Energy-efficient successive-approximation-register based capacitive interface for pressure sensors


A completely unique energy-efficient eight bit two.seventy eight kS/s capacitance-to-digital converter (CDC) interface for capacitive pressure sensors is presented. A new direct-capacitance-comparison technique (DCCT) is proposed and employed together with a successive approximation register (SAR) algorithm to resolve the sensor capacitance by, directly, comparing it with an on-chip binary-weighted capacitive digital-to-analogue converter (DAC) array. An offset DAC array compensates for the sensor rest and parasitic capacitances, accordingly, the interface offers a dynamically zoomed digital-output code that corresponds only to the sensor capacitance modification. The complete-scale input capacitance of the CDC is definitely adjustable to interface to a wide selection of sensors. The proposed eight bit SAR-based mostly CDC is designed and simulated using zero.eighteen μm customary CMOS technology. The CDC exhibits a capacitance sensing range from 4 to six pF, provides a resolution and linearity of seven.26 and eight.a pair of bit, respectively. It achieves a figure-of-merit of one.8 pJ/step at one.four V provide and 36 μs conversion time. Compared with the state-of-the-art implementations with similar performance.

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