A Transistor-Based Analog Predistorter With Unequal Delays for Memory Compensation

Author

Lee, Yong-Sub ; Lee, Mun-Woo ; Kam, Sang-Ho ; Jeong, Yoon-Ha

Author_Institution

Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang, South Korea

Volume

19

Issue

11

fYear

2009

Firstpage

743

Lastpage

745

Abstract

A transistor-based analog predistorter (APD) with memory effect compensation is represented. The nonlinearity of a gain amplifier generated by a low supply voltage is used as an error generator. The predistorted signal by the unequal-delayed nonlinear paths improves the linearity by compensating for memory effects of the power amplifier (PA). For verification, the proposed APD with three-branch nonlinear paths is implemented with a 30-W class-AB PA and tested using two-tone and various wideband code division multiple access (WCDMA) signals at 2.14 GHz. From the measured results, the proposed APD significantly improves the linearity of the PA with memory effects.

Keywords

UHF power amplifiers; analogue circuits; code division multiple access; delays; distortion; WCDMA; error generator; frequency 2.14 GHz; gain amplifier; memory effect compensation; power 30 W; power amplifier; transistor-based analog predistorter; unequal-delayed nonlinear paths; wideband code division multiple access; Analog predistorter (APD); delay; linearity; memory effects; power amplifier (PA);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2009.2032024

Filename

5290000