Title :
A CMOS fully-differential bandpass ΣΔ modulator using switched-current circuits
Author :
de la Rose, J.M. ; Medeiro, F. ; Pérez-Verdú, B. ; Rodríguez-Vázquez, A.
Author_Institution :
Dept. of Analog Design, Centro Nacional de Microelectron., Seville, Spain
Abstract :
This paper presents a fourth-order bandpass sigma-delta modulator that has been designed using fully-differential switched-current circuits in a 0.8 μm CMOS technology. The modulator prototype has been obtained by applying a lowpass to bandpass transformation (z-1 ->-z-2) to a second-order lowpass ΣΔ modulator. Specifications are SNR⩾60dB@2.5MHz±15kHz, for a clock frequency of 10 MHz. Preliminary results from the fabricated prototype obtains the correct noise shaping up to 2.5 MHz clock frequency
Keywords :
CMOS integrated circuits; modulators; sigma-delta modulation; switched current circuits; 10 MHz; 2.5 MHz; 60 dB; CMOS technology; bandpass ΣΔ modulator; fourth-order type; fully-differential configuration; lowpass to bandpass transformation; switched-current circuits; CMOS technology; Clocks; Delta modulation; Feedback; Frequency; Noise shaping; Prototypes; Switching circuits; Transfer functions; Virtual prototyping;
Conference_Titel :
Circuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
0-7803-2972-4
DOI :
10.1109/MWSCAS.1995.510196
