System and method for using a saw based RF transmitter for AM modulated transmission in a TPM
First Claim
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1. For use in a tire pressure monitoring system, an amplitude modulation (AM) radio frequency (RF) oscillator comprising:
- a modulator comprising a diode configured to generate a modulation signal in response to a data input signal; and
a generator configured to generate an AM output signal having an RF carrier frequency and an envelope, wherein the envelope is amplitude modulated by the modulation signal and the generator comprises a frequency determining device that includes a surface acoustic wave (SAW) device.
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Abstract
For use in a tire pressure monitoring system, an amplitude modulation (AM) radio frequency (RF) oscillator includes a modulator and a generator. The modulator may be configured to generate a modulation signal in response to a data input signal. The generator may be configured to generate an AM output signal having an RF carrier frequency and an envelope, wherein the envelope is amplitude modulated by the modulation signal and the generator includes a frequency determining device.
125 Citations
15 Claims
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1. For use in a tire pressure monitoring system, an amplitude modulation (AM) radio frequency (RF) oscillator comprising:
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a modulator comprising a diode configured to generate a modulation signal in response to a data input signal; and
a generator configured to generate an AM output signal having an RF carrier frequency and an envelope, wherein the envelope is amplitude modulated by the modulation signal and the generator comprises a frequency determining device that includes a surface acoustic wave (SAW) device. - View Dependent Claims (2, 3, 4, 5)
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6. For use in a tire pressure monitoring system, a method of generating an amplitude modulation (AM) radio frequency (RF) output signal, the method comprising:
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generating a modulation signal in response to a data input signal using a diode;
generating an AM output signal having a carrier frequency and an envelope; and
amplitude modulating the envelope of the output signal with the modulation signal, wherein the output signal is generated using a generator comprising a frequency determining device that includes a surface acoustic wave (SAW) device. - View Dependent Claims (7, 8, 9, 10)
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11. For use in a remote keyless entry (RKE) system, an amplitude modulation (AM) radio frequency (RF) oscillator comprising:
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a modulator comprising a diode configured to generate a modulation signal in response to a data input signal; and
a generator configured to generate an AM output signal having an RF carrier frequency and an envelope, wherein the envelope is amplitude modulated by the modulation signal and the generator comprises a surface acoustic wave (SAW) device. - View Dependent Claims (12, 13, 14, 15)
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Specification