发明名称 |
Image sensor using auto-calibrated ramp signal for improved image quality and driving method thereof |
摘要 |
An image sensor comprises an active pixel sensor (APS) array, a first analog-to-digital converter (ADC) and a ramp signal generator. The APS array includes a plurality of pixels arranged in a two-dimensional matrix, wherein the APS array generates a reset signal and an image signal for each selected column of the APS array. The first ADC includes a correlated double sampling (CDS) circuit array comprising CDS circuits that are arranged for each column of the APS array, wherein the first ADC generates a digital code from a signal corresponding to the difference between the reset signal and the image signal which are generated by the CDS circuit using a ramp signal. The ramp signal generator generates the ramp signal, wherein a second ADC receives a feedback of the generated ramp signal and generates a feedback reference code, and wherein the ramp signal generator calibrates the ramp signal based on a comparison using the feedback reference code.
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申请公布号 |
US7679542(B2) |
申请公布日期 |
2010.03.16 |
申请号 |
US20060508653 |
申请日期 |
2006.08.23 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
HAM SEOG-HEON;HAN GUNHEE;LEE DONG-MYUNG |
分类号 |
H03M1/56;H04N5/335;H04N5/357;H04N5/369;H04N5/374;H04N5/3745;H04N5/378 |
主分类号 |
H03M1/56 |
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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