High efficiency power transmitter based on envelope delta-sigma modulation (EDSM)

Author

Dupuy, Alexandre ; Wang, Yuanxun Ethan

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

3

fYear

2004

fDate

26-29 Sept. 2004

Firstpage

2092

Abstract

A delta-sigma modulated Class-E power amplifier is proposed and experimentally developed for high-efficiency and linear applications. The essential idea is based on envelope delta-sigma modulation (EDSM), which combines the Kahn technique envelope elimination and restoration (EER) and the delta-sigma modulated amplifier concept. The EDSM scheme increases the efficiency of the circuit by digitizing the envelope of the signal instead of the original RF signal. In the proposed scheme, the digitized envelope is not filtered as in the Kahn technique; consequently the output signal linearity is not deteriorated by the amplifier nonlinearity. A band pass filter is used only at the output of the system after the Class-E power amplifier to restore the original signal envelope.

Keywords

band-pass filters; delta-sigma modulation; power amplifiers; radio transmitters; Kahn technique; amplifier nonlinearity; band pass filter; delta-sigma modulated Class-E power amplifier; digitized envelope; envelope delta-sigma modulation; envelope elimination and restoration; envelope restoration; high efficiency power transmitter; signal envelope; Band pass filters; Circuits; Delta modulation; Delta-sigma modulation; High power amplifiers; Linearity; RF signals; Radiofrequency amplifiers; Signal restoration; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th

ISSN

1090-3038

Print_ISBN

0-7803-8521-7

Type

conf

DOI

10.1109/VETECF.2004.1400409

Filename

1400409