Fig. 1.
Diagram of the pixel-level ADC using the voltage reset technique and associating waveforms
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| Citation: |
Minzeng Li, Fule Li, Chun Zhang, Zhihua Wang. Pixel-level A/D conversion using voltage reset technique[J]. Journal of Semiconductors, 2014, 35(11): 115009. doi: 10.1088/1674-4926/35/11/115009
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M Z Li, F L Li, C Zhang, Z H Wang. Pixel-level A/D conversion using voltage reset technique[J]. J. Semicond., 2014, 35(11): 115009. doi: 10.1088/1674-4926/35/11/115009.
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Pixel-level A/D conversion using voltage reset technique
DOI: 10.1088/1674-4926/35/11/115009
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Abstract
This paper presents a 50 Hz 15-bit analog-to-digital converter (ADC) for pixel-level implementation in CMOS image sensors. The ADC is based on charge packets counting and adopts a voltage reset technique to inject charge packets. The core circuit for charge/pulse conversion is specially optimized for low power, low noise and small area. An experimental chip with ten pixel-level ADCs has been fabricated and tested for verification. The measurement result shows a standard deviation of 1.8 LSB for full-scale output. The ADC has an area of 45×45 μm2 and consumes less than 2 μW in a standard 1P-6M 0.18 μm CMOS process. -
References
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