Patent ID: 9333815
Filing Date: 2016-05-10
CPC Classification: B60C,H04B

Claim Text:
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, and wherein the RF sub-module comprises a fractional-N Phase Locked Loop (PLL) circuit.