Transmitter utilising bandpass delta-sigma modulator and switching mode power amplifier

Author

Ketola, Jaakko ; Sommarek, Johan ; Vankka, Jouko ; Halonen, Kari

Author_Institution

Electron. Circuit Design Lab., Helsinki Univ. of Technol., Finland

Volume

1

fYear

2004

fDate

23-26 May 2004

Abstract

In this paper a concept of a transmitter using delta-sigma modulation and switching mode power amplifier is presented. The specifications of a WCDMA base station transmitter are as an objective. Using a delta-sigma modulation in a D/A conversion, most of the nonlinearities of a multi-bit D/A converter are avoided. In addition the 1-bit output signal of the delta-sigma modulator is suitable for power efficient switching mode power amplifiers. The use of the images of the signal is studied as a method to reduce the required sampling frequency. The problems and possible solutions in implementing a wideband transmitter with this topology are discussed as well.

Keywords

code division multiple access; control nonlinearities; delta-sigma modulation; integrated circuit design; modulators; power amplifiers; radio transmitters; switching circuits; D-A conversion; D-A converter nonlinearities; WCDMA base station transmitter; bandpass delta-sigma modulator; delta-sigma modulation; multibit D-A converter; power efficiency; required sampling frequency reduction; signal images; switching mode power amplifier; wideband transmitter implementation; Base stations; Broadband amplifiers; Delta modulation; Delta-sigma modulation; Frequency; Image converters; Image sampling; Multiaccess communication; Power amplifiers; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1328274

Filename

1328274