Complex-signal sigma-delta modulators for quadrature bandpass A/D conversion

被引：5

作者：

Dias, VD

机构：

[1] INESC, 1017 Lisboa-Codex, Rua Alves Redol 9

来源：

MICROELECTRONICS JOURNAL | 1996年 / 27卷 / 06期

关键词：

D O I：

10.1016/0026-2692(95)00114-X

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：

This paper presents a study on complex-signal sigma-delta (Sigma Delta) modulators suitable for quadrature bandpass analogue-to-digital conversion of signals in monolithic radio receivers. The noise-shaping in complex-signal modulators is not symmetric with respect to de, i.e. the zeros in the noise transfer function are not complex-conjugate as in conventional bandpass modulators. First-order (L = 1), second-order (L = 2) and high-order (L > 2) cascade topologies are discussed together with design methodologies suitable for switched-capacitor (SC) realization. Complex-signal fully-differential SC integrators and sigma-delta modulators are also addressed. The concepts, design methodologies and circuits proposed have been validated through simulations made with TOSCA (V. Literali et al., IEEE Trans. CAD Integrated CAS, 12(9) (1993) 1376-1386) and SWITCAP-2 (K. Suyams et al., IEEE J. Solid-State Circuits, 25(6) (1990) 1403-1413). (C) 1996 Elsevier Science Ltd.

引用

页码：505 / 524

页数：20

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