Calibration of anti-aliasing filter mismatch
AssigneeCirrus Logic, Inc.
InventorsArashk Norouzpourshirazi, John L. Melanson, Axel Thomsen
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Abstract
In accordance with embodiments of the present disclosure, a method may include, in a system comprising a differential filter comprising a plurality of impedance elements, applying a common-mode signal to the differential filter, measuring an output signal of the differential filter in response to the common-mode signal to determine an error due to impedance mismatch of the impedance elements, and tuning one or more of the plurality of impedance elements to minimize the error.
Claims16
A method comprising, in a system comprising a differential filter comprising a plurality of impedance elements:
- applying a common-mode signal to the differential filter;
- measuring an output signal of the differential filter in response to the common-mode signal to determine an error due to impedance mismatch of the impedance elements;
- and
- tuning one or more of the plurality of impedance elements to minimize the error.
A system comprising:
- a signal generator configured to apply a common-mode signal to a differential filter comprising a plurality of impedance elements;
- an error extractor configured to measure an output signal of the differential filter in response to the common-mode signal to determine an error due to impedance mismatch of the impedance elements;
- and
- a controller configured to tune one or more of the plurality of impedance elements to minimize the error.
Dependencies are inferred from the claim text.