Data carrier for processing signal stream according to transmission protocols has an active processing circuit and a passive signal processing circuit with power supplies

• US 7,272,729 B2
• Filed: 07/31/2002
• Issued: 09/18/2007
• Est. Priority Date: 08/08/2001
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Spiess, Bernhard Georg, Erdeniz, Pamir, Janesch, Werner
• Primary Examiner(s): Cao; Chun
• Application Number:
  US10/486,160
• Publication Number:
  US 20040257733A1
• Time in Patent Office: 1,875 Days
• Field of Search: 713/300, 713/320, 713/324, 340/5.1, 340/10.4, 340/10.34
• US Class Current: 713/300
• CPC Class Codes: G06K 19/0705 the battery being connected to a power saving arrangement
• 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

In a data carrier (1) and in an integrated circuit (5), a first signal processing circuit (8) with a signal-independent power supply is provided for processing a signal stream (SF1) in accordance with a first transmission protocol, and a second signal processing circuit (9) with a signal-dependent power supply is provided for processing a signal stream (SF2) in accordance with a second transmission protocol, which signal stream (SF2) in accordance with the second transmission protocol comprises a signal characteristic, namely a lead signal (VLS), and a detection circuit (25) is provided, which detection circuit is designed for detecting the lead signal (VLS) and ensuring the supplying of the second signal processing circuit (9) with power from a power source (14) provided for the second signal processing circuit (9) following a recognition of the occurrence of the lead signal (VLS).

Claims

1. A data carrier with an integrated circuit,

wherein a first signal processing circuit with a signal-independent power supply is provided, and

wherein a second signal processing circuit with a signal-dependent power supply is provided, and

wherein the first signal processing circuit is designed to receive and process a signal stream in accordance with a first transmission protocol, and

wherein the second signal processing circuit is designed to receive and process a signal stream in accordance with a second transmission protocol, which signal stream in accordance with the second transmission protocol comprises a signal characteristic, and

wherein a first power source is provided to supply the first signal processing circuit with power, and

wherein a second power source is provided to supply the second signal processing circuit with power, and

wherein detection means are provided, which detection means are designed for detecting the signal characteristic in the signal stream in accordance with the second transmission protocol, and are also designed for initiating the supplying of at least one part of the second signal processing circuit with power from the second power source following a recognition of the occurrence of the signal characteristic.

2. A data carrier as claimed in claim 1,

wherein the second signal processing circuit is designed to receive and process a signal stream in accordance with the second transmission protocol, wherein the signal characteristic of this signal stream is formed by a lead signal with a specific minimum duration, and

wherein the detection means are designed for detecting the lead signal.

3. A data carrier as claimed in claim 2,

wherein the second signal processing circuit is designed to receive and process a signal stream in accordance with the second transmission protocol, wherein the lead signal forming the signal characteristic is formed by an unmodulated carrier signal, and

wherein detection means are designed for detecting the unmodulated carrier signal forming the lead signal.

4. A data carrier as claimed in claim 1,

wherein data processing means are provided, which data processing means are related to both the first signal processing circuit and the second signal processing circuit, and

wherein, between the first power source and the data processing means, are provided first controllable switching means, and

wherein, between the second power source and the data processing means, are provided second controllable switching means, and

wherein a control stage is provided to control the first switching means and the second switching means, and

wherein the control stage is connected to the detection means and can be controlled by detection means in such a manner that, following recognition of the occurrence of the signal characteristic, the second controllable switching means are controlled into a switching state that connects the data processing means to the second power source.

5. An integrated circuit,

wherein a first signal processing circuit with a signal-independent power supply is provided, and

wherein a second signal processing circuit with a signal-dependent power supply is provided, and

wherein the first signal processing circuit is designed to receive and process a signal stream in accordance with a first transmission protocol, and

wherein the second signal processing circuit is designed to receive and process a signal stream in accordance with a second transmission protocol, which signal stream in accordance with the second transmission protocol comprises a signal characteristic, and

wherein a first power source is provided to supply the first signal processing circuit with power, and

wherein a second power source is provided to supply the second signal processing circuit with power, and

wherein detection means are provided, which detection means are designed for detecting the signal characteristic in the signal stream in accordance with the second transmission protocol, and are also designed for initiating the supplying of at least one part of the second signal processing circuit with power from the second power source following a recognition of the occurrence of the signal characteristic.

6. An integrated circuit as claimed in claim 5,

wherein the second signal processing circuit is designed to receive and process a signal stream in accordance with the second transmission protocol, wherein the signal characteristic of this signal stream is formed by a lead signal with a specific minimum duration, and

wherein the detection means are designed for detecting the lead signal.

7. An integrated circuit as claimed in claim 6,

wherein the second signal processing circuit is designed to receive and process a signal stream in accordance with the second transmission protocol, wherein the lead signal forming the signal characteristic is formed by an unmodulated carrier signal, and

wherein the detection means are designed for detecting the unmodulated carrier signal forming the lead signal.

8. An integrated circuit as claimed in claim 5,

wherein data processing means are provided, which data processing means are related to both the first signal processing circuit and the second signal processing circuit, and

wherein, between the first power source and the data processing means, are provided first controllable switching means, and

wherein, between the second power source and the data processing means, are provided second controllable switching means, and

wherein a control stage is provided to control the first switching means and the second switching means, and

wherein the control stage is connected to the detection means and can be controlled by detection means in such a manner that, following recognition of the occurrence of the signal characteristic, the second controllable switching means are controlled into a switching state that connects the data processing means to the second power source.