| 摘要 |
An A/D conversion circuit 20 comprises a coupling capacitor C201, feedback capacitor C202, switch SW202, amplifier 201, comparison portion 202, capacitance control portion 203, and variable capacitance portions 210, 220, and 230. The variable capacitance portion 210 comprises capacitors C211 to C214 and switches SW211 to SW214. One end of each of the capacitors C211 to C214 is connected to the inverted input terminal of the amplifier 201, and the other end is connected, via the respective switches SW211 to SW214, to either the reference voltage Vref1 or to the common voltage Vcom. <IMAGE> |
