A digital quadrature modulator with on-chip D/A converter

Author

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

Author_Institution

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

fYear

2003

fDate

16-18 Sept. 2003

Firstpage

85

Lastpage

88

Abstract

A digital quadrature modulator is presented that can replace the first analog IF mixer stage of a base station transmitter. It interpolates orthogonal input carriers by 16 and performs digital quadrature modulation at carrier frequencies f/sub s//4, - f/sub s//4 and - f/sub s//2. A 12-bit D/A converter are integrated on-chip using segmented current source architecture and a proper switching technique to reduce spurious components and to enhance dynamic performance. The modulator is designed to fulfil the spectral, phase, and EVM specifications of GSM, EDGE and WCDMA base stations.

Keywords

analogue-digital conversion; quadrature amplitude modulation; transmitters; EDGE base station; GSM base station; WCDMA base stations; analog IF mixer; base station transmitter; digital quadrature modulator; on-chip D-A converter; orthogonal input carriers; segmented current source architecture; switching technique; Base stations; Baseband; Digital modulation; Electronic circuits; Frequency; Hardware; Pulse modulation; Sampling methods; Transmitters; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European

Conference_Location

Estoril, Portugal

Print_ISBN

0-7803-7995-0

Type

conf

DOI

10.1109/ESSCIRC.2003.1257078

Filename

1257078