Second harmonic zone injection for amplifier linearisation

Author

Nesimoglu, Tayfun ; Wilkinson, Ross J. ; Canagarajah, C.N. ; McGeehan, J.P.

Author_Institution

Centre for Commun. Res., Bristol Univ., UK

Volume

3

fYear

1999

fDate

36342

Firstpage

2353

Abstract

Second harmonic zone (SHZ) injection is a feedback technique for reducing the intermodulation distortion (IMD) at the output of an amplifier, which is based on feeding the SHZ intermodulation products (IMP), back to the amplifier´s input. The technique is analyzed theoretically and practical results demonstrate the linearisation performance. Two feedback prototypes were built, one using a frequency doubler and the other using a buffer amplifier as a distorter, where 14 dB and 13 dB improvement was obtained respectively in reducing the third order IMP (IMP₃). The performance of the technique with changing frequency and input power level was also investigated

Keywords

buffer circuits; feedback amplifiers; frequency multipliers; harmonic analysis; intermodulation distortion; land mobile radio; linearisation techniques; power amplifiers; radio transmitters; radiofrequency amplifiers; RF power amplifier; amplifier input; amplifier linearisation; amplifier output; buffer amplifier; distorter; feedback prototypes; feedback technique; frequency doubler; input power level; intermodulation distortion reduction; intermodulation products; linear transmitter; linearisation performance; mobile communication systems; second harmonic zone injection; spectral efficiency; third order IMP reduction; wireless communication systems; Bandwidth; Circuits; Crosstalk; Distortion; Feedback; Frequency; Power amplifiers; Prototypes; Signal generators; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1999 IEEE 49th

Conference_Location

Houston, TX

ISSN

1090-3038

Print_ISBN

0-7803-5565-2

Type

conf

DOI

10.1109/VETEC.1999.778491

Filename

778491