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A low-power and high-accuracy switched-capacitor (SC) capacitance-to-time (C/T) converter used as an interface for differential capacitive sensors is presented. The propagation delays of the comparator do not directly have effect on the accuracy, but the difference between rising propagation delays of the comparator for two reference voltages does. Lower power consumption can be attained without causing...
A high-accuracy switched-capacitor (SC) differential-capacitance-to-time converter (DCTC) for capacitive sensors is presented for high-accuracy ratiometric operation. This circuit does not require component matching. Performances of the proposed circuit are simulated by HSPICE using 0.18 µm CMOS process parameters. Simulated results have demonstrated that 0.2 % resolution is achievable. The op-amp...
A high-accuracy CMOS interface for differential capacitive sensors using a time-to-digital converter (TDC) is presented for high-accuracy ratiometric operation. A capacitance-to-time converter (CTC) is developed based on a switched-capacitor (SC) sample/hold (S/H) circuit and an integrator. The proposed TDC achieves high resolution without using higher frequency clock signals. The Performances of...
A high-accuracy and low-power consumption switched-capacitor (SC) differential-capacitance-to-time converter (DCTC) is presented for high-accuracy ratiometric operation of capacitive sensors. This circuit does not require additional capacitors and component matching. Performances of the proposed circuit are simulated by HSPICE using a 0.35 µm n-well CMOS process parameter. Simulated results have demonstrated...
The aim of this study was to evaluate the craniofacial morphology and pharyngeal airway space in children with both unilateral cleft lip and palate (UCLP) and habitual snoring. Eighteen patients with UCLP visited the Orthodontic Clinic, Meikai University hospital between April 2002 and January 2005. The patients with UCLP were divided into two groups. One group included eight children who were associated...
A high-accuracy and low-power consumption interface of differential capacitance transducer based on switched-capacitor (SC) sample/hold (S/H) circuit including a fully-differential subtractor is presented. This interface reduces the nonlinear error by means of double sampling and does not require component matching. Performances of the proposed interface are simulated by HSPICE using a 0.35 μm n-well...
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