| 摘要 |
It is an object of the present invention to provide a solid-state image pickup device capable of preventing any output variation due to a threshold voltage variation, and preventing a dynamic range from being narrowed in conjunction with deterioration in outputs due to a lowered threshold voltage. The present invention provides improvements in type and connection of a reset transistor, a select transistor, and an amplifier transistor to achieve the above object. Specifically, the present invention provides a solid-state image pickup device comprising a first MOS transistor serving as a reset switch, a second MOS transistor serving as a select switch, a photodiode, and a third MOS transistor having a source connected in series with the photodiode. In this solid-state image pickup device, the first and second MOS transistors are connected in series with one another between a voltage source and an output end, and the photodiode and the third MOS transistor are connected in series with one another between a voltage source and a ground. Further, the connection point between the first and second MOS transistors is connected to the gate of the third MOS transistor.
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