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A low current consumption delta-sigma modulator for body-implanted chip

This paper presents a very low current consumption CMOS delta-sigma (DeltaSigma) modulator with the aim of use for medical application, which takes advantage of low gate-source voltage by operating in the sub-threshold region. It is based on the switched-opamp (SOP) technique, which allows low voltage operation with a standard CMOS process. Single-ended SOP topology is adopted for the design to reduce the chip area. The DeltaSigma modulator has been designed using 0.35mum standard CMOS technology. Even though using the single-ended SOP, 72dB dynamic range and 2.2muA current consumption have been achieved for the DeltaSigma modulator