带片上D/A转换器的WCDMA基站多载波qam调制器

Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169) Pub Date : 2001-05-06 DOI:10.1109/CICC.2001.929784

M. Kosunen, J. Vankka, M. Waltari, K. Halonen

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引用次数: 10

摘要

设计了一种用于宽带码分多址(WCDMA)基站的多载波QAM调制器。多载波调制器对四个基带I和Q数据流进行脉冲整形滤波。输入数据分四个阶段内插，每个阶段内插倍数为2。采用基于CORDIC的数控振荡器(nco)产生4个独立载波并对其进行调制，并将其相加形成一个多载波WCDMA信号。通过反sinc预失真滤波器可以消除D/ a转换器的sinc衰减效应。多载波信号通过集成在同一硅芯片上的14位电流导向D/ a转换器转换到模拟域。实现该芯片采用的工艺是0.35 /spl μ m的BiCMOS工艺。然而，只使用CMOS晶体管。

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

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 /spl mu/m BiCMOS process. However, only CMOS transistors are used.

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Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169)

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