Title :
80 MHz bandpass delta-sigma modulator using switched-capacitor resonator structure
Author :
Salo, T. ; Lindfors, S. ; Halonen, K.
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
fDate :
7/5/2001 12:00:00 AM
Abstract :
A fully differential 80 MHz fourth-order bandpass ΔΣ modulator, meant for a 100 MHz GSM/WCDMA multimode IF receiver, is presented. The modulator is based on a double-delay single opamp SC-resonator structure which is well suited for low supply voltages. Furthermore, the centre frequency of the topology is insensitive to different component variances. The measured peak SNR is 78 dB and 43.3 dB for 270 kHz (GSM) and 3.84 MHz (WCDMA) bandwidths, respectively
Keywords :
CMOS integrated circuits; analogue-digital conversion; cellular radio; code division multiple access; delta-sigma modulation; high-speed integrated circuits; modulators; switched capacitor networks; 100 MHz; 270 kHz; 3.84 MHz; 43.3 dB; 78 dB; 80 MHz; GSM/WCDMA multimode IF receiver; bandpass delta-sigma modulator; double-delay single opamp SC-resonator structure; fourth-order ΔΣ modulator; fully differential ΔΣ modulator; high resolution ADC; low supply voltages; switched-capacitor resonator; wideband CDMA;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20010599
