Semiconductor device
First Claim
1. A semiconductor device comprising:
- an antennaan input circuit configured to generate a DC voltage from an Ac signal supplied from the antenna;
a filter;
a circuit for generating a constant voltage configured to generate the constant voltage from the DC voltage supplied through the filter;
a circuit portion comprising a memory; and
a feedback circuit configured to change impedance of the semiconductor device in accordance with the constant voltage,wherein the constant voltage is supplied to the circuit portion and the feedback circuit from the circuit for generating the constant voltage,wherein the input circuit is directly connected to the antenna, andwherein the feedback circuit is directly connected to the antenna.
1 Assignment
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Accused Products
Abstract
The adverse effect of noise a constant voltage receives in a semiconductor device capable of data communication through wireless communication is suppressed. Further, communication is performed normally with a constant voltage with less noise even in the case where the amount of received power is large. The semiconductor device includes an input circuit for generating a DC voltage from an AC signal, a circuit for generating a constant voltage lower than the DC voltage, a circuit portion supplied with the constant voltage, a filter, and a feedback circuit for changing impedance with the constant voltage input from the circuit for generating a constant voltage, wherein the filter is electrically connected between the input circuit and the circuit for generating a constant voltage.
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Citations
12 Claims
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1. A semiconductor device comprising:
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an antenna an input circuit configured to generate a DC voltage from an Ac signal supplied from the antenna; a filter; a circuit for generating a constant voltage configured to generate the constant voltage from the DC voltage supplied through the filter; a circuit portion comprising a memory; and a feedback circuit configured to change impedance of the semiconductor device in accordance with the constant voltage, wherein the constant voltage is supplied to the circuit portion and the feedback circuit from the circuit for generating the constant voltage, wherein the input circuit is directly connected to the antenna, and wherein the feedback circuit is directly connected to the antenna. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor device comprising:
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an antenna; an input circuit configured to generate a DC voltage from an AC signal supplied from the antenna; a filter; a circuit for generating a constant voltage configured to generate the constant voltage from the DC voltage supplied through the filter; a circuit portion; and a feedback circuit configured to change impedance of the semiconductor device in accordance with the constant voltage, wherein the constant voltage is supplied to the circuit portion and the feedback circuit from the circuit for generating the constant voltage, wherein the input circuit is directly connected to the antenna, and wherein the feedback circuit is directly connected to the antenna. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification