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An Image Signal Accumulation Multi-Collection-Gate Image Sensor Operating at 25 Mfps with 32 × 32 Pixels and 1220

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Summary

This study introduces an ultra-high-speed image sensor with multiple collection gates (MCG) and in-pixel memory for capturing faint, fast events. The sensor achieves high sensitivity and frame rates by combining backside illumination and signal accumulation.

Keywords:
ISASMCGhigh-speedimage sensorimage signal accumulation

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Area of Science:

  • Image Sensor Technology
  • High-Speed Imaging
  • Low-Light Photography

Background:

  • Reproducible events emitting very weak light require advanced imaging solutions.
  • Existing sensors struggle with capturing faint, high-speed phenomena.

Purpose of the Study:

  • To develop an ultra-high-speed image sensor with enhanced sensitivity for low-light, fast events.
  • To enable high frame counts and frame rates simultaneously.

Main Methods:

  • Utilized backside-illumination for increased light capture.
  • Implemented multiple collection gates (MCG) per pixel.
  • Integrated in-pixel memory units for signal accumulation and delayed readout.

Main Results:

  • Achieved a test sensor with 32x32 pixels, each with 4 MCGs and 1220 total frames.
  • Demonstrated a camera operating at 25 Megapixels per second (Mfps).
  • Sensor designed for potential operation at 50 Mfps.

Conclusions:

  • The developed sensor architecture significantly boosts sensitivity and frame rate for weak light imaging.
  • In-pixel memory and MCGs are key to achieving high frame counts and speeds.
  • This technology is promising for capturing transient, low-intensity events.