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<p>It is always challenging to detect a low intensity UV radiation coming from an atmospheric phenomenon using a simple photodetector based conventional circuits. Gain and noise both are required to be carefully controlled and there is a need for a trade-off between these two parameters for detecting such an input radiation. In such cases, transimpedance amplifier (TIA) can play a crucial role, which is an electronic device that converts input current into an output voltage. It is widely used in applications like photodetector signal processing, optical communication, and remote sensing. However, there is still a need to better the performances of TIAs, especially for ultra-low current levels, in nano and pico-ampere ranges, coming from photodetectors due to weak inputs. These low levels are highly susceptible to noise, if not controlled, will also be amplified along with the signal. The present work demonstrates the design and analysis of a three-stage TIA, optimized for the detection of low intensity signals in UV and low wavelength applications. The proposed design has achieved an optimal gain-bandwidth tradeoff while maintaining a high signal-to-noise ratio (SNR) and optimal stability. The experimental PCB results have shown that for the input current of 100 pA corresponding to off state, an SNR of 46 dB with a bandwidth of 29&#xa0;kHz has been achieved, while for an input current of 161.74 nA, corresponding to on state, the circuit achieves an SNR of 86.84 dB over 1&#xa0;kHz with an extended bandwidth of 256.19&#xa0;kHz and 1 pA/√Hz input-referred noise current at 100&#xa0;kHz. This wide range of detection can make this design highly useful for various applications including low-light detection and biomedical instrumentation.</p>

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Design and development of low noise transimpedance amplifier for low intensity light level detection applications for UV range

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Nikhil Deep Gupta,
  • Ch. V. S. Krishna Shanmukh,
  • N. Akshitha,
  • A. Revant,
  • K. Raghunath,
  • Ashwani Kumar

摘要

It is always challenging to detect a low intensity UV radiation coming from an atmospheric phenomenon using a simple photodetector based conventional circuits. Gain and noise both are required to be carefully controlled and there is a need for a trade-off between these two parameters for detecting such an input radiation. In such cases, transimpedance amplifier (TIA) can play a crucial role, which is an electronic device that converts input current into an output voltage. It is widely used in applications like photodetector signal processing, optical communication, and remote sensing. However, there is still a need to better the performances of TIAs, especially for ultra-low current levels, in nano and pico-ampere ranges, coming from photodetectors due to weak inputs. These low levels are highly susceptible to noise, if not controlled, will also be amplified along with the signal. The present work demonstrates the design and analysis of a three-stage TIA, optimized for the detection of low intensity signals in UV and low wavelength applications. The proposed design has achieved an optimal gain-bandwidth tradeoff while maintaining a high signal-to-noise ratio (SNR) and optimal stability. The experimental PCB results have shown that for the input current of 100 pA corresponding to off state, an SNR of 46 dB with a bandwidth of 29 kHz has been achieved, while for an input current of 161.74 nA, corresponding to on state, the circuit achieves an SNR of 86.84 dB over 1 kHz with an extended bandwidth of 256.19 kHz and 1 pA/√Hz input-referred noise current at 100 kHz. This wide range of detection can make this design highly useful for various applications including low-light detection and biomedical instrumentation.