RFID tag

• US 8,596,544 B2
• Filed: 10/14/2010
• Issued: 12/03/2013
• Est. Priority Date: 08/09/2010
• Status: Active Grant

• Current Assignee: Hynix Semiconductor Incorporated (SK Hynix Inc.)
• Original Assignee: Hynix Semiconductor Incorporated (SK Hynix Inc.)
• Inventors: Kang, Hee-Bok
• Primary Examiner(s): Hess, Daniel
• Assistant Examiner(s): Savusdiphol, Paultep
• Application Number:
  US12/904,404
• Publication Number:
  US 20120031979A1
• Time in Patent Office: 1,146 Days
• Field of Search: 235/375, 235/380, 235/487, 235/435, 235/439, 235/492
• US Class Current: 235/492
• CPC Class Codes: G06K 19/0717 the sensor being capable of sensing environmental conditions such as temperature history or pressure

Abstract

An RFID tag includes an RFID chip, at least one sensor chip stacked on the RFID chip and interfaced with the RFID chip through a bump interface, and a filter layer stacked on the sensor chip to filter a sensing source introduced into the sensor chip.

Claims

1. A radio frequency identification (RFID) tag comprising:

an RFID chip;

a plurality of sensor chips formed on the RFID chip, in a direction perpendicular to a surface of the RFID chip, and interfaced with the RFID chip through a first bump interface; and

a plurality of filter layers, wherein each filter layer, of the plurality of filter layers, is formed on a corresponding sensor chip, of the plurality of sensor chips, and wherein each filter layer, of the plurality of filter layers, is to filter a corresponding input from a corresponding source, and to communicate the corresponding filtered input to the corresponding sensor chip of the plurality of sensor chips.

2. The RFID tag of claim 1, further comprising:

at least one antenna interfaced with the RFID chip through a second bump interface.

3. The RFID tag of claim 2, wherein the RFID chip is to communicate, via the antenna, information associated with the corresponding input to an external receiver.

4. The RFID tag of claim 1, wherein the plurality of sensor chips are to detect at least one of radiation, ionization, heat conduction, or vibration.

5. The RFID tag of claim 1, wherein the plurality of sensor chips are commonly connected to a sensor interface bus, and each sensor chip, of the plurality of sensor chips, is to transmit, via the sensor interface bus, information associated with the corresponding filtered input to the RFID chip.

6. The RFID tag of claim 5, wherein each sensor chip, of the plurality of sensor chips, is to transmit the information associated with the corresponding filtered input to the RFID chip at a different time.

7. A Radio Frequency Identification (RFID) tag comprising:

an RFID chip;

a first sensor chip formed on the RFID chip;

a first filter layer formed on the first sensor chip, wherein the first filter layer is to filter a first input, from a first source, and to communicate the filtered first input to the first sensor chip;

a second sensor chip formed on the first filter layer;

a second filter layer formed on the second sensor chip, wherein the second filter layer is to filter a second input, from a second source, and to communicate the filtered second input to the second sensor chip; and

a sensor interface bus to interface the first sensor chip and the second sensor chip with the RFID chip.

8. The RFID tag of claim 7, wherein the first sensor chip is formed on the RFID chip.

9. The RFID tag of claim 8, wherein the sensor interface bus is formed along sidewalls of the first sensor chip and the second sensor chip.

10. The RFID tag of claim 7, further comprising at least one antenna interfaced with the RFID chip through a second bump interface.

11. The RFID tag of claim 7, wherein a timing of an information exchange, via the sensor interface bus, between the RFID chip and the first sensor chip is different than a timing of an information exchange, via the sensor interface bus, between the RFID chip and the second sensor chip.

12. The RFID tag of claim 7, wherein the first filter layer is to filter a characteristic of the first input, communicated to the first sensor chip, and the second filter layer is to filter a characteristic of the second input, communicated to the second sensor chip.

13. A Radio Frequency Identification (RFID) tag comprising:

an RFID chip;

a plurality of sensing and filtering units alternately formed on the RFID chip, in a direction perpendicular to a surface of the RFID chip, the plurality of sensing and filtering units being interfaced with the RFID chip through a first bump interface, wherein each of the plurality of sensing and filtering units comprises;

a sensor chip; and

a filter layer formed on the sensor chip, wherein the filter layer is to filter an input from a corresponding source, and to communicate the filtered input to the sensor chip; and

at least one antenna interfaced with the REID chip through a second bump interface.

14. The RFID tag of claim 13, wherein the plurality of sensing and filtering units are to detect at least one of radiation, ionization, heat conduction, or vibration.

15. The RFID tag of claim 13, wherein the RFID chip is to receive, from each one of the plurality of sensing and filtering units, information associated with a corresponding input, received by each one of the plurality of sensing and filtering units, and to communicate, via the antenna, the information to an external receiver.

16. The RFID tag of claim 13, wherein the sensor chip is to communicate with the RFID chip via the first bump interface.

17. The RFID tag of claim 13, wherein the first bump interface is formed along sidewalls of sensor chip.

18. The RFID tag of claim 13, wherein a timing of an information exchange, via the first bump interface, between the RFID chip and one of the plurality of sensor chips, is different than a timing of an information exchange, via the first bump interface, between the RFID chip and another one of the plurality of sensor chips.

19. The RFID tag of claim 13, wherein the filter layer is to filter a characteristic of the input from the corresponding source, and to communicate the filtered characteristic to the sensor chip sensor chips.