Fast hopping frequency synthesizer
First Claim
1. A frequency synthesizer for use in a fast frequency hopping communications device, the frequency synthesizer comprising:
- a plurality of oscillators, each oscillator having a first input coupled to a reference clock frequency signal, and each oscillator comprising an injection locked oscillator configured to be injection locked to a harmonic of a reference clock frequency of the reference clock frequency signal, wherein a first oscillator of the plurality of oscillators is configured to be injection locked to one harmonic of the reference clock frequency and a second oscillator of the plurality of oscillators is configured to be simultaneously injection locked to a different harmonic of the reference clock frequency; and
a signal selector having a control signal input and a plurality of reference clock inputs, each reference clock input coupled to an output from an oscillator in the plurality of oscillators, the signal selector to couple a reference clock input to an output based on a control signal provided by the control signal input.
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Abstract
Apparatus and systems for synthesizing frequencies for use in a fast hopping wireless communications system. A frequency synthesizer comprises a plurality of oscillators with each oscillator having a first input coupled to a reference clock frequency signal, and a signal selector having a control signal input and a plurality of reference clock inputs with each reference clock input coupled to an output from an oscillator. Each oscillator produces a reference frequency that is a harmonic of a reference clock frequency of the reference clock frequency signal, and the signal selector couples a reference clock input to an output based on a control signal provided by the control signal input.
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Citations
18 Claims
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1. A frequency synthesizer for use in a fast frequency hopping communications device, the frequency synthesizer comprising:
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a plurality of oscillators, each oscillator having a first input coupled to a reference clock frequency signal, and each oscillator comprising an injection locked oscillator configured to be injection locked to a harmonic of a reference clock frequency of the reference clock frequency signal, wherein a first oscillator of the plurality of oscillators is configured to be injection locked to one harmonic of the reference clock frequency and a second oscillator of the plurality of oscillators is configured to be simultaneously injection locked to a different harmonic of the reference clock frequency; and a signal selector having a control signal input and a plurality of reference clock inputs, each reference clock input coupled to an output from an oscillator in the plurality of oscillators, the signal selector to couple a reference clock input to an output based on a control signal provided by the control signal input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A fast hopping communications device comprising a receiver to receive transmissions over multiple frequency bands, the receiver comprising:
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a first amplifier coupled to a radio frequency input, the first amplifier to change a signal level of a radio frequency signal provided by the radio frequency input to create an amplified radio frequency signal; a frequency synthesizer to produce a receiver reference frequency for a frequency band over which the radio frequency signal is being received, the frequency synthesizer comprising a plurality of oscillators, one oscillator per frequency band, each oscillator coupled to a reference clock frequency signal input, and each oscillator comprising an injection locked oscillator configured to be injection locked to a harmonic of a reference clock frequency signal provided by the reference clock frequency signal input, wherein a first oscillator of the plurality of oscillators is configured to be injection locked to one harmonic of the reference clock frequency and a second oscillator of the plurality of oscillators is configured to be simultaneously injection locked to a different harmonic of the reference clock frequency, and a first signal selector having a first control signal input and a plurality of first reference clock inputs, each first reference clock input coupled to an output from an oscillator in the plurality of oscillators, the first signal selector to couple a reference clock input to an output based on a first control signal provided by the first control signal input; a first mixer coupled to the first amplifier and to the frequency synthesizer, the first mixer to remove a carrier frequency at the receiver reference frequency from the amplified radio frequency signal; and a first filter coupled to the first mixer, the first filter to eliminate signals outside of a specified frequency range to produce an incoming baseband signal. - View Dependent Claims (15, 16, 17)
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18. A frequency synthesizer for use in a fast frequency hopping communications device, the frequency synthesizer comprising:
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a plurality of oscillators, each oscillator having a first input coupled to a reference clock frequency signal, the oscillator configured to produce a reference frequency that is a harmonic of a reference clock frequency of the reference clock frequency signal; and a signal selector having a control signal input and a plurality of reference clock inputs, each reference clock input coupled to an output from an oscillator in the plurality of oscillators, the signal selector to couple a reference clock input to an output based on a control signal provided by the control signal input, wherein the fast frequency hopping communications device communicates using several groups of frequency bands, with each group of frequency bands having a different reference clock frequency, wherein the plurality of oscillators is partitioned into several groups of oscillators, one group of oscillators per group of frequency bands, and wherein each group of oscillators is coupled to a different reference clock frequency signal.
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Specification