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A photodiode plays a major role in most optical sensors. The output of a photodiode is current, so a signal conditioning circuit is used to convert the current signal to a voltage signal as well as amplify it. This paper presents a comparison in performance between two signal conditioning circuits for a photodiode. The first one is implemented using discrete elements, and the other one is implemented using a Programmable System-on-Chip (PSoC). The circuit mainly consists of a transimpedance amplifier (TIA) and a single level of amplification. Furthermore, a simulation of the circuit was performed using MATLAB. The results demonstrate that PSoC attained better accuracy and precision in performance for DC and low-frequency signals.

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Comparative Analysis of Photodiode Signal Conditioning Circuits

  • 会议论文

  • 发表日期：

    2025年

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  • G. Sasikala,
  • Shaher Dwik

摘要

A photodiode plays a major role in most optical sensors. The output of a photodiode is current, so a signal conditioning circuit is used to convert the current signal to a voltage signal as well as amplify it. This paper presents a comparison in performance between two signal conditioning circuits for a photodiode. The first one is implemented using discrete elements, and the other one is implemented using a Programmable System-on-Chip (PSoC). The circuit mainly consists of a transimpedance amplifier (TIA) and a single level of amplification. Furthermore, a simulation of the circuit was performed using MATLAB. The results demonstrate that PSoC attained better accuracy and precision in performance for DC and low-frequency signals.