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A Capacitive Feedback Transimpedance Amplifier with a DC Feedback Loop Using a Transistor for High DC Dynamic Range.

Jung-Hoon Noh1

  • 1Agency for Defense Development, P.O. Box 35, Yuseong, Daejeon 34134, Korea.

Sensors (Basel, Switzerland)
|August 23, 2020
PubMed
Summary

This study introduces a novel capacitive feedback transimpedance amplifier (CF-TIA) that replaces the traditional resistor with a transistor in the DC feedback loop. This innovation significantly enhances the DC dynamic range and reduces noise for improved signal detection.

Keywords:
capatitive feedbackhigh dynamic DCsystem stabilitytransimpedancetransistor

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Area of Science:

  • Electrical Engineering
  • Analog Integrated Circuit Design

Background:

  • Conventional capacitive feedback transimpedance amplifiers (CF-TIAs) face limitations in DC dynamic range due to resistor constraints in the feedback loop.
  • Low feedback resistor values, necessary for high DC input, increase thermal noise, degrading overall performance.
  • Existing CF-TIAs struggle to accurately sense signals amidst widely varying background DC inputs.

Purpose of the Study:

  • To propose a novel CF-TIA design that overcomes the limitations of conventional approaches.
  • To enhance the DC dynamic range and improve noise performance in transimpedance amplifiers.
  • To ensure system stability across varying DC input levels.

Main Methods:

  • A transistor is utilized in the direct current (DC) feedback loop instead of a resistor.
  • Parasitic capacitance effects of the transistor on system stability are analyzed and compensated.
  • Frequency response and key design parameters, including cut-off frequency and attenuation ratio, are analyzed.
  • A method for ensuring system stability irrespective of the DC input level is developed.

Main Results:

  • The proposed transistor-based CF-TIA achieves a high DC dynamic range.
  • The design effectively mitigates the thermal noise issue associated with low-value resistors.
  • System stability is maintained across different DC input levels.
  • The analysis and stabilization method are generalized for all CF-TIA applications.

Conclusions:

  • The transistor-based CF-TIA offers a significant improvement over conventional designs for applications requiring high DC dynamic range.
  • The proposed circuit and stabilization technique provide a robust solution for accurate signal sensing in challenging DC environments.
  • This work contributes a generalized approach applicable to a wide range of CF-TIA applications.