Patent ID: 7860477
Filing Date: 2010-12-28
Classification: H03H

Abstract:
1. A filter circuit, comprising: a primary filtering portion having at least one passive element and being configured to receive an input and to provide a filtered output; a calibrating feedback portion coupled to receive the filtered output and to provide a feedback to the primary filtering portion, the calibrating feedback portion includes at least one amplifier element coupled to receive the filtered output, a resistive element coupled in series with the at least one amplifier element, a capacitive element coupled in parallel with the resistive element, and an adjustable portion coupled in parallel with the capacitive element; and another adjustable portion having at least one controllable segment coupled in parallel with the at least one passive element of the primary filtering portion, the controllable segment being adjustable based on the feedback from the calibrating feedback portion to provide an adjusted filtered output from the primary filtering portion.