In traffic telematic systems (route guidance, fleet Management) vehicle-side terminals are required for the quasi-simultaneous reception of cellular phone (GSM) and satellite navigation (GPS). A conventional approach uses two complete receivers for these two tasks. The authors describe a cost-saving solution for a combined receiver which relies on the TDM structure of the GSM signal. This concept has the potential for a reduction in volume, power consumption and cost compared with the conventional solution. A bandpass SigmaDelta-ADC for digitizing an intermediate frequency of 44 MHz has been realized and tested. The matching of the different stages of the cascaded SigmaDelta modulator will be improved by a redesign. A digital front-end has been realized to adapt the SigmaDelta-modulator output to comrnercially available chip sets for basebandprocessing.
A GSM/GPS receiver with a bandpass sigma-delta analog for digital converter
Ein GSM/GSP-Empfänger mit einem AD-Umsetzer mit Sigma-Delta-Modulation
1999
4 Seiten, 7 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
Improved sigma-delta analog-to-digital converter using time-stretching technique [3795-03]
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