Semiconductor device and operation method thereof

A method for operating a semiconductor device comprising a first transistor, a first capacitor, a first output terminal, a first switch, a second switch, a second capacitor, a current-voltage converter circuit, and an amplifier circuit,

• wherein a gate and a source of the first transistor are electrically connected to each other,
• wherein a first terminal of the first capacitor and the first output terminal are electrically connected to a back gate of the first transistor,
• wherein a second terminal of the first capacitor is electrically connected to the source,
• wherein the first switch controls input of a first voltage to the back gate,
• wherein a second voltage is input to a drain of the first transistor, and
• wherein the second switch controls input of a third voltage to the source,
• wherein a first terminal of the second capacitor is electrically connected to the first output terminal,
• wherein a second terminal of the second capacitor is electrically connected to an input terminal of the current-voltage converter circuit, and
• wherein the amplifier circuit amplifies a fifth voltage output from the current-voltage converter circuit and outputs a sixth voltage,
• the method comprising:
• turning on the first switch and the second switch in a first period;
• turning off the second switch in a second period after the first period;
• turning off the first switch in a third period after the second period;
• and
• turning on the second switch in a fourth period after the third period.