ANALOG-DIGITAL CONVERTER AND SOLID-STATE IMAGE CAPTURE DEVICE |
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| 申请号 | EP12866477 | 申请日 | 2012-12-14 | 公开(公告)号 | EP2809008A4 | 公开(公告)日 | 2015-10-14 |
| 申请人 | UNIV TOHOKU; OLYMPUS CORP; | 发明人 | SUGAWA SHIGETOSHI; | ||||
| 摘要 | To obtain accurate digital data while using a successive approximation system when performing analog-to-digital conversion processing in a plurality of steps. There is provided an AD converter including a ramp waveform signal generation unit (14) that generates a ramp voltage based on a count signal from a counter (15), a signal conversion unit (13), and a control unit (18), in which the signal conversion unit (13) includes a sample-and-hold circuit that holds an input signal voltage, a successive approximation capacitance group (16) that outputs a plurality of bias voltages according to a connection combination of a predetermined number of capacitances having different capacitance values, and a comparison unit (17) that compares one of the ramp voltage and the bias voltage with the signal voltage, and the control unit (18) generates a digital signal of the signal voltage based on a comparison result by the comparison unit (17) of the bias voltage and the signal voltage and a comparison result by the comparison unit (17) of the ramp voltage and the signal voltage while acquiring data for calibration of the successive approximation capacitance group (16) based on the connection combination of the capacitances and the ramp voltage. | ||||||
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