Integrated circuit transporter and a method of communication therefor

• US 6,091,935 A
• Filed: 10/07/1997
• Issued: 07/18/2000
• Est. Priority Date: 10/07/1997
• Status: Expired due to Term

• Current Assignee: Microchip Technology Incorporated
• Original Assignee: Microchip Technology Incorporated
• Inventors: Alexander, Sam, Furey, Lee
• Primary Examiner(s): LE, THANH C
• Application Number:
  US08/946,428
• Time in Patent Office: 1,015 Days
• Field of Search: 455/41, 455/44, 455/73, 455/78, 455/80, 455/106, 455/38.1, 455/38.3, 455/343, 455/572, 455/573, 340/825.54, 340/825.69
• 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

An improved integrated circuit transponder device is presented comprising, in combination, a single, externally wireless package enclosing an integrated circuit semiconductor chip, a coil within the package being selectively exposed to an electromagnetic field, and a detection portion on the integrated circuit semiconductor chip and being coupled to each end of the coil for detecting when voltages at each end of the coil are approximately equal over a period of time. The detection portion includes an exclusive NOR gate coupled to each end of the coil for determining when the coil voltages are equal, and the output of the exclusive NOR gate is input to a filter before being delivered to the remainder of the device circuitry.

Claims

1. An integrated circuit transponder device comprising, in combination:

a single package enclosing an integrated circuit semiconductor chip;

a coil within said package being selectively exposed to an electromagetic filed; and

detection means on said integrated circuit semiconductor chip and being coupled to each end of said coil for detecting when voltages at each end of said coil are approximately equal over a period of time, said detection means includes an exclusive NOR gate coupled to each end of said coil;

wherein one end of said coil is input to a first pair of serially connected inverters having an output connected to a first input of said exclusive NOR gate, and wherein another end of said coil is input to a second pair of serially connected inverters having an output connected to a second input of said exclusive NOR gate.

2. A method of operating an integrated circuit transponder device comprising the steps of:

providing a single package enclosing an integrated circuit semiconductor chip;

providing a coil within said package being selectively exposed to an electromagetic field; and

providing detection means on said integrated circuit semiconductor chip and being coupled to each end of said coil for detecting when voltages at each end of said coil are approximately equal over a period of time, said step of providing said detection means includes the step of providing an exclusive NOR gate coupled to each end of said coil;

wherein one end of said coil is input to a first pair of serially connected inverters having an output connected to a first input of said exclusive NOR gate, and wherein another end of said coil is input to a second pair of serially connected inverters having an output connected to a second pair of said exclusive NOR gate.