Patent ID: 7675349

Claim:
A power supply circuit comprising: a first charge transfer transistor and a second charge transfer transistor connected in series and formed on a substrate; a first wiring providing a drain of the first charge transfer transistor with an input electric potential; an output capacitor connected with a source of the second charge transfer transistor; and a flying capacitor having a first terminal and a second terminal, the first terminal being connected with a connecting node between the first charge transfer transistor and the second charge transfer transistor through a second wiring and the second terminal receiving a clock, wherein a resistance of the first wiring is greater than or equal to 1.5 times a resistance of the second wiring, and the first wiring comprises a first substrate wiring portion disposed on the substrate and a first mounting wiring portion disposed outside the substrate, the second wiring comprises a second substrate wiring portion disposed on the substrate and a second mounting wiring portion disposed outside the substrate, and the resistance of the first wiring is adjusted by changing a width of the first substrate wiring portion, and the resistance of the second wiring is adjusted by changing a width of the second substrate wiring portion.