Patent ID: 7961827
Filing Date: 2011-06-14
Classification: H03H,H03J

Abstract:
1. A signal processing arrangement comprising a filter for suppressing unwanted signals, the filter comprising a plurality of filter elements characterized in that the signal processing arrangement comprises: a switching circuit for switching a first filter element of the plurality of filter elements and, subsequently, a second filter element of the plurality of filter elements from a filter state to an adjustment state and back again to the filter state, the first and second filter elements that are in the filter state contributing to the suppressing of unwanted signals, the first and second filter elements that are in the adjustment state affecting a characteristic of a measurement signal; an adjustment circuit for adjusting the first and second filter elements that are in the adjustment state so that the characteristic of the measurement signal is substantially equal to a target value; and a signal source for applying a stimulus signal to the first and second filter elements that are in the adjustment state, the first and second filter elements providing the measurement signal in response to the stimulus signal, wherein the signal source is arranged to provide a DC stimulus signal and an AC stimulus signal so as to obtain a DC measurement signal and an AC measurement signal, respectively, wherein the adjustment circuit being arranged to adjust the first filter element which constitutes a resistor based on the DC measurement signal, and to adjust the second filter element which constitutes a capacitor based on the AC measurement signal.