Spectrum spreaders including tunable filters and related devices and methods
First Claim
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1. A communications device comprising:
- a clock signal generator configured to generate a clock signal having a clock frequency;
a receiver coupled to the clock signal generator wherein the receiver is configured to receive communications over an air interface using the clock signal;
a spectrum spreader coupled to the clock signal generator wherein the spectrum spreader is configured to generate a spread spectrum clock signal responsive to the clock signal wherein a frequency of the spread spectrum clock signal is spread relative to the clock frequency; and
a processor coupled to the receiver and to the spectrum spreader wherein the processor is configured to operate at the frequency of the spread spectrum clock signal and to process the communications received at the receiver.
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Abstract
A spectrum spreader may include a signal conductor and a tunable filter. The signal conductor may be configured to receive a clock signal having a clock signal frequency. The tunable filter may be coupled to the signal conductor wherein the tunable filter is configured to spread a frequency of the clock signal responsive to a control signal to provide a spread spectrum clock signal. More particularly, a frequency of the spread spectrum clock signal may be spread relative to the clock frequency. Related communications devices and methods are also discussed.
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Citations
21 Claims
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1. A communications device comprising:
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a clock signal generator configured to generate a clock signal having a clock frequency; a receiver coupled to the clock signal generator wherein the receiver is configured to receive communications over an air interface using the clock signal; a spectrum spreader coupled to the clock signal generator wherein the spectrum spreader is configured to generate a spread spectrum clock signal responsive to the clock signal wherein a frequency of the spread spectrum clock signal is spread relative to the clock frequency; and a processor coupled to the receiver and to the spectrum spreader wherein the processor is configured to operate at the frequency of the spread spectrum clock signal and to process the communications received at the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A spectrum spreader comprising:
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a signal conductor configured to receive a clock signal having a clock signal frequency; and a tunable filter coupled to the signal conductor wherein the tunable filter is configured to spread a frequency of the clock signal responsive to a control signal to provide a spread spectrum clock signal wherein a frequency of the spread spectrum clock signal is spread relative to the clock frequency wherein the tunable filter comprises an inductor-capacitor (LC) band pass filter.
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10. A spectrum spreader comprising:
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a signal conductor configured to receive a clock signal having a clock signal frequency; and a tunable filter coupled to the signal conductor wherein the tunable filter is configured to spread a frequency of the clock signal responsive to a control signal to provide a spread spectrum clock signal wherein a frequency of the spread spectrum clock signal is spread relative to the clock frequency wherein the tunable filter comprises an inductive circuit and a capacitive circuit coupled in parallel between the signal conductor and a reference voltage. - View Dependent Claims (11, 12, 13)
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14. A method of operating an electronic device, the method comprising:
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receiving a clock signal having a clock signal frequency; and spreading a frequency of the clock signal responsive to a control signal to provide a spread spectrum clock signal wherein a frequency of the spread spectrum clock signal is spread relative to the clock frequency; wherein receiving the clock signal comprises receiving the clock signal on a signal conductor and wherein spreading the frequency of the clock signal comprises filtering the clock signal using an inductor-capacitor (LC) band pass filter coupled to the signal conductor. - View Dependent Claims (15, 16, 17, 18)
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19. A method of operating an electronic device, the method comprising:
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receiving a clock signal having a clock signal frequency; spreading a frequency of the clock signal responsive to a control signal to provide a spread spectrum clock signal wherein a frequency of the spread spectrum clock signal is spread relative to the clock frequency; receiving communications over an air interface; and processing the communications received over the air interface using the spread spectrum clock signal. - View Dependent Claims (20, 21)
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Specification