Multi-frequency tire pressure monitoring detector
First Claim
1. A tire pressure detection apparatus, comprising:
- a pressure sensor configured to output a pressure signal;
a control module communicatively coupled with the pressure sensor and configured to modulate information related to the pressure signal onto an output signal, the output signal having a frequency that is selectable from at least a first frequency and a second frequency;
an RF matching circuit coupled with the control module;
an antenna coupled with the RF matching circuit; and
a reference oscillator that outputs a reference signal at a predetermined frequency,wherein the control module comprises an RF sub-module configured to receive the reference signal and generate the output signal based on a multiplier applied to the reference signal, the value of the multiplier selectable from at least a first multiplier value corresponding to the first frequency and second multiplier value corresponding to the second frequency, andwherein the RF sub-module comprises a fractional-N Phase Locked Loop (PLL) circuit.
1 Assignment
0 Petitions
Reexamination
Accused Products
Abstract
Methods, systems, and devices are provided for tire pressure detectors that may operate according to one of two or more selectable frequencies. Tire pressure detectors may include an RF section to modulate pressure information from a pressure sensor onto an output signal. The frequency of the output signal may be selectable from two or more frequencies based on a frequency required by a vehicle that the tire pressure detector is to be used with. An RF matching circuit may be coupled between the RF section and an antenna, with an impedance of the RF matching circuit selected based of the frequency of the output signal. Such impedance matching may provide a constant power level output from the tire pressure detector independent of the frequency of the tire pressure detector transmissions.
5 Citations
15 Claims
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1. A tire pressure detection apparatus, comprising:
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a pressure sensor configured to output a pressure signal; a control module communicatively coupled with the pressure sensor and configured to modulate information related to the pressure signal onto an output signal, the output signal having a frequency that is selectable from at least a first frequency and a second frequency; an RF matching circuit coupled with the control module; an antenna coupled with the RF matching circuit; and a reference oscillator that outputs a reference signal at a predetermined frequency, wherein the control module comprises an RF sub-module configured to receive the reference signal and generate the output signal based on a multiplier applied to the reference signal, the value of the multiplier selectable from at least a first multiplier value corresponding to the first frequency and second multiplier value corresponding to the second frequency, and wherein the RF sub-module comprises a fractional-N Phase Locked Loop (PLL) circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for frequency selection in a tire pressure detector, comprising:
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determining an operating frequency at which the tire pressure detector is to transmit RF signals; determining a protocol that is to be used to communicate information from the tire pressure detector; configuring a frequency switch in the tire pressure detector based on the determined operating frequency, wherein configuring the frequency switch comprises selecting a multiplier at a fractional-N PLL circuit responsive to the determined operating frequency; and programming the tire pressure detector to communicate information according to the determined protocol. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification