Back to results
US 5,862,174 AGranted
Data storage medium
AssigneeKabushiki Kaisha Toshiba
InventorsTsuneshi Yokota, Tetsuo Saitoh
Life of this patent
Estimating the term…
Abstract
A first full-wave rectifier circuit generates a power supply voltage from a received modulated radio wave signal and a second full-wave rectifier circuit binarizes the voltage to obtain a binary signal. A continuous clock signal is generated from the binary signal. The modulated radio wave signal is also binarized and demodulated using the continuous clock signal. This demodulation is performed simultaneously with the generation of the power supply voltage. A command can be received continuously and data can be read or written continuously. Therefore, the reception of power or the reception/transmission of data need not be performed intermittently, but rather a large amount of data can be received or transmitted continuously at high speed.
Claims13
A data storage medium without a battery, comprising:
- reception means for receiving a two-phase modulated radio wave signal;
- first and second full-wave rectifying means for full-wave-rectifying the two-phase modulated radio wave signal received by said reception means;
- power supply voltage generation means for generating a power supply voltage from an output voltage of said first full-wave rectifying means;
- first binarization means for binarizing an output voltage of said second full-wave rectifying means;
- clock signal generation means for generating a continuous clock signal in response to a binary signal output from said first binarization means;
- second binarization means for binarizing the two-phase modulated radio wave signal received by said reception means;
- and
- demodulation means for demodulating a binary signal output from said second binarization means, using the continuous clock signal generated by said clock signal generation means.
5 more elements
A data storage medium with a memory for storing data without a battery, comprising:
- reception means for receiving a first two-phase modulated radio wave signal having a predetermined frequency;
- power supply voltage generation means for generating a power supply voltage from the first two-phase modulated radio wave signal received by said reception means;
- clock signal generation means for generating a continuous clock signal from the first two-phase modulated radio wave signal received by said reception means;
- modulation means for modulating data read out of the memory using a second clock signal generated by frequency-dividing the continuous clock signal generated by said clock signal generation means;
- and
- transmission means for transmitting a second two-phase modulated radio wave signal which corresponds to the data modulated by said modulation means and is superimposed upon the first two-phase modulated radio wave signal received by said reception means, said second two-phase modulated radio wave signal having a frequency which is 1/n (n=an integer) as high as the predetermined frequency of the first two-phase modulated radio wave signal received by said reception means.
3 more elements
A data storage medium comprising:
- reception means for receiving a modulated radio wave signal having a predetermined frequency;
- power supply voltage generation means for generating a power supply voltage from the modulated radio wave signal received by said reception means;
- clock signal generation means for generating a continuous first clock signal from the modulated radio wave signal received by said reception means;
- demodulation means operated by the power supply voltage generated by said power supply voltage generation means, for demodulating the modulated radio wave signal received by said reception means using the continuous first clock signal generated by said clock signal generation means;
- a nonvolatile memory for nonvolatilely storing data demodulated by said demodulation means;
- modulation means for modulating data read out from said nonvolatile memory, using a second clock signal generated by frequency-dividing the continuous first clock signal generated by said clock signal generation means;
- and
- transmission means connected to said reception means for transmitting a variation in current as a return radio wave in accordance with the data modulated by said modulation means, said variation being caused by causing a current source to absorb carrier electromotive force induced in said reception means at a frequency which is 1/n (n=an integer) as high as the predetermined frequency of said modulated radio wave signal.
5 more elements
A data storage medium comprising:
- a parallel tuning circuit having a loop-shaped antenna coil and a capacitor and receiving a two-phase modulated radio wave signal having a predetermined frequency;
- power supply voltage generation means for generating a power supply voltage from the two-phase modulated radio wave signal received by said parallel tuning circuit;
- clock signal generation means for generating a continuous first clock signal from the two-phase modulated radio wave signal received by said parallel tuning circuit;
- demodulation means operated by the power supply voltage generated by said power supply voltage generation means, for demodulating the two-phase modulated radio wave signal received by said parallel tuning circuit using the continuous first clock signal generated by said clock signal generation means;
- a nonvolatile memory for nonvolatilely storing data demodulated by said demodulation means;
- modulation means for modulating data read out from said nonvolatile memory, using a second clock signal generated by frequency-dividing the first continuous clock signal generated by said clock signal generation means;
- and
- transmission means for transmitting a variation in current as a return radio wave, said transmission means having two logic gates which have outputs connected to both ends of said parallel tuning circuit and performing a push-pull operation in accordance with the data modulated by said modulation means so as to absorb a carrier electromotive force, said variation being caused when the carrier electromotive force induced in said parallel tuning circuit is absorbed by said two logic gates at a frequency which is 1/n (n=an integer) as high as the predetermined frequency of the two-phase modulated radio wave signal received by said parallel tuning circuit.
5 more elements
Dependencies are inferred from the claim text.