Source: http://www.google.com/patents/US8203429?dq=5527183
Timestamp: 2017-06-27 15:02:19
Document Index: 2987893

Matched Legal Cases: ['Application No. 07251386', 'Application No. 07251386', 'Application No. 07251386', 'Application No. 2007201297', 'Application No. 07251385', 'Application No. 2007201297', 'Application No. 07251385', 'Application No. 07251385', 'Application No. 07251385', 'Application No. 07251386']

Patent US8203429 - Switched capacitance method for the detection of, and subsequent ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA transponder detector is provided with capabilities for detecting the presence and type of a transponder in its read range while operating at low power and also using a common antenna for detecting and executing data transactions with transponders....http://www.google.com/patents/US8203429?utm_source=gb-gplus-sharePatent US8203429 - Switched capacitance method for the detection of, and subsequent communication with a wireless transponder device using a single antennaAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8203429 B2Publication typeGrantApplication numberUS 12/416,104Publication dateJun 19, 2012Filing dateMar 31, 2009Priority dateApr 1, 2008Fee statusPaidAlso published asCA2661121A1, EP2107495A2, EP2107495A3, EP2107495B1, US20090251291Publication number12416104, 416104, US 8203429 B2, US 8203429B2, US-B2-8203429, US8203429 B2, US8203429B2InventorsEric J. BorcherdingOriginal AssigneeAssa Abloy AbExport CitationBiBTeX, EndNote, RefManPatent Citations (48), Non-Patent Citations (20), Referenced by (3), Classifications (10), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetSwitched capacitance method for the detection of, and subsequent communication with a wireless transponder device using a single antenna
US 8203429 B2Abstract
The transponder 12 comprises a number of functional elements including a transponder integrated circuit (IC) 12 a and a transponder antenna 12 b. The transponder IC 12 a embodies the processing and memory capabilities of the transponder 12. The transponder antenna 12 b is coupled to the transponder IC 12 a and is a conventional inductive antenna coil termed a “dual-function antenna coil” which performs both the receiving and transmitting functions of the transponder 12. Alternatively, two separate receiving and transmitting antenna coils (not shown) can be substituted for the single dual-function antenna coil in the transponder 12. The transponder 12 also preferably includes an external transponder tuning capacitor (not shown) coupled to the transponder IC 12 a and to each antenna coil of the transponder antenna 12 b. The term “external” is used above with respect to the transponder 12 to designate electronic components which are not physically or functionally included within the transponder IC 12 a. The term “tuning capacitor” is used herein to describe a capacitor preferably having a fixed capacitance which, in cooperation with the transponder antenna 12 b, establishes the transponder frequency of the transponder 12. The term “tuned resonant frequency” is used herein to describe a resonant frequency of the transponder LC circuit which is typically fixed at the time of transponder manufacture by selection of a specific transponder antenna and a specific cooperative tuning capacitor. Thus, the tuned resonant frequency of the transponder LC circuit in the transponder 12 is preferably non-adjustable after manufacture of the transponder. The term “transponder frequency” corresponds to the tuned resonant frequency of the transponder LC circuit in the transponder 12 and likewise to the carrier frequency of the transponder 12.
Referring to FIG. 4, an embodiment of a wakeup unit of the present invention is shown and designated 26 a. Elements of FIG. 4 which are specific embodiments of elements shown generally in FIG. 1 are designated by the same reference character, but with the suffix “a” added. The wakeup unit 26 a is configured to generate a serial progression of detection signals at a plurality of different frequencies. The wakeup unit 26 a comprises a detection signal generator circuit 40 a, a response signal receiver circuit 42 a, and a wakeup controller 44 a. In addition a cooperative antenna assembly 20 a is associated with the wakeup unit 26 a. The wakeup controller 44 a is provided with OP_AMP and DONE inputs 50, 52 to receive OP_AMP and DONE input signals, respectively. The wakeup controller 44 a is further provided with TAGREC, PING, SELECT1, SELECT2, and DETCLR outputs, 54, 56, 58, 59, 60 to send TAGREC, PING, SELECT1, SELECT2, and DETCLR output signals, respectively, which are generated by the wakeup controller 44 a. The wakeup controller 44 a of the present embodiment is shown having two select signal outputs, i.e., SELECT1 output 58 and SELECT2 output 59, for purposes of illustration. It is within the scope of the present invention, for the wakeup controller 44 to have any integer number N of select signal outputs. Accordingly, each select signal output of the wakeup controller 44 is generally designated SELECTX output, on which a SELECTX output signal generated by the wakeup controller 44 is sent, wherein X=1, 2, 3 . . . N. The precise value of X for a given embodiment of the wakeup controller 44 is determined by the number of switched resistor/capacitor pairs in the detection signal generator circuit 40 a as described below.
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No. 12/822,397, mailed Jun. 20, 2011 11 pages.17Official Communication for European Patent Application No. 07251385.6, dated May 7, 2009.18Official Communication for European Patent Application No. 07251385.6, dated Oct. 20, 2009.19Search Opinion for European Patent Application No. EP 09156982, dated May 9, 2011 6 pages.20Written Opinion for European Application No. 07251386.4, mailed Mar. 6, 2008.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8867990 *Feb 29, 2012Oct 21, 2014Broadcom CorporationDetecting a presence of near field communications (NFC) devicesUS9026048Dec 14, 2011May 5, 2015Broadcom CorporationDetecting a presence of near field communications (NFC) devicesUS20130225071 *Feb 29, 2012Aug 29, 2013Broadcom CorporationDetecting a Presence of Near Field Communications (NFC) Devices* Cited by examinerClassifications U.S. Classification340/10.1, 340/572.7, 340/572.5, 340/10.3, 340/572.4International ClassificationH04Q5/22Cooperative ClassificationG06K7/0008, G06K7/10128European ClassificationG06K7/00E, G06K7/10A2ALegal EventsDateCodeEventDescriptionJun 26, 2009ASAssignmentOwner name: ASSA ABLOY AB, SWEDENFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BORCHERDING, ERIC J.;REEL/FRAME:022880/0570Effective date: 20090529Dec 2, 2015FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services