Quantization analysis and design of a digital predistortion linearizer for RF power amplifiers

Author

Sundström, Lars ; Faulkner, Michael ; Johansson, Mats

Author_Institution

Dept. of Appl. Electron., Lund Univ., Sweden

Volume

45

Issue

4

fYear

1996

fDate

11/1/1996 12:00:00 AM

Firstpage

707

Lastpage

719

Abstract

Significant improvements in terms of reduced power consumption and increased bandwidth are obtained if a digital predistortion linearizer is implemented with an application specific digital signal processor. This paper investigates the quantization effects in different parts of a table based complex gain predistortion linearizer. The analysis can be used to optimize the predistortion linearizer with respect to word length based on the knowledge of the RF amplifier gain characteristic, the probability density function for the modulation scheme and the maximum allowable adjacent channel interference level. A predistorter chip is described that has been designed using the analysis. The chip has been fabricated and tested. Compared with a standard digital signal processing (DSP) solution it provides seven times higher bandwidth but consumes only 10% of the power

Keywords

CMOS digital integrated circuits; application specific integrated circuits; circuit optimisation; digital signal processing chips; integrated circuit design; integrated circuit testing; linearisation techniques; power amplifiers; radio transmitters; radiofrequency amplifiers; table lookup; 1.0 micron; 10 to 15 MHz; RF power amplifiers; application specific digital signal processor; bandwidth; design; digital predistortion linearizer; gain characteristic; maximum allowable adjacent channel interference level; modulation scheme; optimization; power consumption; predistorter chip; probability density function; quantization analysis; table based complex gain predistortion linearizer; word length; Bandwidth; Digital signal processing chips; Digital signal processors; Energy consumption; Interchannel interference; Predistortion; Probability density function; Quantization; Radiofrequency amplifiers; Testing;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.543741

Filename

543741