EFFICIENT WIDE-RANGE AND HIGH-RESOLUTION BLACK LEVEL AND OFFSET CALIBRATION SYSTEM
First Claim
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1. An analog signal processing system, comprising:
- a readout chain that receives and amplifies dark signal, and generates corresponding digital output; and
a level integrator that performs integration of calibration levels in multiple steps according to the digital output, thereby achieving wide calibration range.
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Abstract
A black level calibration (BLC) system is disclosed. A readout chain receives and amplifies dark signal, and generates corresponding digital output. A level integrator performs integration of calibration levels in multiple steps according to the digital output, thereby achieving wide calibration range.
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Citations
20 Claims
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1. An analog signal processing system, comprising:
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a readout chain that receives and amplifies dark signal, and generates corresponding digital output; and a level integrator that performs integration of calibration levels in multiple steps according to the digital output, thereby achieving wide calibration range. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A black level calibration (BLC) system for an image sensor, comprising:
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a readout chain that receives and amplifies dark signal from a photo detector and generates corresponding digital output; and a level integrator that performs integration of calibration levels in multiple steps according to the digital output, thereby achieving wide calibration range. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A black level calibration (BLC) system for an image sensor, comprising:
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a photo detector; a first amplifier that receives and amplifies dark signal from the photo detector; at least one adder that receives output of the first amplifier at one input end; a second amplifier that receives and amplifies output of the adder; an analog-to-digital converter (ADC) that digitizes output of the second amplifier; a BLC controller that generates control signal according to comparison of the digital output of the ADC and a target; a digital-to-analog converter (DAC) that generates and provides corresponding calibration voltages for multiple steps under control of the BLC controller; a level integrator that performs integration of calibration levels in the multiple steps by receiving the calibration voltages from the DAC, thereby achieving wide calibration range, wherein output of the level integrator is fed to the adder at another input end. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification