Title:
遠隔操作による情報交換のための携帯電子機器
Document Type and Number:
Japanese Patent JP3838667
Kind Code:
B2
Abstract:
PCT No. PCT/FR97/00584 Sec. 371 Date Feb. 26, 1999 Sec. 102(e) Date Feb. 26, 1999 PCT Filed Apr. 2, 1997 PCT Pub. No. WO97/38391 PCT Pub. Date Oct. 16, 1997A memory card, capable of remotely exchanging information with a terminal by modulating a magnetic field generated by said terminal, includes a voltage limiter (LMT) with an input terminal (BE) for receiving, during the transmission of information between the terminal and the card, an amplitude modulated voltage (VNR) with a time-varying average voltage level (NM). A primary transistor (TZ1) is connected between the input terminal and ground. Diodes (D1. . . DN) are series connected between the input terminal (BE) and ground and between the input terminal (BE) and the gate of the primary transistor (TZ1), wherein the threshold voltages of the diodes and primary transistor define a limit value for the input voltage. A capacitor (C) is connected between the primary transistor gate and ground. A resistive array (RD, TR) is connected between the capacitor and ground, and forms, with the capacitor, a resistive/capacitive array with a time constant selected so as to be comprised between the time variation period of the average voltage level and the amplitude modulation period.
Inventors:
Jackie, Bouvie
Application Number:
JP53589597A
Publication Date:
October 25, 2006
Filing Date:
April 02, 1997
Export Citation:
Assignee:
FRANCE TELECOM
International Classes:
G06K19/07; G06K17/00; H03G11/00; H04B5/00
Domestic Patent References:
| JP729649U | ||||
| JP785233A |
Attorney, Agent or Firm:
Nozomi Watanabe
Haruko Sanwa
Haruko Sanwa