Claims
- 1. Apparatus for generating a signal having low-phase noise, said apparatus comprising:a frequency reference oscillator; a frequency divider coupled to said frequency reference oscillator; a voltage controlled oscillator coupled to said frequency divider and phase locked to a frequency based upon said frequency reference oscillator; and an up-converter coupled to said voltage controlled oscillator, wherein a divide ratio of said frequency divider being selected to produce multiple exciter output frequencies of at least 18 GHz with an integrated phase noise of no greater than −40 dBc.
- 2. Apparatus according to claim 1, further comprising:a pulse former coupled to said frequency reference oscillator for producing a pulsed output.
- 3. Apparatus according to claim 2, wherein said multiple exciter output frequencies are separated from one another by 25 MHz.
- 4. Apparatus according to claim 1, wherein said multiple exciter output frequencies are separated from one another by at least one MHz.
- 5. An apparatus for generating a communication band signal with reduced phase noise comprising:a frequency reference oscillator for generating a reference frequency; a voltage controlled oscillator for generating a synthesized output frequency based upon the reference frequency; a phase locked oscillator for generating an up-conversion frequency based upon the reference frequency; a first mixer for mixing the synthesized output frequency and the up-conversion frequency to generate a frequency output; and means for producing multiple frequency outputs of at least 18 GHz with an integrated phase noise of no greater than −40 dBc.
- 6. Apparatus according to claim 5, wherein said reference frequency is 50 MHz and the synthesized output frequency is 1.2 to 1.525 GHz.
- 7. Apparatus according to claim 5, wherein said frequency outputs are 18.15 to 18.475 GHz, and supplied over 14 channels with 25 MHz spacing.
- 8. Apparatus according to claim 5, wherein a power level of said frequency outputs are approximately 10 to 16 dB.
- 9. The apparatus according to claim 5, comprising:a coupler connected to an output of the voltage controlled oscillator; a feedback path frequency divider connected to the coupler; a multiplexer connected to the feedback path frequency divider; and an integrator connected between the multiplexer and an input of the voltage controlled oscillator.
- 10. The apparatus according to claim 9, comprising:a reference frequency divider connected between the frequency reference oscillator and the multiplexer.
- 11. The apparatus according to claim 9, wherein the integrator is an operational amplifier.
- 12. The apparatus according to claim 11, wherein an output of the operational amplifier is couple to an input of the operational amplifier through a resistor and a capacitor.
- 13. An apparatus for generating a communication band signal with reduced phase noise comprising:a frequency reference oscillator for generating a reference frequency; a first voltage controlled oscillator for generating a first synthesized output frequency based upon the reference frequency; a second voltage controlled oscillator for generating a second synthesized output frequency based upon the reference frequency; a first mixer for mixing the second synthesized output frequency and an up-conversion frequency based upon the first synthesized output frequency to create a frequency output; and means for producing multiple frequency outputs.
- 14. Apparatus according to claim 13, wherein said reference frequency is 30 MHz.
- 15. The apparatus according to claim 13, comprising:a pulse former using the first synthesized output frequency for generating a pulsed intermediate frequency; a multiplier for multiplying the frequency output to create a multiplied frequency output; and a mixer for mixing the multiplied frequency output and the pulsed intermediate frequency.
- 16. The apparatus according to claim 13, comprising:a multiplier for multiplying a frequency output to create a multiplied frequency output; and a mixer for mixing the multiplied frequency output and a received signal.
- 17. The apparatus according to claim 13, comprising:a coupler connected to an output of the second voltage controlled oscillator; a feedback path frequency divider coupled to the coupler; a multiplexer coupled to the feedback path frequency divider; and an integrator coupled between the multiplexer and an input of the second voltage controlled oscillator.
- 18. The apparatus according to claim 17, comprising:a reference frequency divider coupled between the frequency reference oscillator and the multiplexer.
- 19. The apparatus according to claim 18, wherein a divide ratio of at least one of the reference frequency divider and the feedback path divider being selected to provide a channel step size of the frequency outputs.
- 20. A method for generating a communication band signal with reduced phase noise comprising:generating a reference frequency from a frequency reference oscillator; generating a synthesized output frequency based upon the reference frequency with a voltage controlled oscillator in a phase locked loop; generating an up-conversion frequency based upon the reference frequency; mixing the synthesized output frequency and the up-conversion frequency to generate a frequency output; and producing multiple frequency outputs of at least 18 GHz with an integrated phase noise of no greater than −40 dBc.
- 21. The method of claim 20, wherein producing multiple frequency outputs includes selecting divide ratios for a frequency divider in a feedback path of the phase locked loop.
- 22. A method for generating a communication band signal with reduced phase noise comprising:generating a reference frequency; generating a first synthesized output frequency based upon the reference frequency; generating a second synthesized output frequency based upon the reference frequency with a voltage controlled oscillator in a phase locked loop; mixing the second synthesized output frequency and an up-conversion frequency based upon the first synthesized output frequency to create a frequency output of at least 15 GHz; and selecting divide ratios for a frequency divider in a feedback path of the phase locked loop to produce multiple frequency outputs.
- 23. The method according to claim 22, comprising:generating a pulsed intermediate frequency using the first synthesized output frequency; multiplying the frequency output to create a multiplied frequency output; and mixing the multiplied frequency output and the pulsed intermediate frequency.
- 24. The method according to claim 22, comprising:multiplying a frequency output to create a multiplied frequency output; and mixing the multiplied frequency output and a received signal.
RELATED APPLICATIONS
The present application is a continuation-in-part of U.S. Application Ser. No. 09/185,579, filed Nov. 4, 1998, now U.S. Pat. No. 6,442,374, and entitled: METHOD AND APPARATUS FOR HIGH FREQUENCY WIRELESS COMMUNICATION, the disclosure of which is hereby incorporated by reference in its entirety.
US Referenced Citations (12)
Non-Patent Literature Citations (1)
Entry |
A Completley Integrated Single-Chip PLL with a 34 GHz VCO Using 0.2um E-/D-HEMT-Technology, 1997. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/185579 |
Nov 1998 |
US |
Child |
09/227831 |
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US |