A multicarrier QAM-modulator for WCDMA basestation with on-chip D/A converter

Author

Kosunen, Marko ; Vankka, Jouko ; Waltari, Mikko ; Halonen, Kari

Author_Institution

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

fYear

2001

fDate

2001

Firstpage

301

Lastpage

304

Abstract

A multicarrier QAM modulator for a wideband code division multiple access (WCDMA) basestation has been designed. The multicarrier modulator performs pulse shaping filtering for four baseband I and Q data streams. Input data is interpolated in four stages each interpolating by a factor two. Four independent carriers are generated and modulated with the CORDIC based numerically controlled oscillators (NCOs) and summed up to form a multicarrier WCDMA signal. SINC-attenuation effect of a D/A converter is canceled by an inverse-SINC predistortion filter. The multicarrier signal is converted to the analog domain with a 14-bit current steering D/A converter which is integrated on the same silicon chip. Process used in realization of the chip is a 0.35 μm BiCMOS process. However, only CMOS transistors are used

Keywords

BiCMOS integrated circuits; cellular radio; code division multiple access; digital-analogue conversion; modulators; quadrature amplitude modulation; 0.35 micron; 14 bit; BiCMOS process; CORDIC based numerically controlled oscillators; SINC-attenuation effect; WCDMA basestation; current steering D/A converter; inverse-SINC predistortion filter; multicarrier QAM-modulator; on-chip D/A converter; pulse shaping filtering; Baseband; Filtering; Modulation coding; Multiaccess communication; Oscillators; Pulse modulation; Pulse shaping methods; Quadrature amplitude modulation; Signal generators; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits, 2001, IEEE Conference on.

Conference_Location

San Diego, CA

Print_ISBN

0-7803-6591-7

Type

conf

DOI

10.1109/CICC.2001.929784

Filename

929784