Switched capacitor circuits and charge transfer methods include a sampling phase and a transfer phase. Circuits and methods are implemented via a plurality of switches, a set of at least two capacitors, at least one buffer amplifier, and an operational amplifier. In one example, during the sampling phase at least one input voltage is sampled, and during the transfer phase at least a first reference voltage provided by the at least one buffer amplifier is subtracted from the at least one input voltage using the operational amplifier. The same set of at least two capacitors may be used in both the sampling phase and the transfer phase.