Method for Operating a Filter Device, Method for Filtering, Calibratable Differential Filter Device, Computer Program and Computer-Readable Medium

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This patent describes a method and device for operating a calibratable differential filter, where two signal branches—one for a basic signal and another for its inverted (complementary) signal—can have their filter frequencies set independently. By intentionally setting the filter frequency of one branch to be different from the other, the resolution in selecting intermediate filter frequencies is improved without increasing hardware complexity. This approach allows for more precise and flexible frequency filtering in differential signal processing applications, and can be implemented in hardware, software, or a combination of both.

Use CasesContent extracted from patent full text and abstract with AI.

• Precision analog and mixed-signal circuits requiring differential signal filtering, such as audio processing equipment, communication systems, and instrumentation.
• Indoor positioning systems and other sensor systems where analog differential signals need precise frequency filtering before digitization.
• Signal conditioning stages in analog-to-digital converters (ADCs) for industrial, medical, and automotive electronics.
• Flexible programmable filter modules in system-on-chip (SoC) and microchip designs for customizable frequency responses.
• Test and measurement equipment requiring finely adjustable, high-resolution filtering for differential input signals.

BenefitsContent extracted from patent full text and abstract with AI.

• Achieves higher frequency resolution without increasing the number of filter components, reducing hardware size and cost.
• Improved accuracy and flexibility in tuning filter frequencies for differential signals.
• Simplified design and reduced complexity, as finer frequency steps can be reached through digital control rather than additional physical elements.
• The method can be implemented via hardware, software (e.g., via a decoder or computer program), or both, allowing integration in various platforms.
• Enhanced noise rejection and signal integrity due to optimal tuning of differential filters, which is critical in high-precision or noisy environments.

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Inventors & Applicants

Patent Abstract

The present invention relates to a method for operating a differential filter device (1) which can be calibrated and which comprises: a first branch (2), in particular provided for a main signal; a second branch (3), in particular provided for a complementary signal which is inverted in comparison with a main signal; first calibration means (4) for setting at least one filter frequency of the first branch (2); and second calibration means (5) for setting at least one filter frequency of the second branch (3); in which method at least one filter frequency of the first branch (2) is set using the first calibration means (4) and/or at least one filter frequency of the second branch (3) is set using the second calibration means (5), the at least one filter frequency of the first branch (2) being different from the at least one filter frequency of the second branch (3).