Title :
An analog predistortion integrated circuit for linearizing power amplifiers
Author :
Rahkonen, Timo ; Kankaala, Tapio
Author_Institution :
Electron. Lab., Oulu Univ., Finland
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;
Conference_Titel :
Circuits and Systems, 1998. Proceedings. 1998 Midwest Symposium on
Conference_Location :
Notre Dame, IN
Print_ISBN :
0-8186-8914-5
DOI :
10.1109/MWSCAS.1998.759535
