Semiconductor Device, Electronic Appliance Using Semiconductor Device, and Document Using Semiconductor Device
First Claim
1. A semiconductor device comprising:
- an antenna configured to convert received carrier waves into an AC signal;
a rectifier circuit configured to rectify the AC signal into a DC voltage;
a demodulation circuit configured to demodulate the AC signal into an encoded signal;
an oscillator circuit configured to generate a first clock signal by supply of the DC voltage;
a synchronizing circuit configured to generate a synchronized encoded signal by synchronizing the encoded signal with use of the first clock signal;
a decoder circuit configured to decode the synchronized encoded signal into a digital signal; and
a register configured to store the digital signal with use of the synchronized encoded signal as a second clock signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A semiconductor device capable of wireless communication which has low power consumption in a step for decoding an encoded signal to obtain data is provided. The semiconductor device includes an antenna configured to convert received carrier waves into an AC signal, a rectifier circuit configured to rectify the AC signal into a DC voltage, a demodulation circuit configured to demodulate the AC signal into an encoded signal, an oscillator circuit configured to generate a clock signal having a certain frequency by supply of the DC voltage, a synchronizing circuit configured to generate a synchronized encoded signal by synchronizing the encoded signal obtained by demodulating the AC signal with the clock signal, a decoder circuit configured to decode the synchronized encoded signal into a decoded signal, and a register configured to store the decoded signal as a clock (referred to as a digital signal).
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Citations
20 Claims
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1. A semiconductor device comprising:
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an antenna configured to convert received carrier waves into an AC signal; a rectifier circuit configured to rectify the AC signal into a DC voltage; a demodulation circuit configured to demodulate the AC signal into an encoded signal; an oscillator circuit configured to generate a first clock signal by supply of the DC voltage; a synchronizing circuit configured to generate a synchronized encoded signal by synchronizing the encoded signal with use of the first clock signal; a decoder circuit configured to decode the synchronized encoded signal into a digital signal; and a register configured to store the digital signal with use of the synchronized encoded signal as a second clock signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device comprising:
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an antenna configured to convert received carrier waves into an AC signal; a rectifier circuit configured to rectify the AC signal into a DC voltage; a demodulation circuit configured to demodulate the AC signal into an encoded signal; a decoder circuit configured to decode the encoded signal into a decoded signal; a first unit configured to generate a first clock signal by supply of the DC voltage; a second unit configured to generate a synchronized encoded signal by synchronizing the encoded signal with use of the first clock signal; and a third unit configured to store data obtained by decoding the synchronized encoded signal in the decoder circuit, with the synchronized encoded signal utilized as a second clock signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A driving method for a semiconductor device including an antenna, a rectifier circuit, a demodulation circuit, an oscillator circuit, a synchronized circuit, a decoder circuit, and a register, comprising the steps of:
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receiving carrier waves; converting the carrier waves into an AC signal by the antenna; rectifying the AC signal into a DC voltage; demodulating the AC signal into an encoded signal; generating a first clock signal in the oscillator circuit supplied with the DC voltage; generating a synchronized encoded signal by synchronizing the encoded signal with use of the first clock signal; supplying the synchronized encoded signal to the decoder circuit and the register; decoding the synchronized encoded signal into a digital signal; and storing the digital signal to the register with use of the synchronized encoded signal as a second clock signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification