| 摘要 |
<p>An A/D conversion circuit (20) comprising a coupling capacitor element (C201), a feedback capacitor element (C202), a switch element (SW202), an amplifier (201), a comparison unit (202), a capacity control unit (203), and variable capacity units (210, 220, 230). The variable capacity unit (210) includes capacitor elements (C211-C214) and switch elements (SW211-SW214). The capacitor elements (C211-C214) is connected at one end thereof with the inverted input terminal of the amplifier (201), and at the other end thereof with one of a reference voltage value (Vref1) and a reference voltage value (Vcom) via the switch elements (SW211-SW214).</p> |
