A triple-mode continuous-time ΣΔ modulator with switched-capacitor feedback DAC for a GSM-EDGE/CDMA2000/UMTS receiver

被引：85

作者：

van Veldhoven, RHM ^{[1
]}

机构：

[1] Philips Res Labs, NL-5656 AA Eindhoven, Netherlands

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2003年 / 38卷 / 12期

关键词：

mobile communication; telecommunication receiver; intermediate frequency (IF) conversion; GSM; EDGE; CDMA2000; UMTS; sigma-delta analog-to-digital converter (ADC); sigma-delta modulator; switched-capacitor (SC) digital-to-analog; converter (DAC); reduced jitter sensitivity;

D O I：

10.1109/JSSC.2003.819165

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：

Time jitter in continuous-time SigmaDelta modulators is a known limitation on the maximum achievable signal-to-noise-ratio (SNR). Analysis of time jitter in this type of converter shows that a switched-capacitor (SC) feedback digital-to-analog converter (DAC) reduces the sensitivity to time jitter significantly. In this paper, an I and Q continuous-time fifth-order SigmaDelta modulator with 1-bit quantizer and SC feedback DAC is presented, which demonstrates the improvement in maximum achievable SNR when using an SC instead of a switched-current (SI) feedback circuit. The modulator is designed for a GSM/CDMA2000/UMTS receiver and achieves a dynamic range of 92/83/72 dB in 200/1228/3840 kHz, respectively. The intermodulation distance IM2, 3 is better than 87 dB in all modes. Both the I and Q modulator consumes a power of 3.8/4.1/4.5 mW at 1.8 V. Processed in 0.18-mum CMOS, the 0.55-mm(2) integrated circuit includes a phase-locked loop, two oscillators, and a bandgap.

引用

页码：2069 / 2076

页数：8

共 6 条

[1] A 13.5-mW 185-Msample/s ΔΣ modulator for UMTS/GSM dual-standard IF reception [J].

Burger, T ;

Huang, QT .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2001, 36 (12) :1868-1878

[2]

Ortmanns M., 2002, P EUR SOL STAT CIRC, P287

[3]

SALO T, 2002, ISSCC, V45, P218

[4] A 10.7-MHz IF-to-baseband ΣΔ A/D conversion system for AM/FM radio receivers [J].

van der Zwan, EJ ;

Philips, K ;

Bastiaansen, CAA .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2000, 35 (12) :1810-1819

[5] A 0.2-mW CMOS Sigma Delta modulator for speech coding with 80 dB dynamic range [J].

vanderZwan, EJ ;

Dijkmans, EC .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 1996, 31 (12) :1873-1880

[6]

VANVELDHOVEN R, 2002, ISSCC 2002, P222

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