用于基带处理的次采样σ - δ调制器

Proceedings of the IEEE 2002 Custom Integrated Circuits Conference (Cat. No.02CH37285) Pub Date : 2002-08-07 DOI:10.1109/CICC.2002.1012796

Srinivasaraman Chandrasekaran, W. Black

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引用次数: 8

摘要

开发了一种用于直接转换接收机(DCR)基带处理的SD调制器。一个二阶SD调制器与子采样混频器，在反馈回路内，将输入的射频信号直接下变频到基带，数字化并衰减噪声和干扰。在TSMC 0.25 /spl mu/m工艺下制作了用于CDMA2000收发器的原型。对于单端基带输入，测量到的信噪比大于53 dB，对于900 MHz的差分输入，在2 MHz带宽下测量到的信噪比/次最大值/为32 dB。

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Sub-sampling sigma-delta modulator for baseband processing

A sigma-delta (SD) modulator has been developed for baseband processing in a direct conversion receiver (DCR). A second-order SD modulator with a subsampling mixer, inside the feedback loop, down-converts the incoming RF signals directly to baseband, digitizes them and attenuates noise as well as interferers. A prototype was fabricated in a TSMC 0.25 /spl mu/m process for use in a CDMA2000 transceiver. SNR greater than 53 dB was measured for single-ended baseband inputs and a SNR/sub max/ of 32 dB was measured for differential inputs at 900 MHz, over a 2 MHz bandwidth.

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Proceedings of the IEEE 2002 Custom Integrated Circuits Conference (Cat. No.02CH37285)

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