WO1997000493B1 - Semiconductor device, ic card utilizing the same and communication system - Google Patents

Semiconductor device, ic card utilizing the same and communication system

Info

Publication number
WO1997000493B1
WO1997000493B1 PCT/JP1996/001622 JP9601622W WO9700493B1 WO 1997000493 B1 WO1997000493 B1 WO 1997000493B1 JP 9601622 W JP9601622 W JP 9601622W WO 9700493 B1 WO9700493 B1 WO 9700493B1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
circuit
constant
card
electromagnetic wave
Prior art date
Application number
PCT/JP1996/001622
Other languages
French (fr)
Other versions
WO1997000493A3 (en
WO1997000493A2 (en
Filing date
Publication date
Priority claimed from JP7150605A external-priority patent/JPH091968A/en
Priority claimed from JP01046396A external-priority patent/JP3546979B2/en
Application filed filed Critical
Priority to DE69637439T priority Critical patent/DE69637439T2/en
Priority to US08/973,564 priority patent/US6223990B1/en
Priority to CA002224442A priority patent/CA2224442C/en
Priority to EP96917678A priority patent/EP0832467B8/en
Publication of WO1997000493A2 publication Critical patent/WO1997000493A2/en
Publication of WO1997000493A3 publication Critical patent/WO1997000493A3/en
Publication of WO1997000493B1 publication Critical patent/WO1997000493B1/en

Links

Abstract

It is an object to provide an IC card which is facilitated in circuit configuration and program-development as well as a communication system which is improved in characteristics such as the rate of communication and the distance of communication. An IC card (10) comprises an antenna (22a) for receiving an electromagnetic wave for supplying electric power, an antenna (22b) for receiving an electromagnetic wave for data, a rectifying circuit (11) with a capacitor (6) to rectify the received electromagnetic wave to get electric power, a power source circuit (12) for supplying a power source voltage to an internal circuit of the IC card (10) by the use of the electric power obtained, a detecting circuit (13) for detecting a component of data from the received electromagnetic wave, a modulating/demodulating circuit (14) for demodulating the received data and modulating data to be transmitted, an oscillation circuit (1) for generating a clock signal (CP) to be supplied into internal circuits, and a semiconductor device such as a micro-computer and memories, not shown, for processing and storing the data obtained.

Claims

AMENDED CLAIMS
[received by the International Bureau on 6 May 1997 (06.05.97); original claim 1 cancelled; original claims 2-4 amended; remaining claims unchanged (2 pages)]
1 ( Canc e l )
2 (Amended) . An IC card device comprising: a first antenna for obtaining electrical power by receiving an external electromagnetic wave and rectifying; a second antenna for transmitting and receiving data based on the electric power, the second antenna being provided independent of said first antenna; a ring oscillation circuit including a plurality of signal inverters, wherein odd numbers of which are tandem connected in the form of a ring; and a constant-current circuit being set to a current value smaller than electric-current ability for transistors involved in said signal inverter, said constant-current circuit being connected in series to at least one of said transistors connected supplied with a power source voltage or a reference voltage.
3 (Amended) . An IC card according to claim 2 , the current value is generated based on a constant voltage from a constant- voltage circuit. (Amended) . A communication system comprising: an IC card incorporating therewithin a semiconductor integrated circuit, at least one antenna so as to obtain electric power by receiving an external electromagnetic wave and rectifying, the IC card transmitting and receiving data based on the electric power, a ring oscillation circuit including a plurality of signal inverters, wherein odd numbers of which are tandem connected in the form of a ring, and a constant-current circuit being set to a current value smaller than electric-current ability for transistors involved in said signal inverter, said constant-current circuit being connected in series to at least one of said transistors
- 22 - connected supplied with a power source voltage or a reference voltage; and a card gate apparatus having a first antenna for transmitting the electromagnetic wave for the electromagnetic wave for electric power, and a second antenna for transmitting and receiving the data, the second antenna being provided independent of said first antenna.
5. A communication system according to claim 4, wherein said second antenna comprises a transmission antenna for transmitting said data and a reception antenna, which is provided independent of said transmission antenna, for receiving said data.
6. A communica ion system according to claim 4, wherein said second antenna is switched according to the uses for transmission and reception of the data.
7. A communication system according to any one of claims 4 to 6, wherein said card gate apparatus transmits each electromagnetic wave such that the range of distance over which the electromagnetic wave for electric power reaches is longer than that of the electromagnetic wave for transmission of da a .
STATEMENT UNDER ARTICLE 19
The present claim 2 clarifies that an IC card further includes a ring oscillation circuit and a constant-current circuit as originally filed in claim 3.
The citations disclose no features of the ring oscillation circuit and the constant-current circuit.
The present claim 2 provides the effect of facilitating the supply of IC cards capable of positive data transmission and reception.
The present claim 3 defines that the current value is generated based on the a constant voltage from a constant-voltage circuit as described in the specification page 13, lines 6 to 8.
The present claim 4 clari f ies that an IC card of a communication system also has a ring oscillation circuit and a constant-current circuit.
- 24
PCT/JP1996/001622 1995-06-16 1996-06-13 Semiconductor device, ic card utilizing the same and communication system WO1997000493A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69637439T DE69637439T2 (en) 1995-06-16 1996-06-13 RINGOSCILLATOR SWITCHING AND CHIP CARD
US08/973,564 US6223990B1 (en) 1995-06-16 1996-06-13 Communication system including a dual passive antenna configuration
CA002224442A CA2224442C (en) 1995-06-16 1996-06-13 Semiconductor device, ic card utilizing the same and communication system
EP96917678A EP0832467B8 (en) 1995-06-16 1996-06-13 Semiconductor device, ic card utilizing the same and communication system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP7150605A JPH091968A (en) 1995-06-16 1995-06-16 Non-contact type ic card and information exchange system using the same
JP7/150605 1995-06-16
JP01046396A JP3546979B2 (en) 1996-01-24 1996-01-24 Semiconductor device and IC card device using the same
JP8/10463 1996-01-24

Publications (3)

Publication Number Publication Date
WO1997000493A2 WO1997000493A2 (en) 1997-01-03
WO1997000493A3 WO1997000493A3 (en) 1997-04-24
WO1997000493B1 true WO1997000493B1 (en) 1997-06-12

Family

ID=26345743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1996/001622 WO1997000493A2 (en) 1995-06-16 1996-06-13 Semiconductor device, ic card utilizing the same and communication system

Country Status (5)

Country Link
US (1) US6223990B1 (en)
EP (1) EP0832467B8 (en)
CN (1) CN1107922C (en)
DE (1) DE69637439T2 (en)
WO (1) WO1997000493A2 (en)

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