研究目的
Investigating the enhancement of input dynamic range of current sensing systems for optical sensors through a pulse-width modulation-based readout circuit with adaptive frequency control technique.
研究成果
The proposed PWM-based readout circuit with adaptive frequency control technique successfully enhances the dynamic range of current sensing systems for optical sensors, making it suitable for various applications with varying photocurrent output and parasitic capacitance.
研究不足
The range of input capacitance (CIN) is limited by photodiode parasitic capacitance (CPD) and gate capacitance of the CTIA (CG). The detection range can vary according to the application, structure, and production defects of the sensor.
1：Experimental Design and Method Selection:
The study designs a PWM-based readout circuit for optical sensors with adaptive frequency control to enhance dynamic range.
2：Sample Selection and Data Sources:
Uses a commercial photodiode with CPD of 28 pF and IPD from 100 pA to 1 uA.
3：List of Experimental Equipment and Materials:
Designed and fabricated using a 65 nm CMOS process.
4：Experimental Procedures and Operational Workflow:
The readout IC consists of CTIA, PWM generator, N-bit counter, ring oscillator, and frequency controller. The frequency controller adaptively adjusts the operating frequency according to the photocurrent range.
5：Data Analysis Methods:
PWM ratio is calculated to analyze the relationship between pulse width and the period of CLKPWM.
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