Analysis and simulation of low-frequency feed-forward linearization

Author

Yu, Shuang ; Roblin, Patrick

Author_Institution

Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA

Volume

2

fYear

2001

fDate

2001

Firstpage

789

Abstract

Theoretical analysis and simulation results of low-frequency feed-forward linearization are presented. A new constraint is demonstrated to be required to simultaneously cancel the upper and lower IMD3 frequencies generated by third-order intermodulation distortion. This constraint is independent from the low-frequency feed-forward signal but can be satisfied by adjusting the DC bias point. Simulations for a two-tone signal in the AMPS band, in a LDMOSFET power RF amplifier, demonstrate that a reduction of at least 20 dB in third-order intermodulation distortion can be achieved at either low or high input-power levels

Keywords

feedforward; intermodulation distortion; linearisation techniques; nonlinear network analysis; power amplifiers; radiofrequency amplifiers; AMPS band; DC bias point adjustment; IMD3 frequencies cancellation; LDMOSFET power RF amplifier; LF feedforward linearization; harmonic balance simulations; intermodulation distortion; low-frequency linearization; lower IMD3 frequencies; phase constraint; third-order IMD reduction; two-tone signal; upper IMD3 frequencies; Analytical models; Constraint theory; Feedforward systems; Intermodulation distortion; Intrusion detection; RF signals; Radio frequency; Radiofrequency amplifiers; Signal analysis; Telephone sets;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on

Conference_Location

Dayton, OH

Print_ISBN

0-7803-7150-X

Type

conf

DOI

10.1109/MWSCAS.2001.986305

Filename

986305