Electronic devices having interferers aligned with receiver filters
First Claim
1. A method for reducing radio-frequency interference in an electronic device that has at least one radio-frequency receiver that receives radio-frequency antenna signals in a communications channel having a center frequency and that has at least one adjustable clock source that produces an interference signal at an interferer frequency, comprising:
- with control circuitry in the electronic device, adjusting the clock source in real time to align the interferer frequency with the center frequency.
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Accused Products
Abstract
Electronic devices contain radio-frequency receivers such as direct conversion receivers. A receiver may receive radio-frequency antenna signals from an antenna in an electronic device. The receiver may include notch filters that attenuate signals in the center of the communications channel that is being received by the receiver. An electronic device may include a clock source. The clock source may be used to clock electrical components in the electronic device. During operation, the clock source may produce radio-frequency interference signals at an associated interferer frequency. The potential for the interference signals to disrupt operation of the receiver can be reduced by configuring the electronic device so that the interferer frequency is aligned with the center of the communications channel. The clock source may be adjusted dynamically to accommodate changes in the communications channel.
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Citations
15 Claims
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1. A method for reducing radio-frequency interference in an electronic device that has at least one radio-frequency receiver that receives radio-frequency antenna signals in a communications channel having a center frequency and that has at least one adjustable clock source that produces an interference signal at an interferer frequency, comprising:
with control circuitry in the electronic device, adjusting the clock source in real time to align the interferer frequency with the center frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic device comprising:
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wireless communications circuitry that operates in at least one communications channel having a center frequency; at least one adjustable clock source that gives rise to an associated interference signal having an interferer frequency; and circuitry that dynamically adjusts the clock source until the interferer frequency equals the center frequency. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification