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QLog Solar-Cell Mode Photodiode Logarithmic CMOS Pixel Using Charge Compression and Readout.
1New Imaging Technologies, Impasse de la Noisette, 91370 Verrières le Buisson CEDEX, France. yang.ni@new-imaging-technologies.com.
Sensors (Basel, Switzerland)
|February 15, 2018
Summary
Researchers developed a novel logarithmic pixel design for advanced imaging. This design achieves a wide dynamic range and low noise using charge domain compression and readout, enabling single-photon detection.
Area of Science:
- * Sensor Technology
- * Image Processing
Background:
- * Traditional image sensors struggle with wide dynamic range and noise.
- * Existing logarithmic pixel designs have limitations in performance and complexity.
Purpose of the Study:
- * To introduce a new logarithmic pixel design with enhanced performance.
- * To validate the concept through prototype implementation and experimental results.
Main Methods:
- * Charge domain logarithmic signal compression.
- * Charge-transfer-based signal readout with correlated double sampling (CDS).
- * Implementation of a 320 × 240 pixel prototype sensor.
Main Results:
- * Achieved linear response in low light and logarithmic response in high light.
- * Demonstrated 120 dB dynamic range with a mobile phone camera-like signal-to-noise ratio (SNR).
- * Validated logarithmic charge compression theory and low readout noise.
Conclusions:
- * The new logarithmic pixel design offers a wide dynamic range and single-photon detection capability.
- * The charge-transfer readout effectively suppresses noise, particularly KTC noise.
- * The design enables compact, high-performance imaging systems without complex sensor designs.
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