Bandpass ∑△ modulator employing undersampling of RF signals for wireless communication

Aziza I. Hussein; William B. Kuhn

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Bandpass ∑△ modulator employing undersampling of RF signals for wireless communication

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摘要

The rapid development of digital wireless systems has led to a need for high-resolution and high-speed bandpass analog-to-digital converters. Continuous-time bandpass ∑△ modulators are very suitable for such high frequency applications. In this paper, analysis and simulation of a continuous-time bandpass ∑△ modulator for use in modern cellular/PCS receivers is given. The design employs undersampling relative to a radio receiver's radio frequency (RF) or intermediate frequency (IF) center frequency, while oversampling the signal bandwidth. This technique enables clocking at a frequency much lower than the RF/IF frequency, allowing use of standard CMOS technology and reducing the complexity and power consumption of subsequent digital signal processing stages. The analysis shows that it is possible to achieve a loop transfer function that matches a standard discrete-time bandpass ∑△ modulator while operating at sample rates significantly lower than conventional bandpass architectures.

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《IEEE Transactions on Automatic Control》 |2000年第7期|614-620|共7页
作者
Aziza I. Hussein; William B. Kuhn;
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原文格式 PDF
正文语种英语
中图分类自动化系统;
关键词
Analog-to-digital; Bandpass; Data conversion; Receiver; Sigma-delta modulation;

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Bandpass ∑△ modulator employing undersampling of RF signals for wireless communication

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