Title :
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
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;
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
DOI :
10.1109/ISSCC.2002.993014
