发明名称 |
Self compensating correlated double sampling circuit |
摘要 |
<p>A self-compensating correlated double sampling circuit for a pixel image signal and a method to process the same are disclosed. In the circuit, the analog signal generated by the photosensor of the pixel array accessed by a row selection transistor is buffered through a source follower amplifier and coupled to a column in the array. The analog signal from the selected column line is fed through a CDS circuit which is then input to the sample and hold circuit of the ADC. The main purpose of the CDS circuit is to reduce the noise and non-uniformity caused by the non ideal effects associated with the signal path from the photosensor through the CDS circuit. This is accomplished by sampling the signal and a reference level and then performing the subtraction on the two samples and the ADC ramp through the same signal path. <IMAGE></p> |
申请公布号 |
EP1081941(A2) |
申请公布日期 |
2001.03.07 |
申请号 |
EP20000117392 |
申请日期 |
2000.08.24 |
申请人 |
TAIWAN ADVANCED SENSORS CORPORATION |
发明人 |
WAYNE, DAVID |
分类号 |
G06T1/00;H04N1/028;H04N5/217;H04N5/357;H04N5/374;H04N5/378;(IPC1-7):H04N5/217;H03M1/56;H03M1/06 |
主分类号 |
G06T1/00 |
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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