A dual-mode 80 MHz bandpass /spl Delta//spl Sigma/ modulator for a GSM/WCDMA IF-receiver

Author

Salo, T. ; Hollman, T. ; Lindfors, S. ; Halonen, K.

Author_Institution

Helsinki Univ. of Technol., Finland

Volume

1

fYear

2002

fDate

7-7 Feb. 2002

Firstpage

218

Abstract

The authors present a band-pass modulator operating at 80 MHz which combines frequency down-conversion with A/D conversion. The two SC resonators are implemented using a single opamp. A single-bit quantizer and feedback is used for GSM, but 4 b quantizer is used for WCDMA. Measured peak SNRs are 80 dB for 270 kHz B/W (GSM), and 48 dB for 3.84 MHz B/W (WCDMA).

Keywords

CMOS integrated circuits; analogue-digital conversion; cellular radio; delta-sigma modulation; modulators; radio receivers; switched capacitor networks; 0.35 micron; 24 mW; 270 kHz; 3.84 MHz; 38 mW; 48 dB; 60 MHz; 80 MHz; 80 dB; CMOS technology; GSM standard; GSM/WCDMA IF-receiver; SC resonators; WCDMA standard; bandpass /spl Delta//spl Sigma/ modulator; delta-sigma modulator; dual-mode modulator; feedback; four bit quantizer; fully-differential SC circuit; mobile phones; single-bit quantizer; switched-capacitor circuit; wideband CDMA; Band pass filters; Bandwidth; Capacitance; Capacitors; Clocks; Feedback; GSM; Multiaccess communication; Quantization; Sampling methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2002. Digest of Technical Papers. ISSCC. 2002 IEEE International

Conference_Location

San Francisco, CA, USA

Print_ISBN

0-7803-7335-9

Type

conf

DOI

10.1109/ISSCC.2002.993014

Filename

993014