Patent ID: 9214912
Filing Date: 2015-12-15
Classification: H03F,H03G,H03M

Abstract:
1. A switched capacitor circuit operable in a sampling phase and a transfer phase, the switched capacitor circuit comprising: a plurality of switches; at least one input capacitor; an integration capacitor; at least one buffer amplifier; and an operational amplifier, wherein: during the sampling phase, the plurality of switches are configured to couple a first input voltage to the at least one input capacitor and a second input voltage to the integration capacitor; and during the transfer phase, the plurality of switches are configured to couple the at least one input capacitor, the integration capacitor, and the at least one buffer amplifier to the operational amplifier to subtract at least a first reference voltage from a sum voltage based on the first input voltage and the second input voltage so as to provide an output voltage from the operational amplifier, wherein an input of the at least one buffer amplifier is electrically coupled to an input terminal of the operational amplifier during the transfer phase.