Claims
- 1. For use in a tire pressure monitoring system, a frequency modulation (FM) radio frequency (RF) oscillator comprising:
a modulator configured to generate a modulation signal in response to a data input signal; and a generator configured to generate an FM output signal having a carrier frequency modulated by the modulation signal, wherein the generator comprises a frequency determining device.
- 2. The oscillator of claim 1 wherein the modulator comprises a diode configured to generate the modulation signal in response to the input signal.
- 3. The oscillator of claim 1 wherein the frequency determining device comprises a surface acoustic wave (SAW) device.
- 4. The oscillator of claim 1 wherein the oscillator comprises a Colpitts oscillator.
- 5. The oscillator of claim 1 wherein the frequency determining device is a crystal resonator or a ceramic resonator.
- 6. The oscillator of claim 1 wherein the oscillator is implemented for use in a remote keyless entry (RKE) system.
- 7. The oscillator of claim 1 wherein the generator comprises a single transistor.
- 8. For use in a tire pressure monitoring system, a method of generating a frequency modulation (FM) radio frequency (RF) output signal, the method comprising:
generating a modulation signal in response to a data input signal; generating an RF signal having a carrier frequency; and frequency modulating the carrier frequency of the RF signal with the modulation signal, wherein the RF signal is generated using a generator comprising a frequency determining device.
- 9. The method of claim 8 comprising generating the modulation signal using a diode.
- 10. The method of claim 8 wherein the frequency determining device comprises a surface acoustic wave (SAW) device.
- 11. The oscillator of claim 8 wherein the output signal is generated using a Colpitts oscillator.
- 12. The method of claim 8 wherein the frequency determining device is a crystal resonator or a ceramic resonator.
- 13. The method of claim 8 wherein the method is implemented for use in a remote keyless entry (RKE) system.
- 14. The method of claim 8 comprising generating the output signal using a single transistor.
- 15. For use in a remote keyless entry (RKE) system, a frequency modulation (FM) radio frequency (RF) oscillator comprising:
a modulator configured to generate a modulation signal in response to a data input signal; and a generator configured to generate an FM output signal having a carrier frequency modulated by the modulation signal, wherein the generator comprises a surface acoustic wave (SAW) device.
- 16. The oscillator of claim 15 wherein the modulator comprises a diode configured to generate the modulation signal in response to the input signal.
- 17. The oscillator of claim 15 wherein the SAW is configured to generate the carrier frequency and receive the modulation signal.
- 18. The oscillator of claim 15 wherein the oscillator comprises a Colpitts oscillator.
- 19. The oscillator of claim 15 wherein the oscillator is coupled to an amplifier or an antenna.
- 20. The oscillator of claim 15 wherein the generator comprises a single transistor.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of U.S. provisional application Serial No. 60/360,762 filed Mar. 1, 2002.
Provisional Applications (1)
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Number |
Date |
Country |
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60360762 |
Mar 2002 |
US |