Dynamic configuration of a radio frequency transponder
First Claim
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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Accused Products
Abstract
A multi-channel remote keyless entry (RKE) transponder having dynamically re-configurable input channel selection, channel disable, settable sensitivity for each channel, wake-up filter timing parameters, automatic gain control hold, internal tuning capacitor selection for each channel'"'"'s antenna, minimum modulation depth requirement for input signal and bi-directional talk-back. Programmable minimum modulation depth requirement reduces false wake-up of the RKE transponder. An antenna for each channel of the RKE transponder may be tuned with internal tuning capacitors for improved range and receiver sensitivity. The internal tuning capacitor parameters may be stored in a configuration register. Gain of the channel may be fixed while the antenna is tuned. The antennas may be de-queued for talk-back to a base station for low frequency bi-directional communications. An external control device may dynamically read from and write to the configuration registers via a serial communications interface.
62 Citations
91 Claims
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1. A remote keyless entry (RKE) transponder, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A method for a remote keyless entry (RKE) transponder, said method comprising the steps of:
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providing a multi-channel analog front-end (AFE); providing an antenna for each channel of the multi-channel AFE; coupling each channel to its respective antenna; tuning each channel antenna to a desired frequency by coupling some combination of a plurality of tuning capacitors to the channel antenna; storing, in at least one configuration register, the combinations of the plurality of tuning capacitors used to tune each of the channel antennas to the desired frequency; and sending data back to a low frequency base station by clamping and unclamping a voltage on at least one of the antennas. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91)
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Specification