Title :
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
fDate :
3/1/1998 12:00:00 AM
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;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
