Telecommunication device

• US 6,498,923 B2
• Filed: 08/24/1999
• Issued: 12/24/2002
• Est. Priority Date: 03/28/1997
• Status: Expired due to Term

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Ikefuji, Yoshihiro, Taguchi, Haruo, Chimura, Shigemi
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US09/355,989
• Publication Number:
  US 20020137463A1
• Time in Patent Office: 1,218 Days
• Field of Search: 455/41, 455/62, 455/73, 455/106, 455/101, 455/552, 455/77, 455/87, 455/85, 340/10-- 1, 340/854.8, 340/572.1, 342/42, 342/51
• US Class Current: 455/41.1
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs

Abstract

A data communication apparatus according to the present invention can be used both in one-wave mode and two-wave mode, and includes: first and second tuning circuits (1, 2); a power supply circuit (3) connected to first tuning circuit (1) for generating power by a signal received by first tuning circuit (1); an information processing circuit (15) connected to first tuning circuit (1) or second tuning circuit (2) through a switching circuit (6) and including a detection circuit (7), a decoder (8), an encoder (10) and the like. Information processing circuit (15) includes a switch control circuit (14) detecting if the mode of the received radio wave is one-wave mode or two-wave mode in accordance with an output from first tuning circuit (1) and controlling switching circuit (6) such that detection circuit (7) is connected to one of first and second tuning circuits (1, 2).

Claims

1. A multiple mode capable data communication apparatus for data communication with an interrogator, said interrogator being adapted to operate in a one-wave mode operation in which a first signal of a first frequency modulated with interrogation data is transmitted, or in a two-wave mode operation in which the first signal of the first frequency is not modulated and a second signal of a second frequency modulated with the interrogation data is transmitted, said data communication apparatus comprising:

power generating means for generating power from the first signal transmitted from said interrogator;

demodulating means for demodulating the interrogation data of the first signal when the interrogator is in the one wave mode operation, and demodulating the interrogation data of the second signal when the interrogator is in the two wave mode operation;

switching means for switching the demodulating means between a one wave mode operation and a two wave mode operation; and

modulating means for modulating response information for the interrogation data obtained by the demodulated first signal, to a signal of the first frequency when said interrogator is in the one-wave mode operation, and for modulating the response information for the interrogation data obtained by the demodulated second signal, to a signal of the second frequency when said interrogator is in the two-wave mode operation.

2. The data communication apparatus according to claim 1, wherein said modulating means includes:

first tuning means for transmitting and receiving said signal having the first frequency;

second tuning means for transmitting and receiving said signal having the second frequency, wherein the demodulating means demodulates a signal received by one of said first tuning means and said second tuning means and, wherein the switching means connects said demodulating means and one of said first tuning means and said second tuning means and connects said demodulating means and said first tuning means in an initial state; and

switch controlling means connected to said demodulating means for controlling said switching means to connect said demodulating means and said first tuning means when said signal having the first frequency demodulated by said demodulating means has been modulated and to connect said demodulating means and said second tuning means when said signal has not been modulated.

3. The data communication apparatus according to claim 2, wherein said modulating means (15) further includes differential amplifying means (17) connected between said switching means (6a, 6b) and said demodulating means (7) for differentially inputting the signal received by said first tuning means (1) or said second tuning means (2).