AD conversion method and the AD conversion equipment as well as physical information acquisition method and physical information acquisition device

摘要

PPROBLEM TO BE SOLVED: To realize high bits of data by preventing influence on conversion errors due to a noise on a reference node or the comparison accuracy of a comparator, in an imaging device equipped with an A/D converter. PSOLUTION: In a column-signal processing unit 22SB-/SB1, the period of a counter clock for counter processing is set to such an extent that conversion errors due to predetermines cause are less likely to occur in a count result by a counter and count processing is performed, thereby acquiring high-order bit data (D1) in digital data, corresponding to a signal to be processed. In a column-signal processing unit 22SB-/SB2, a residual signal component, left after the acquisition of the high-order bit data is amplified at a predetermined amplification rate, and then, the component is converted into digital pixel data D2. In a selection unit 26, the high-order bit data (D1) and the digital data (D2) for the residual signal component are used to obtain corrected pixel data, represented by the higher number of bits than the number of bits of the high-order bit data. PCOPYRIGHT: (C)2006,JPO&NCIPI