Method, system and apparatus for wideband signal processing
AssigneeNewlans, Inc.
InventorsDivi Gupta, Dev V. Gupta
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Abstract
Embodiments include methods, systems, and apparatuses capable of dynamically and adaptively operating on wideband signals. Examples include state variable filters whose center frequencies can be tuned using variable gain blocks coupled to outputs of filter integrators. First- and second-order state variable filters may operate on signals in parallel and their outputs combined to produce a filtered output. Filters may be tuned to pass or reject signals depending on the application; sample applications include, but are not limited to: agile filtering; spectrum analysis; interference detection and rejection; equalization; direct intermediate-frequency transmission; and single-sideband modulation and demodulation.
Claims31
A wideband signal processing apparatus comprising:
- an mth-order state variable filter and an nth-order state variable filter configured to operate on a wideband input in parallel, where m and n are positive integers;
- and
- a summer configured to add outputs from the mth- and nth-order state variable filters to produce a processed output;
- an analog-to-digital converter configured to produce a digital representation of the processed output;
- and
- a digital signal processor configured to control the mth- and nth-order state variable filters based on the digital representation of the processed output;
- wherein the digital signal processor is further configured to control center frequencies and transfer functions of the mth- and nth-order state variable filters by changing tap weights of the mth- and nth-order state variable filters or a DC voltage;
- where m and n are positive integers.
A state variable filter comprising:
- a residue block configured to provide a residue of a wideband input;
- a summer configured to combine a pole of a filtered output and the residue of the wideband input;
- an integrator configured to integrate an output of the summer;
- and
- a variable gain block configured to amplify an output of the integrator to provide the filtered output;
- and
- a pole block configured to provide the pole of the filtered output;
- wherein the residue block, variable gain block, and pole block are configured to be controlled to compensate for non-idealities of the integrator.
A state variable filter comprising:
- a summer configured to combine at least one fractional gain with a wideband input;
- a first integrator configured to integrate an output of the summer;
- a first variable gain block configured to amplify an output of the first integrator to provide a first amplified signal;
- a second integrator configured to integrate a signal corresponding to the first amplified signal;
- a second variable gain block configured to amplify an output of the second integrator to provide a second amplified signal;
- and
- at least one fractional gain block configured to provide the at least one fractional gain factor based on the second amplified signal;
- wherein the fractional gain block, first variable gain block, and second variable gain block are configured to be controlled to compensate for non-idealities of the integrator.
A method of filtering wideband signals comprising:
- combining a pole of a filtered signal with a wideband input to provide a combined signal;
- integrating the combined signal to provide an integrated signal;
- and
- amplifying, by a variable gain block, the integrated signal by a gain G to provide the filtered signal, a filter center frequency scaled by the gain G;
- scaling the filtered signal by a first tap weight to provide a first scaled signal;
- coupling an unscaled version of the filtered signal to an input of another filter to provide another filtered signal;
- scaling the another filtered signal by a second tap weight to provide a second scaled signal;
- and
- combining the first and second scaled signals.
Dependencies are inferred from the claim text.