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High-Linearity and High-Speed ROIC of Ultra-Large Array Infrared Detectors Based on Adaptive Compensation and

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Summary

This study introduces a novel readout method for infrared (IR) readout integrated circuits (ROICs) that significantly enhances linearity and speed. The technique improves performance by using adaptive offset compensation and AC enhancement, crucial for advanced IR imaging systems.

Keywords:
CDSIR ROIChigh linearityhigh speed

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Area of Science:

  • Electrical Engineering
  • Optoelectronics
  • Integrated Circuit Design

Background:

  • Large array infrared (IR) readout integrated circuits (ROICs) face limitations in linearity and frame rate.
  • Pixel source followers (SF) can introduce nonlinearity in IR ROIC signals.
  • Traditional readout methods struggle to meet the demands of high-performance IR imaging.

Purpose of the Study:

  • To develop a high-linearity and high-speed readout method for large array IR ROICs.
  • To overcome the limitations of existing readout circuits in terms of speed and accuracy.
  • To improve the overall performance of IR imaging systems through advanced ROIC design.

Main Methods:

  • Implemented an efficient correlated double sampling (CDS) method within pixels to optimize noise characteristics.
  • Utilized an alternating current (AC) enhancement method to rapidly establish column bus signals.
  • Employed adaptive offset compensation at the column bus terminal to mitigate nonlinearity from pixel SF.
  • Verified the proposed method on an 8192 × 8192 IR ROIC fabricated using a 55 nm process.

Main Results:

  • Achieved a significant increase in output swing from 2 V to 3.3 V.
  • Enhanced full well capacity from 4.3 Me- to 6 Me-.
  • Reduced row time from 20 µs to 2 µs, improving the frame rate.
  • Improved linearity from 96.9% to an exceptional 99.98%.

Conclusions:

  • The proposed adaptive offset compensation and AC enhancement method effectively addresses linearity and speed limitations in IR ROICs.
  • The developed technique offers substantial improvements in key performance metrics, including output swing, full well capacity, and linearity.
  • This advancement is critical for next-generation high-resolution and high-speed infrared imaging applications.