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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 4545 m2 and consumes less than 2μW in a standard 1P-6M 0.18 m CMOS process.
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 packet counting and adoption 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 4545 m2 and consumes less than 2μW in a standard 1P-6M 0.18 m CMOS process.