Data carrier with controllable supply voltage generation means

• US 6,597,893 B2
• Filed: 08/17/2001
• Issued: 07/22/2003
• Est. Priority Date: 07/31/2000
• Status: Expired due to Term

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Zettler, Werner
• Primary Examiner(s): MAUNG, NAY AUNG
• Application Number:
  US09/932,106
• Publication Number:
  US 20020054653A1
• Time in Patent Office: 704 Days
• Field of Search: 455/41, 455/73, 455/106, 342/44-51, 235/382
• US Class Current: 455/41.1
• CPC Class Codes: G06K 19/0701 at least one of the integrated circuit chips comprising an arrangement for power management
• 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 carrier (1) on which a carrier signal (TS) can be applied to an electric circuit (3), comprises supply voltage generation means (6) which are arranged for generating a DC supply voltage (U) that can be tapped from a supply tapping point (10) while use is made of the carrier signal (TS), and further includes control means (11) for controlling the DC supply voltage (U) in accordance with a controlled variable signal (CV) that represents the carrier signal (TS) occurring at a control means circuit point (20), and further includes decoupling means (49) with the aid of which the control means circuit point (20) and the supply circuit point (10) can be decoupled from each other.

Claims

1. A data carrier (1) comprising an electric circuit (3)

which circuit has a circuit terminal (4) for supplying a carrier signal (TS), and includes supply voltage generation means (6) for generating a DC supply voltage (U) while the carrier signal (TS) is used, and

which has a supply circuit point (10) from which the DC supply voltage (U) can be tapped, and

which includes control means (11) for controlling the DC supply voltage (U) in accordance with a controlled variable signal (CV) that occurs at a control means circuit point (20) and represents the carrier signal (TS),

characterized in that decoupling means (49) are provided with the aid of which the supply circuit point (10) and the control means circuit point (20) can be decoupled from each other.

2. A data carrier (1) as claimed in claim 1, characterized in that the decoupling means (49) are formed by a diode configuration (9).

3. A data carrier (1) as claimed in claim 1, characterized

in that load modulation means (28) are provided for receiving a modulation signal (MS) and for modulating the load of the carrier signal (TS) in accordance with the modulation signal (MS) and

in that the load modulation means (28) are formed by parts of the control means (11) and in that the control means (11) are arranged for receiving the modulation signal (MS) and for modulating the load of the carrier signal (TS) in accordance with the modulation signal (MS).

4. A data carrier (1) as claimed in claim 3, characterized in that a controlled variable signal generator (12) is provided for generating the controlled variable signal (CV) and

in that the controlled variable signal generator (12) has a generator input (16) which is connected to the circuit terminal (4) and

in that the controlled variable signal generator (12) has a generator output (17) for supplying the controlled variable signal (CV) and which forms the control means circuit point (20) and in that in the controlled variable signal generator (12) are included control means (33) for receiving the modulation signal (MS) and for controlling the controlled variable signal (CV) in accordance with the modulation signal (MS).

5. A data carrier (1) as claimed in claim 4, characterized in that the controlled variable signal generator (12) is formed by a voltage divider (34) and in that the voltage divider (34) has at least a first tapping point (P) and a second tapping point (Q).

6. A data carrier (1) as claimed in claim 5, characterized in that the control means (33) are formed by tapping means (38) for tapping the controlled variable signal (CV) from the first tapping point (P) of the voltage divider (34) or from the second tapping point (Q) of the voltage divider (34) in accordance with the modulation signal (MS).

7. A data carrier (1) as claimed in claim 6, characterized in that the tapping means (38) are formed by a transistor configuration (39).

8. A data carrier as claimed in claim 1, characterized in that the electric circuit (3) of the data carrier (1) is arranged as an integrated circuit.

12. A circuit (3) as claimed in claim 1, characterized

in that a controlled variable signal generator (12) is provided for generating the controlled variable signal (CV) and

in that the controlled variable signal generator (12) has a generator input (16) which is connected to the circuit terminal (4) and

in that the controlled variable signal generator (12) has a generator output (17) for supplying the controlled variable signal (CV) and which forms the control means circuit point (20) and in that in the controlled variable signal generator (12) are included control means (33) for receiving the modulation signal (MS) and for controlling the controlled variable signal (CV) in accordance with the modulation signal (MS).

13. A circuit (3) as claimed in claim 12, characterized

in that the controlled variable signal generator (12) is formed by a voltage divider (34) and in that the voltage divider (34) has at least a first tapping point (P) and a second tapping point (Q).

14. A circuit (3) as claimed in claim 13, characterized in that the control means (33) are formed by tapping means (38) for tapping the controlled variable signal (CV) from the first tapping point (P) of the voltage divider (34) or from the second tapping point (Q) of the voltage divider (34) in accordance with the modulation signal (MS).

15. A circuit (3) as claimed in claim 14, characterized in that the tapping means (38) are formed by a transistor configuration (39).

9. A circuit (3) for a data carrier

which has a circuit terminal for supplying a carrier signal (TS) and

which includes supply voltage generation means (6) for generating a DC supply voltage (U) while the carrier signal (TS) is used and

which includes a supply circuit point (10) from which the DC supply voltage (U) can be tapped and

which includes control means (11) for controlling the DC supply voltage (U) in accordance with a controlled variable signal (CV) that occurs at a control means circuit point (20) and represents the carrier signal (TS),

characterized in that decoupling means (49) are provided by which the supply circuit point (10) and the control means circuit point (20) can be decoupled from each other.

10. A circuit (3) as claimed in claim 9, characterized in that the decoupling means (49) are formed by a diode configuration (9).

11. A circuit (3) as claimed in claim 9, characterized

in that load modulation means (28) are provided for receiving a modulation signal (MS) and modulating the load of the carrier signal (TS) in accordance with the modulation signal (MS) and

in that the load modulation means (28) are formed by parts of the control means (11) and in that the control means (11) are arranged for receiving the modulation signal (MS) and for modulating the load of the carrier signal (TS) in accordance with the modulation signal (MS).

16. A circuit (3) as claimed in claim 9, characterized in that the circuit (3) is arranged as an integrated circuit.