Design of a continuous-time Gm-C bandpass delta-sigma modulator

被引：0

作者：

Matsuura, K ^{[1
]}

Waho, T ^{[1
]}

机构：

[1] Sophia Univ, Dept Elect & Elect Engn, Tokyo 1028554, Japan

来源：

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS | 2004年 / 87卷 / 03期

关键词：

bandpass Delta Sigma modulator; A-D converter; continuous time; HEMT;

D O I：

10.1002/ecjb.10168

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A second-order continuous-time bandpass DeltaSigma modulator using HEMTs (High-Electron-Mobility Transistors) is designed and its performance characteristics such as SNR (Signal-to-Noise Ratio) are evaluated by SPICE simulation. For high-speed operation of the modulator, the bandpass DeltaSigma scheme, which can reduce the quantization noise at high-frequency regions, and the continuous-time scheme using a continuous-time filter as a loop filter are employed. First, the bandpass filter, quantizer, and D-A converter are designed. Next, the modulator formed by combination of these is simulated. Excellent performance is obtained with an SNR = 44 dB (corresponding to a resolution of 7.0 bits) with a bandwidth of 32 MHz and with SNR = 52 dB (8.3 bits) at 8 MHz. (C) 2004 Wiley Periodicals, Inc.

引用

页码：39 / 44

页数：6

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