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A low power interface circuit for multisensory system is presented in this paper. A SAR capacitance-to-digital converter (CDC) and a SAR analog-to-digital converter (ADC) are combined together so that capacitance or voltage from different sensors can be measured by the same circuit and converted to digital signal directly. A dynamic comparator with self-calibration is designed to achieve zero-static...
A nanopower subthreshold bandgap reference with 30ppm/°C from −30°C to 150°C has been implemented in 0.18µm CMOS. This design is based on weighted ΔVGS and is free of resistors. The major advantage of this design is that with nanopower consumption, the temperature range is extremely wide. To achieve high performance of subthreshold bandgap operating in high temperature (above 80°C), a leakage current...
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