| US 7,602,274 B2 | ||
| Dynamic configuration of a radio frequency transponder | ||
| Thomas Youbok Lee, Chandler, Ariz. (US); James B. Nolan, Chandler, Ariz. (US); Steve Vernier, Phoenix, Ariz. (US); Ruan Lourens, Chandler, Ariz. (US); Vivien Delport, Chandler, Ariz. (US); Alan Lamphier, Elk Rapids, Mich. (US); and Glen Allen Sullivan, Tempe, Ariz. (US) | ||
| Assigned to Microchip Technology Incorporated, Chandler, Ariz. (US) | ||
| Filed on Mar. 14, 2005, as Appl. No. 11/79,719. | ||
| Claims priority of provisional application 60/564828, filed on Apr. 23, 2004. | ||
| Prior Publication US 2005/0237163 A1, Oct. 27, 2005 | ||
| Int. Cl. H04Q 5/22 (2006.01); G05B 19/00 (2006.01); G06F 7/04 (2006.01); H04B 1/00 (2006.01) | ||
| U.S. Cl. 340—10.2 [340/10.4; 340/10.51; 340/5.61; 340/426.36; 340/425.5; 342/27; 342/44] | 91 Claims |
| 1. A remote keyless entry (RKE) transponder, comprising:
a multi-channel analog front-end (AFE) and a plurality of antennas, wherein each channel of the multi-channel AFE is coupled
to a one of the plurality of antennas;
a tuning circuit for each channel of the multi-channel AFE, each tuning circuit having a plurality of tuning capacitors internal
to the multi-channel AFE, wherein the tuning circuit couples a combination of the plurality of tuning capacitors to a respective
one of the plurality of antennas so that the respective one of the plurality of antennas is tuned to a desired frequency;
at least one antenna configuration register for storing each combination of the plurality of capacitors required for tuning
each of the respective ones of the plurality of antennas; and
a low frequency talk-back circuit for sending data back to a low frequency base station, wherein the low frequency talk-back
circuit comprises a de-queuing circuit for clamping and unclamping a voltage on at least one of the plurality of antennas,
wherein the dc-queuing circuit is controlled by an external control device.
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