| 摘要 |
PROBLEM TO BE SOLVED: To lessen the deviation of a node potential at a reference voltage side due to a reset operation. SOLUTION: A reset signal RST is set to 'H' and then to 'L' to actuate a photodiode D1 to start an integration step according to the intensity of the light. Its detection signal is transferred to a CDS circuit 20. In the circuit 20, an SW 1 and a sampling connection switch 21 are set on to store detection signals as charges in C1 and C2 according to an integration time. After a specified time lapsed, the SW1 and the sampling connection switch 21 are turned off to hold the sampled detection signals. The RST is again set to 'H', the SW1 is set on, then the RST is set to 'L', and the SW1 is turned off to sample and hold the reset noise in the C1, thereby extracting only the signal components of the detection signal. Then an outputting connection switch SW3 and a reading connection switch 22 are turned on to transfer an output voltage signal corresponding to the signal component of the detection signal to an output bus line. COPYRIGHT: (C)2003,JPO
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