Design of low-voltage MOSFET-only /spl Sigma//spl Delta/ modulators in standard digital CMOS technology |
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Authors: | Tille T Sauerbrey J Mauthe M Schmitt-Landsiedel D |
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Affiliation: | Inst. of Tech. Electron., Tech. Univ. of Munich, Germany; |
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Abstract: | A design strategy of low-voltage high-linearity MOSFET-only /spl Sigma//spl Delta/ modulators in standard digital CMOS technology is presented. The modulators use substrate-biased MOSFETs in the depletion region as capacitors, linearized by different compensation techniques. This work shows the design, simulation and measured results of a number of MOSFET-only /spl Sigma//spl Delta/ modulators using different implementations of so called compensated depletion-mode MOS capacitors. The modulators are designed for the demands of speech band applications. The performance of the modulators proves the capability of compensated depletion-mode MOS capacitors to fulfill analog circuit requirements at low supply voltages with reduced processing efforts. |
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