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This paper deals with the design of CMOS sampling switch for ultra-low power analog-to-digital converters (ADC) in biomedical applications. General switch design constraints are analyzed, among which the voltage droop due to the subthreshold leakage current constitutes the major error source for low-speed sampling circuits. Based on the analyses, a CMOS sampling switch with leakage-reduction has been...
A new double-sampling architecture is proposed for wideband low-power ΔΣ ADC design. A direct-charge-transfer adder is used to reduce the bandwidth requirements for the adder, and the loop filter's linearity requirement is relaxed by using a low-distortion topology. To verify the proposed design methodology, a 2nd order double-sampling delta-sigma ADC using the proposed scheme has been designed and...
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