Filter shaping using a signal cancellation function
First Claim
1. A filter comprising:
- first means for receiving a first signal; and
second means for employing one or more modified representations of the first signal to suppress one or more frequency components of the first signal, yielding an output signal in response thereto,wherein the first means includes a splitter adapted to receive the first signal and split the first signal onto a first path and a second path, andwherein the second means includes one or more delay modules and one or more phase shifters in the first path and/or the second path.
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Accused Products
Abstract
A signal filter and accompanying methods. In one embodiment, the filter includes a first mechanism for receiving a first signal. A second mechanism employs one or more modified representations of the first signal to cancel one or more frequency components of the first signal, yielding an output signal in response thereto. In a more specific embodiment, the first mechanism includes a splitter for receiving the first signal and splitting the first signal onto a first path and a second path. The second mechanism further includes one or more delay modules and one or more phase shifters in the first path and/or the second path. One or more controllable amplifiers are optionally included in the first path and/or the second path. The one or more delay modules, phase shifters, or amplifiers are responsive to one or more control signals from a controller. The controller is adapted to modify behavior of the second mechanism so that the filter is characterized by a desired frequency response.
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Citations
35 Claims
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1. A filter comprising:
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first means for receiving a first signal; and second means for employing one or more modified representations of the first signal to suppress one or more frequency components of the first signal, yielding an output signal in response thereto, wherein the first means includes a splitter adapted to receive the first signal and split the first signal onto a first path and a second path, and wherein the second means includes one or more delay modules and one or more phase shifters in the first path and/or the second path. - View Dependent Claims (2, 3, 4)
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5. A filter comprising:
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first means for receiving a first signal; and second means for employing one or more modified representations of the first signal to suppress one or more frequency components of the first signal, yielding an output signal in response thereto, wherein the filter implements a controllable notch filter, the controllable notch filter being controllable in part via one or more controllable Variable Gain Amplifiers (VGAs) included in the second means, the one or more controllable VGAs affecting alignment of a modified representation of the first signal relative to the first signal itself. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A filter comprising:
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a first circuit that is operative to receive a first signal and that comprises a splitter, the splitter operative to split the first signal onto a first path and a second path; and a second circuit employing one or more modified representations of the first signal to suppress one or more frequency components of the first signal, yielding an output signal in response thereto, wherein the second circuit comprises at least one delay module and at least one phase shifter in the first path and/or the second path. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A filter comprising:
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a first circuit that is operative to receive a first signal; and a second circuit that employs at least one modified representation of the first signal to suppress at least one frequency component of the first signal, yielding an output signal in response thereto, wherein the filter implements a controllable notch filter, the controllable notch filter being controllable at least in part by at least one controllable variable gain amplifier that is included in the second circuit and that affects alignment of a modified representation of the first signal relative to the first signal itself. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification