A 13.5mW, 185 MSample/s /spl Delta//spl Sigma/-modulator for UMTS/GSM dual-standard IF reception

To accommodate drastically different symbol rates, signal bandwidth and SNR requirements between WCDMA and GSM, the IF frequency, sample-rate and converter architecture are optimized for a dual-standard /spl Sigma//spl Delta/ modulator. In the system and circuit design, attention is given to low power consumption to achieve 13.5 mW at 18 MSample/s. Measured dynamic range is 53 dB for WCDMA and 84 dB for GSM.

[1]  Qiuting Huang,et al.  GSM transceiver front-end circuits in 0.25-/spl mu/m CMOS , 1999 .

[2]  F. O. Eynde,et al.  A high-speed CMOS comparator with 8-b resolution , 1992 .

[3]  J. Huijsing,et al.  A 1.8-mW CMOS /spl Sigma//spl Delta/ modulator with integrated mixer for A/D conversion of IF signals , 2000, IEEE Journal of Solid-State Circuits.

[4]  L. Longo,et al.  A cellular analog front end with a 98 dB IF receiver , 1994, Proceedings of IEEE International Solid-State Circuits Conference - ISSCC '94.

[5]  E.J. van der Zwan,et al.  A 10.7-MHz IF-to-baseband /spl Sigma//spl Delta/ A/D conversion system for AM/FM radio receivers , 2000, IEEE Journal of Solid-State Circuits.

[6]  K.-D. Tiepermann.  Understand the basics of WCDMA signal generation , 1998 .

[7]  G. Geelen,et al.  A fast-settling CMOS op amp for SC circuits with 90-dB DC gain , 1990 .

[8]  C.A. Laber,et al.  A family of differential NMOS analog circuits for a PCM codec filter chip , 1982, IEEE Journal of Solid-State Circuits.

[9]  A.A. Abidi,et al.  Power-conscious design of wireless circuits and systems , 2000, Proceedings of the IEEE.

[10]  J. M. Khoury,et al.  A 400-Ms/s frequency translating bandpass sigma-delta modulator , 1999, IEEE J. Solid State Circuits.

[11]  Willy Sansen,et al.  Distortion in elementary transistor circuits , 1999 .

[12]  Hannu Tenhunen,et al.  Design of stable high order 1-bit sigma-delta modulators , 1990, IEEE International Symposium on Circuits and Systems.

[13]  Thomas Burger,et al.  On the optimum design of regulated cascode operational transconductance amplifiers , 1998, Proceedings. 1998 International Symposium on Low Power Electronics and Design (IEEE Cat. No.98TH8379).

[14]  K. Kaviani,et al.  A two-path bandpass /spl Sigma//spl Delta/ modulator with extended noise shaping , 2000, 2000 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.00CH37056).

[15]  Johan H. Huijsing,et al.  A 1.8-mW CMOS sigma delta modulator with integrated mixer for A/D conversion of IF signals , 2000 .

[16]  B.A. Wooley,et al.  A two-path bandpass sigma-delta modulator with extended noise shaping , 2000, IEEE Journal of Solid-State Circuits.