Hybrid quadrature polar modulator-based transmitter with digital predistorter for simultaneous enhancement of adjacent channel power ratios and power added efficiency (PAE)

Author

Li, Cheng-Jyun ; Chen, Chien-Ting ; Horng, Tzyy-Sheng ; Jau, J.-K. ; Li, Jhin-Yu ; Deng, D.-S.

Author_Institution

Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung

Volume

2

Issue

8

fYear

2008

fDate

12/1/2008 12:00:00 AM

Firstpage

801

Lastpage

812

Abstract

The design and linearisation techniques for a highly efficient but nonlinear Class-E power amplifier (PA) applied to linear RF transmitters are presented. A hybrid quadrature polar modulator (HQPM) is proposed to linearise the Class-E PA. To accomplish this HQPM-based transmitter, the Class-E PA is designed with a consideration of finite DC-feed inductance for a wide supply voltage modulation bandwidth. In addition, a digital predistorter is embedded in the HQPM to provide the predistorted envelope modulation for both RF-input and supply voltage signals fed to the Class-E PA. A cdma2000 1times transmitter incorporating such a Class-E PA and a HQPM have been implemented to serve as an evidence for the simultaneous achievement of high linearity and high efficiency.

Keywords

3G mobile communication; linearisation techniques; modulators; nonlinear distortion; radio transmitters; radiofrequency amplifiers; HQPM-based transmitter; cdma2000; digital predistorter; finite DC-feed inductance; hybrid quadrature polar modulator; linear RF transmitters; linearisation techniques; nonlinear Class-E power amplifier; power added efficiency;

fLanguage

English

Journal_Title

Microwaves, Antennas & Propagation, IET

Publisher

iet

ISSN

1751-8725

Type

jour

DOI

10.1049/iet-map:20070359

Filename

4686781