An analog predistortion integrated circuit for linearizing power amplifiers

Author

Rahkonen, Timo ; Kankaala, Tapio

Author_Institution

Electron. Lab., Oulu Univ., Finland

fYear

1998

fDate

9-12 Aug 1998

Firstpage

480

Lastpage

483

Abstract

An analog polynomial distortion circuit is designed for linearizing the response of power amplifiers. The circuit implements a fifth order complex-valued polynomial distortion function that can be used to cancel the intermodulation products created in a non-linear power amplifier. The distortion circuit has a bandwidth of 150 MHz and a modulation bandwidth of 40 MHz. It is intended for baseband or IF applications. Measured results for a class A amplifier show 10 to 30 dB reduction in IM sidebands

Keywords

analogue integrated circuits; intermodulation distortion; linearisation techniques; polynomials; power amplifiers; IF applications; IM products; IM sidebands reduction; analog polynomial distortion circuit; analog predistortion integrated circuit; baseband applications; class A amplifier; complex-valued polynomial distortion function; fifth order polynomial distortion function; intermodulation products; nonlinear power amplifier; power amplifier linearisation; Analog integrated circuits; Bandwidth; Nonlinear distortion; Phase distortion; Power amplifiers; Power measurement; Predistortion; Quadrature phase shift keying; Signal processing; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1998. Proceedings. 1998 Midwest Symposium on

Conference_Location

Notre Dame, IN

Print_ISBN

0-8186-8914-5

Type

conf

DOI

10.1109/MWSCAS.1998.759535

Filename

759535