发明名称 |
Self compensating correlated double sampling circuit |
摘要 |
A self-compensating correlated double sampling circuit for a pixel image signal and a method to process the same. 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.
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申请公布号 |
US6753912(B1) |
申请公布日期 |
2004.06.22 |
申请号 |
US19990387548 |
申请日期 |
1999.08.31 |
申请人 |
TAIWAN ADVANCED SENSORS CORPORATION |
发明人 |
WAYNE DAVID A. |
分类号 |
G06T1/00;H04N1/028;H04N5/217;H04N5/335;(IPC1-7):H04N5/217;H04N3/14;H04N5/228 |
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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