Analog FIR filters by switched-capacitor techniques

The implementation of general-purpose FIR (far infrared) filters by stray-insensitive SC (switched capacitor) techniques is addressed. First, a simple building block for an analog tapped delay line is introduced. The proposed cell comprises a single amplifier and is controlled by a multiphase clocking scheme. Then, it is shown how this circuit can be developed into a generic FIR filter cell without the need for additional amplifiers. The feasibility of the new building blocks is demonstrated by the example of a linear-phase low-pass filter design.<
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