Importance

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Abstract

A passive switched-capacitor (PSC) filter includes (i) an array of capacitors that can store and share electrical charge and (ii) an array of switches that can couple the capacitors to a summing node. Each switch couples an associated capacitor to the summing node when enabled. Each capacitor stores a voltage value from the summing node when selected for charging and shares electrical charge with other capacitors via the summing node when selected for charge sharing. The PSC filter may include multiple sections for multiple filter taps. Each section includes one or more capacitors of equal size determined based on a corresponding filter coefficient. The capacitors in each section may be sequentially selected for charging with an input or output signal, one capacitor in each clock cycle. In each clock cycle, one capacitor in each section may be selected for charge sharing to generate the output signal.

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First Claim