7 June 2004 A novel CMOS digital pixel sensor for 1D barcode scanning
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Abstract
A 1-D CMOS digital pixel image sensor system architecture is presented. Each pixel contains a photodiode, a low-power charge-sensitive amplifier, low noise sample/hold circuit, an 8-bit single-slope ADC, a 12-bit shift register and timing & control logic. The pixel is laid out on a 4µm pitch to enable a cost efficient implementation of high-resolution pixel arrays. Fixed pattern noise (FPN) is reduced by a charge-sensitive feedback amplifier, and the reset noise is cancelled by correlated double sampling read out. A prototype chip containing 512 pixels has been fabricated in the TSMC .25um logic process. A 40μV/e- conversion gain is measured with 100 e- rms read noise.
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Mei Yan, Gianluigi DeGeronimo, Paul O'Connor, Bradley S. Carlson, "A novel CMOS digital pixel sensor for 1D barcode scanning", Proc. SPIE 5301, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications V, (7 June 2004); doi: 10.1117/12.526736; https://doi.org/10.1117/12.526736
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