| 摘要 |
An output signal of an image sensor pixel, which substantially avoids fixed pattern noise contributed by the readout circuitry, is provided. The apparatus, which is used to provide an output signal that is a function of the difference between two sample signals VS1 and VS2, includes first and second capacitor elements that are coupled together at a common terminal. A reference voltage VREF is first applied to the capacitor elements, then a first sample signal VS1 from the image sensor pixel is applied to the first capacitor element producing a charge that is transferred to the second capacitor element. A second sample signal VS2 from the image sensor pixel is then applied to the first capacitor element producing a charge that is also transferred to the first capacitor element such that VO=VS2-VS1+VREF.
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