Linear high-efficiency microwave power amplifiers using bandpass delta-sigma modulators

Author

Jayaraman, Arun ; Chen, P.F. ; Hanington, G. ; Larson, L. ; Asbeck, P.

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA

Volume

8

Issue

3

fYear

1998

fDate

3/1/1998 12:00:00 AM

Firstpage

121

Lastpage

123

Abstract

A novel amplifier configuration is described, in which a bandpass delta-sigma modulator is used to produce a two-level (digital) signal representing an analog radio frequency (RF) input. Subsequently, a switching-mode amplifier and bandpass filter are used to amplify the signal and remove unwanted spectral components. This configuration has the potential of achieving high efficiency (typical of switching mode amplifiers) together with high linearity. A simulated implementation with GaAs heterojunction bipolar transistors (HBT) is shown

Keywords

band-pass filters; microwave power amplifiers; sigma-delta modulation; switching circuits; GaAs; GaAs HBT; analog RF input; bandpass delta-sigma modulators; bandpass filter; heterojunction bipolar transistors; linear high-efficiency amplifiers; microwave power amplifiers; switching-mode amplifier; two-level signal; Band pass filters; Delta modulation; Digital modulation; Heterojunction bipolar transistors; High power amplifiers; Linearity; Microwave amplifiers; RF signals; Radio frequency; Radiofrequency amplifiers;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.661135

Filename

661135