Linearization of mixers using predistortion and envelope signal injection

Author

Chan, Walter H Y ; Böck, Georg

Author_Institution

Vtech Telecommun. Ltd., Hong Kong, China

Volume

14

Issue

3

fYear

2004

fDate

3/1/2004 12:00:00 AM

Firstpage

100

Lastpage

102

Abstract

This letter presents a new linearization method for mixers employing predistortion and envelope signal injection. In this technique the third order intermodulation distortion (IM3), at the output of a mixer in IF band, was cancelled by using a diode predistortor and injecting the envelope of the RF input signal to both the predistortor and the mixer. By properly adjusting the amplitude and polarity of the injected envelope signal, up to 26 dB improvement of the IM3 is obtained in a two tone test with 100 kHz separation at 1.9 GHz. This method operates very well over a wide range of output power up to the 1 dB compression point of the mixer.

Keywords

MESFET integrated circuits; UHF integrated circuits; intermodulation distortion; linearisation techniques; mixers (circuits); 1.9 GHz; IF band mixer; RF input signal; amplitude; compression point; diode predistortor; envelope signal injection; linearization; mixers; output power; polarity; predistortion; third order intermodulation distortion; two tone test; Diodes; Dynamic range; Intermodulation distortion; Linearity; Power amplifiers; Predistortion; RF signals; Radio frequency; Radiofrequency amplifiers; Signal generators;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2004.825168

Filename

1278380