Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-01-26
2008-07-29
Bugg, George A (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S572400, C340S010400, C340S870030
Reexamination Certificate
active
07405659
ABSTRACT:
An RFID tag that receives an RF signal from a reader is arranged to derive a threshold signal from a detected envelope of the RF signal, where the threshold signal is proportional to the detected envelope signal. The detected envelope signal is then compared to the threshold signal to derive a digital signal from the received RF signal. By maintaining the threshold signal proportional to the detected envelope signal, false bit detections due to ripple effect on the received signal and interference from other sources are reduced. The threshold signal may be derived employing a switched capacitor attenuator circuit.
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A) EPCglobal, Inc. “Specification for RFID Air Interface-EPC Radio-Frequency Identity Protocols Class-1 Generation-2 UHF RFID Protocol for Communications [continued below] [continued] at 860 MHz-960 MHz, Version 1.1.0” (a.k.a. “The Gen 2 Spec”.) EPCglobal Inc., Dec. 17, 2005. <http://www.epcglobalinc.org>.
(B) EPCglobal Inc. “Specification for RFID Air Interface-EPC Radio-Frequency Identity Protocols Class-1 Generation-2 UHF RFID Protocol for Communications [continued below] [continued] at 860 MHz-960 MHz, Version 1.0.8.” EPCglobal Inc., Dec. 14, 2004. <http://www.epcglobalinc.org>.
(C) Declaration of Stacy L. Jones authenticating attached Website Materials as accessed and posted at http://www.autoid.org/SC31/sc—31—wg4—sg3.htm on Sep. 1, 2006.
Bugg George A
Impinj, Inc.
Previl Daniel
Turk Carl K.
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