Semiconductor device
First Claim
1. A semiconductor device comprising an antenna and a chip, the chip comprising:
- a comparison circuit configured to compare an input voltage supplied through the antenna with a reference voltage and output a voltage in accordance with the input voltage;
a bias circuit portion configured to receive a modulation signal and a voltage outputted from the comparison circuit and output one or both of the modulation signal and a protection signal; and
a protection/modulation circuit portion having a switch which operates in accordance with one or both of the modulation signal and the protection signal outputted from the bias circuit portion.
1 Assignment
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Accused Products
Abstract
It is an object to provide a highly reliable semiconductor device which operates normally even when a communication distance is extremely short. A semiconductor device which transmits/receives data by wireless communication includes a comparison circuit which compares electric power supplied form outside with electric power serving as a reference; a bias circuit portion which outputs a protection signal and a modulation signal in accordance with output of the comparison circuit; and a protection/modulation circuit which performs protection to prevent degradation and breakdown of elements of the semiconductor device and modulation to transmit data, with one circuit.
57 Citations
19 Claims
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1. A semiconductor device comprising an antenna and a chip, the chip comprising:
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a comparison circuit configured to compare an input voltage supplied through the antenna with a reference voltage and output a voltage in accordance with the input voltage; a bias circuit portion configured to receive a modulation signal and a voltage outputted from the comparison circuit and output one or both of the modulation signal and a protection signal; and a protection/modulation circuit portion having a switch which operates in accordance with one or both of the modulation signal and the protection signal outputted from the bias circuit portion. - View Dependent Claims (2, 3, 4)
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5. A semiconductor device comprising a first antenna, a second antenna, a chip, and a battery, the chip comprising:
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a comparison circuit configured to compare an input voltage supplied through the first antenna with a reference voltage and output a voltage in accordance with the input voltage; a bias circuit portion configured to receive a modulation signal and a voltage outputted from the comparison circuit and output one or both of the modulation signal and a protection signal; and a protection/modulation circuit portion having a switch which operates in accordance with one or both of the modulation signal and the protection signal outputted from the bias circuit portion. wherein the battery stores electric power supplied through the second antenna. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A semiconductor device comprising an antenna and a chip, the chip comprising:
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a comparison circuit configured to compare an input voltage supplied through the antenna with a reference voltage and output a voltage in accordance with the input voltage; a bias circuit portion configured to receive a modulation signal and a voltage outputted from the comparison circuit and output one or both of the modulation signal and a protection signal; and a protection/modulation circuit portion having a switch which operates in accordance with one or both of the modulation signal and the protection signal outputted from the bias circuit portion, wherein the antenna and the chip are formed over a substrate. - View Dependent Claims (12, 13, 14)
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15. A semiconductor device comprising:
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a protection/modulation circuit portion adapted to be electrically connected to an antenna; a circuit configured to output a bias signal in accordance with a magnitude of a voltage supplied through the antenna; a logic circuit configured to output a modulation signal; and a bias circuit portion configured to receive the modulation signal from the logic circuit and add a bias voltage to the modulation signal in accordance with the bias signal, wherein the protection/modulation circuit portion is electrically connected to the bias circuit portion and has an impedance which is variable in accordance with an output of the bias circuit portion. - View Dependent Claims (16, 17, 18, 19)
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Specification