Patent ID: 8179183

Claim:
A switched-capacitor circuit comprising: input, ground and output terminals; a first capacitor comprising first and second armatures; a second capacitor connected to the second armature of the first capacitor at a node; a first switch connecting the input terminal to the first armature of the first capacitor, wherein the first switch is responsive to a first signal at a switching frequency; a second switch connecting the ground terminal to the first armature of the first capacitor, wherein the second switch is responsive to a second signal at the switching frequency, the second signal being different from the first signal, and the first and second signals having non-overlapping phases; a third switch directly connecting the second armature of the first capacitor to the output terminal; a filtering circuit connecting said node to a virtual ground only during first phases of the first signal, these first phases being the phases of signal storage of said input in the first capacitor; and a fourth switch connecting the node to the second armature of the first capacitor, the first and fourth switches being controlled by the first signal and the second and third switches being controlled by the second signal, wherein the first and second signals are binary signals.