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80 MHz bandpass delta-sigma modulator using switched-capacitor resonator structure

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3 Author(s)
T. Salo ; Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland ; S. Lindfors ; K. Halonen

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

Published in:

Electronics Letters  (Volume:37 ,  Issue: 14 )