发明名称 |
NOISE-MATCHING DYNAMIC BIAS FOR COLUMN RAMP COMPARATORS IN A CMOS IMAGE SENSOR |
摘要 |
Embodiments of an image sensor including a pixel array with a plurality of pixels arranged into rows and columns. Control circuitry coupled to the pixels in each row, and an analog-to-digital converter is coupled to the pixels in each column of the pixel array. Each analog-to-digital converter includes a ramp comparator, and a variable current source coupled to the ramp comparator to provide a variable bias current to the ramp comparator. The bias current can adjusted during reading of a row of pixels according to a dynamic bias current profile that maintains at least a specified margin between the random noise of the pixels and an acceptable noise level. Other embodiments are disclosed and claimed. |
申请公布号 |
US2014048685(A1) |
申请公布日期 |
2014.02.20 |
申请号 |
US201213585492 |
申请日期 |
2012.08.14 |
申请人 |
ZHANG GUANGBIN;SONG ZHIQIANG;OMNIVISION TECHNOLOGIES, INC. |
发明人 |
ZHANG GUANGBIN;SONG ZHIQIANG |
分类号 |
H01L27/146 |
主分类号 |
H01L27/146 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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