Rectifier circuit, semiconductor device using the rectifier circuit, and driving method thereof
First Claim
1. A rectifier circuit comprising:
- a variable capacitor and a plurality of diodes for rectifying an inputted AC voltage, wherein a capacitance value of the variable capacitor is changed in accordance with the amplitude of the AC voltage.
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Abstract
An object of the present invention is to provide a rectifier circuit which can suppress loss of power due to parasitic capacitance or parasitic inductance of a semiconductor element. The rectifier circuit matches or mismatches impedance between a circuit of a previous stage and the rectifier circuit in accordance with the amplitude of an input AC voltage. When an AC voltage to be input has a smaller amplitude than a predetermined voltage, impedance is matched and the AC voltage is applied as is to the rectifier circuit. Conversely, when an AC voltage to be input has a larger amplitude than a predetermined voltage, impedance is mismatched, and the amplitude of the AC voltage is decreased by reflection and then the AC voltage is applied to the rectifier circuit.
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Citations
46 Claims
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1. A rectifier circuit comprising:
a variable capacitor and a plurality of diodes for rectifying an inputted AC voltage, wherein a capacitance value of the variable capacitor is changed in accordance with the amplitude of the AC voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A semiconductor device comprising:
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a rectifier circuit for rectifying an AC voltage fed from an antenna, wherein the rectifier circuit includes a variable capacitor; and a capacitance value of the variable capacitor is changed in accordance with an amplitude of the AC voltage.
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24. A semiconductor device comprising:
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an antenna and a rectifier circuit for rectifying an AC voltage fed from the antenna, wherein the rectifier circuit includes comprises a variable capacitor; and a capacitance value of the variable capacitor is changed in accordance with an amplitude of the AC voltage. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method for driving a semiconductor device comprising:
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feeding an AC voltage from an antenna; rectifying the AC voltage by a rectifier circuit including a variable capacitor; and changing a capacitance value of the variable capacitor in accordance with an amplitude of the AC voltage.
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Specification