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, 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.
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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
20 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, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. 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, the oscillator to produce a reference frequency that is a harmonic of a reference clock frequency of a reference clock frequency signal provided by the reference clock frequency signal input, and a first multiplexer 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 multiplexer 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 (17, 18)
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19. A digitally controlled frequency synthesizer for use in a fast frequency hopping communications device, the digitally controlled frequency synthesizer comprising:
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a digitally controlled capacitor array to provide a capacitive load dependent on a control word; and an LC oscillator coupled to the digitally controlled capacitor array and to a reference signal input, the LC oscillator to produce a signal at about an integer multiple of the reference frequency that is a function of the capacitive load provided by the digitally controlled capacitor array. - View Dependent Claims (20)
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Specification