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The Linearity and Sensitivity Improved Sensor Read-Out Circuit
Hyun-Ki Hong(홍현기),Sung-Hun Jo(조성훈) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
As a disadvantage of the wheatstone bridge, it is known that output voltage has nonlinear characteristics into applied resistive sensor. To solve this problem, the modified circuit is proposed. In particular, the larger the sensor resistance, the smaller the change in the output voltage, so the main purpose of this research was to supplement this lower output voltage change. A resistor array was introduced that showed linearity by changing the internal resistance according to the change in the sensor resistance. To automate the process of changing the internal resistance, an operational amplifier and a micro controller unit (MCU) were adopted.
A Capacitance-to-Time Conversion-Based Read-Out Circuit for Sensor Applications
Taegeon Yoon(윤태건),Sung-Hun Jo(조성훈) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
A capacitance-to-time conversion-based read-out circuit for sensor applications is proposed. As the CMOS process scaled down to the deep subnanometer process, the supply voltage decreases, which limits the implementation of high-resolution characteristics in the voltage domain readout circuit. In this paper, a counter-based capacitance sensor readout circuit is proposed. The time it takes to charge or discharge varies depending on the magnitude of the capacitance sensor, and the magnitude of sensor change can be detected by measuring it in the time domain. By using the proposed method, the capacitance of the sensor can be accurately determined without complex calibration or external components, and it can be applied to various sensor applications.