| 摘要 |
PROBLEM TO BE SOLVED: To realize the analog/digital conversion of a wide dynamic range on the same chip as a CCD with a high speed operation, high sensitivity and low power consumption. SOLUTION: This analog/digital converting means is provided with charge-coupled devices in N stages, analog arithmetic elements for addition, subtraction and multiplication in every M stage and charge detecting elements in every L stage when N, M and L are natural numbers fulfilling L≤N and M≤N, and characterized by providing a means for deciding whether the output of the charge detecting element exceeds a fixed threshold. Especially, the number of stages of the arithmetic operation until it exceeds a fixed threshold is calculated according to the combination of the multiplication operation of signal charge amounts using collision ionization with a non-destruction detecting amplifier, so that analog/digital conversion having logarithm characteristics is performed with high sensitivity. COPYRIGHT: (C)2005,JPO&NCIPI
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