Non-contact IC card having an active attenuation circuit

Details Non-contact IC card having an active attenuation circuit Non-contact IC card having an active attenuation circuit

1994-02-17

1995-03-07

Willis, Davis L.

Registers

Records

Conductive

235439, G06K 19067, H01H 3600

Patent

active

053960564

ABSTRACT:
The present invention provides a microcomputer in which an input signal is input via a resonance circuit, a CPU for processing data, an input circuit for detecting the input signal, a decoding circuit for demodulating the input signal and supplying a demodulated signal of a predetermined length to the CPU when the input circuit detects the input signal, an attenuation circuit for attenuating oscillation in the resonance circuit when said input circuit detects the input signal, and an output circuit for outputting an output signal from the CPU. A non-contact IC card utilizing the microcomputer includes an antenna circuit for transmitting and receiving data and incorporating the resonance circuit.

REFERENCES:
patent: 3627993 (1971-12-01), Cooper, Jr.
patent: 4644321 (1987-02-01), Kennon
patent: 4818855 (1989-04-01), Mongeon et al.
patent: 4845347 (1989-07-01), McCrindle et al.
patent: 4926996 (1990-05-01), Eglise et al.
patent: 5013898 (1991-05-01), Glasspool
patent: 5226167 (1993-07-01), Yamaguchi
"Non-Contact IC Card Employing Light Communication", 1988, Nikki Electronics, pp. 197-202.

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