), 11 dB of power gain, and 43% of PAE at 6 dB back-off, i.e. 24 dBm output power, are obtained with the developed Doherty PA. In other words, the PAE is improved from the theoretical PAE of a conventional class B amplifier, namely, from 23% to 43%. This is the smallest Doherty amplifier developed in the form of a module for mobile terminals.
Year
DOI
Venue
2007
10.1093/ietfec/e90-a.2.310
IEICE Transactions
Keywords
Field
DocType
smallest doherty amplifier,carrier amplifier,4-mm-square miniaturized doherty power,carrier amplifier output,peak amplifier input,amplifier module,peak amplifier,conventional class b amplifier,doherty amplifier technique,mobile terminal,ceramic module substrate,w-cdma mobile terminals,doherty power amplifier,w cdma,power amplifier
Power gain,Doherty amplifier,Linear amplifier,Monolithic microwave integrated circuit,RF power amplifier,Electrical engineering,Operational amplifier,Mathematics,Differential amplifier,Amplifier
Journal
Volume
Issue
ISSN
E90-A
2
0916-8508
Citations 
PageRank 
References 
0
0.34
0
Authors
4
Name
Order
Citations
PageRank
Takayuki Kato111.39
Keiichi Yamaguchi201.35
Yasuhiko Kuriyama3102.41
Hiroshi Yoshida4103.96