Patent ID: 6927618

Claim:
An electric circuit for outputting an output voltage to an output terminal based on an input voltage to be inputted from an input terminal, the electric circuit comprising: a transistor; a capacitance device connected between a gate electrode and a source electrode of said transistor, said capacitance device comprising first and second electrodes; a first switch operable to make a potential of one of the first and second electrodes of the capacitance device correspond to a power supply voltage; a second switch operable to make a potential difference between the first and second electrodes of the capacitance device correspond to a threshold voltage of said transistor; and a third switch for outputting said output voltage to said output terminal from said source electrode of said transistor when said input voltage is inputted to the other one of the first and second electrode of the capacitance device, wherein the first switch is connected between the gate electrode and the drain electrode of the transistor and switches a connection and a disconnection between the gate electrode and the drain electrode of the transistor.