Non-contact data recording medium

Details Non-contact data recording medium Non-contact data recording medium

1995-09-07

1997-09-23

Hajec, Donald T.

Registers

Records

Magnetic

235492, G06K 1906

Patent

active

056707720

ABSTRACT:
An IC card having two coupling coils, two rectifier circuits, internal circuits, a voltage-adjusting circuit, a reset-signal generating circuit, and a wave-selecting circuit. The coils receives two carrier waves which are shifted in phase by 90.degree.. The rectifier circuits rectify the carrier waves, generating direct-current voltages for the internal circuits. The voltage-adjusting circuit adjusts the direct-current voltages to a voltage of a predetermined value. The reset-signal generating circuit has hysteresis. The wave-selecting circuit selects one of the carrier waves and outputs the selected wave as a system clock signal. The system clock signal is stable, and the internal circuits can perform stable operations. The IC card can stably operate to receive data and transmit data. Furthermore, the IC can be easily made in the form of an LSI.

REFERENCES:
patent: 4272758 (1981-06-01), Giraud
patent: 4692604 (1987-09-01), Billings
patent: 4918416 (1990-04-01), Walton et al.
patent: 4924171 (1990-05-01), Baba et al.
patent: 5013898 (1991-05-01), Glasspool
patent: 5326965 (1994-07-01), Inoue
patent: 5424527 (1995-06-01), Takahira
patent: 5436441 (1995-07-01), Inoue

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