No-battery information storage medium capable of efficiently tra

Details No-battery information storage medium capable of efficiently tra No-battery information storage medium capable of efficiently tra

1997-09-16

2000-01-04

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at same station

375219, 34082554, 363 67, H04B 138

Patent

active

060119586

ABSTRACT:
A no-battery information storage medium has a radio communication function of receiving power while receiving an externally transmitted radio wave as modulated data, and transmitting data outside the medium. One transmission/reception antenna coil performs transmission/reception. A first full-wave rectifying circuit is constituted by four rectifying elements connected to each other by bridging connection and connected to the two terminals of the transmission/reception antenna coil. A second full-wave rectifying circuit is constituted by four rectifying elements, including two shared rectifying elements of the four rectifying elements constituting the first full-wave rectifying circuit, connected to each other by bridging connection and connected to the two terminals of the transmission/reception antenna coil. A power generating section is connected to the output of the first full-wave rectifying circuit to generate power to be used inside the information storage medium. A constant-current driver section is connected to the output of the second full-wave rectifying circuit to perform transmission by extracting a predetermined current from an output from the second full-wave rectifying circuit in accordance with transmission data.

REFERENCES:
patent: 4580041 (1986-04-01), Walton
patent: 5847662 (1998-12-01), Yokota et al.
patent: 5862174 (1999-01-01), Yokota et al.

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