METHODS, SYSTEMS, AND NON-TRANSITORY COMPUTER READABLE MEDIA FOR WIDEBAND FREQUENCY AND BANDWIDTH TUNABLE FILTERING
First Claim
1. A wideband frequency and bandwidth tunable filter, comprising:
- a first splitter for receiving a filter input signal and producing a first input signal and a second input signal;
a first modifier block for modifying the first input signal to produce a first output signal;
an adjustment circuit for modifying the second input signal to produce a second output signal having an intermediate frequency response;
a first signal combiner for combining the first output signal and the second output signal to produce a filter output signal; and
a compensation device for adjusting at least one of a phase of the first output signal relative to a phase of the second output signal and an amplitude of the first output signal relative to an amplitude of the second output signal such that the filter output signal has a desired frequency response,wherein the adjustment circuit comprises;
a second splitter for receiving the second input signal and producing a third input signal and a fourth input signal;
a second modifier block for modifying the third input signal to produce a third output signal;
a third modifier block for modifying the fourth input signal to produce a fourth output signal; and
a second signal combiner for combining the third output signal and the fourth output signal to produce the second output signal having the intermediate frequency response.
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Accused Products
Abstract
Methods, systems, and computer readable media for wideband frequency and bandwidth tunable filtering are disclosed. According to one aspect, the subject matter described herein includes a wideband frequency and bandwidth tunable filter that splits a filter input signal into first and second input signals, modifies the first input signal to produce a first output signal, modifies the second input signal to produce a second output signal having an intermediate frequency response, and combines the first and second output signals while adjusting their relative phases and/or amplitudes to produce a filter output signal with the target frequency response. Adjustment includes splitting the second input signal into third and fourth input signals, which are modified and then combined to produce the second output signal having the intermediate frequency response.
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Citations
70 Claims
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1. A wideband frequency and bandwidth tunable filter, comprising:
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a first splitter for receiving a filter input signal and producing a first input signal and a second input signal; a first modifier block for modifying the first input signal to produce a first output signal; an adjustment circuit for modifying the second input signal to produce a second output signal having an intermediate frequency response; a first signal combiner for combining the first output signal and the second output signal to produce a filter output signal; and a compensation device for adjusting at least one of a phase of the first output signal relative to a phase of the second output signal and an amplitude of the first output signal relative to an amplitude of the second output signal such that the filter output signal has a desired frequency response, wherein the adjustment circuit comprises; a second splitter for receiving the second input signal and producing a third input signal and a fourth input signal; a second modifier block for modifying the third input signal to produce a third output signal; a third modifier block for modifying the fourth input signal to produce a fourth output signal; and a second signal combiner for combining the third output signal and the fourth output signal to produce the second output signal having the intermediate frequency response. - View Dependent Claims (6, 7, 16, 17)
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21. A receiver with tunable filter, the receiver comprising:
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an interface for receiving at least one input signal; and a wideband frequency and bandwidth tunable filter for filtering the at least one input signal and producing a filtered output signal having a desired frequency response, the filter including a filter input node for receiving the at least one input signal from the interface, the filter comprising; a first signal path for receiving a first filter input signal from the filter input node and producing a first filter output signal; a second signal path for receiving a second filter input signal from the filter input node and producing a second filter output signal, the second signal path including an adjustment circuit for adjusting the frequency spectrum of the second filter input signal to produce the second filter output signal; a conditioning circuit for conditioning at least one of the first filter input signal and the second filter input signal to provide at least one conditioned input signal to the adjustment circuit; a compensation device for adjusting at least one of a phase of the first filter output signal relative to a phase of the second filter output signal and an amplitude of the first filter output signal relative to an amplitude of the second filter output signal; and a signal combiner for combining the first filter output signal with the second filter output signal to produce the filtered output signal having a desired frequency spectrum. - View Dependent Claims (27, 28, 29, 36, 37, 41, 47, 48, 52)
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55. A method for wideband frequency and bandwidth tunable filtering, the method comprising:
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receiving an input signal for which wideband frequency and bandwidth tunable filtering is desired; creating a second input signal having at least one of a desired phase, amplitude, and delay relative to the first input signal; modifying the second input signal to create a modified second input signal having a desired frequency spectrum, wherein creating the modified second input signal having the desired frequency spectrum includes creating a third input signal having at least one of a desired phase, amplitude, and delay relative to the second input signal, modifying the third input signal to produce a fourth input signal, and combining the second input signal and the fourth input signal to create the modified second input signal having the desired frequency spectrum; adjusting at least one of phase, delay, amplitude magnitude, amplitude sign, and frequency spectrum of the modified second input signal with respect to the first input signal; and combining the modified second input signal with the first input signal to create an output signal having the desired frequency response. - View Dependent Claims (56, 57, 58, 59, 60, 62, 63, 64, 65, 66, 67, 68, 69)
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70. A non-transitory computer readable medium having stored thereon executable instructions that when executed by the processor of a computer control the computer to perform steps comprising:
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receiving an input signal for which wideband frequency and bandwidth tunable filtering is desired; creating a second input signal having at least one of a desired phase, amplitude, and delay relative to the first input signal; modifying the second input signal to create a modified second input signal having a desired frequency spectrum, wherein creating the modified second input signal having the desired frequency spectrum includes creating a third input signal having at least one of a desired phase, amplitude, and delay relative to the second input signal, modifying the third input signal to produce a fourth input signal, and combining the second input signal and the fourth input signal to create the modified second input signal having the desired frequency spectrum; adjusting at least one of phase, delay, amplitude magnitude, amplitude sign, and frequency spectrum of the modified second input signal with respect to the first input signal; and combining the modified second input signal with the first input signal to create an output signal having the desired frequency response.
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Specification