Switched-capacitor recharging devices for VIS filters using fully differential operational amplifiers

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Abstract
A basic switched-capacitor recharging device is presented useful in voltage-inverter-switch filter implementations. A differential operational amplifier is used: there follows a simplified timing scheme, while insensitivities to parasitic capacitances can be ensured. An example of a fully differential third-order lowpass filter is given with numerical analysis of the possible mismatches in the values of the capacitors of the two signal paths.

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