Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-10-03
2006-10-03
Lieu, Julie Bichngoc (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S644000, C340S664000, C365S189050, C365S204000, C711S100000, C711S103000
Reexamination Certificate
active
07116240
ABSTRACT:
A Radio-Frequency Identification (RFID) transponder is provided. The RFID transponder may include a basic ID flag circuit having a VDD voltage node, an output voltage node, and a capacitor coupled to the VDD voltage node and the output voltage node to store an ID flag. The persistence duration of the state of the ID flag is controlled by maintaining a charge and leakage circuit. The charge and leakage circuit includes an NMOS device having a source, a drain and a gate, the source node of the NMOS device being coupled to the capacitor and the drain node of the NMOS device being coupled to a first CMOS inverter. The first CMOS inverter is powered by a regulated supply voltage such that the voltage on the capacitor is not dependent on the forward voltage drop of the NMOS device.
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EPC Radio-Frequency Identity Protocols Generation 2 Identity Tag (Class 1): Protocol for Communications at 860 MHz-960 Mhz, Last-Call Working Draft Version 1.0.2, Nov. 24, 2003, 66 pages.
Blakely , Sokoloff, Taylor & Zafman LLP
Impinj, Inc.
Lieu Julie Bichngoc
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