Patent ID: 7424265

Claim:
A rectifier circuit comprising: a bias circuit that outputs a direct-current voltage and includes a first switching unit that is connected to a predetermined voltage source, a first capacitor that holds a voltage supplied through the first switching unit, a second switching unit that is connected to the first capacitor, operation of the second switching unit being complementary with operation of the first switching unit, and a second capacitor that holds a voltage supplied through the second switching unit, as the direct-current voltage; a first MOS transistor that has a gate and a source, only the direct-current voltage being applied between the gate and the source of the first MOS transistor; a second MOS transistor that has a gate, a source, and a drain connected to the source of the first MOS transistor, only the direct-current voltage being applied between the gate and the source of the second MOS transistor; and a coupling capacitor that has a first end which is connected to the source of the first MOS transistor, and a second end to which an alternating-current signal is input.