| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal reading circuit which achieves miniaturization and highly precise signal reading without depending on fluctuation of sampling capacity and to provide a control method of the signal reading circuit.SOLUTION: A signal reading circuit includes: a first capacity for holding a first charge; a second capacity for holding a second charge; an amplification section including an amplifier whose gain is one and which outputs a potential inputted to first and second input terminals to first and second output terminals; and a switching circuit for switching connection between the first capacity and the second capacity and the amplifier. A difference between the first charge and the second charge is an amount which shows a voltage value of a prescribed voltage signal. The switching circuit switches connection of the individual terminals so that the first capacity is allowed to hold the first charge and the second capacity to hold the second charge in the case of a first operation and the first capacity is connected between the first input terminal and the first output terminal and the second capacity is connected between the second input terminal and the second output terminal in the case of a second operation. |
