A CMOS fully-differential bandpass /spl Sigma//spl Delta/ modulator using switched-current circuits
作者： J.M. de la Rose , F. Medeiro , B. Perez-Verdu , A. Rodriguez-Vazquez
DOI: 10.1109/MWSCAS.1995.510196
关键词:
摘要: This paper presents a fourth-order bandpass sigma-delta modulator that has been designed using fully-differential switched-current circuits in 0.8 /spl mu/m CMOS technology. The prototype obtained by applying lowpass to transformation (z/sup -1/->-z/sup -2/) second-order Sigma//spl Delta/ modulator. Specifications are SNR/spl ges/60dB@2.5MHz/spl plusmn/15kHz, for clock frequency of 10 MHz. Preliminary results from the fabricated obtains correct noise shaping up 2.5 MHz frequency.
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