Patent ID: 7551171

Claim:
A voltage supply circuit comprising: a first holding element with a first end and a second end that supplies a voltage held between the first end and the second end to a load, the second end being connected to a ground; a second holding element with a first end and a second end, the first end of the second holding element being electrically connected to the first end of the first holding element; a charging circuit that, during a first mode, charges the second holding element with a voltage higher than the voltage to be supplied to the load; and a potential adjusting circuit that, during a second mode that is separate from the first mode, shifts a potential at the second end of the second holding element towards a potential at the first end of the first holding element according to the voltage held by the first holding element or the second holding element, wherein the potential adjusting circuit includes: an operational amplifier that receives a voltage corresponding to the voltage held by the first holding element and a reference voltage according to the target voltage and that outputs a voltage in proportion to the difference between the received voltage and the reference voltage; and a variable resistor electrically connected between a predetermined potential line and the second end of the first holding element, the variable resistor having a variable resistance depending on an output voltage from the operational amplifier.