US Patent 11791786 Circuit and method to enhance efficiency of semiconductor device

A circuit includes an operational amplifier, a plurality of input capacitors, a plurality of output capacitors, a plurality of sampling switches, a plurality of holding switches, a plurality of combined switches. The input capacitors include a first input capacitor and a second input capacitor. The output capacitors include a first output capacitor and a second output capacitor. The sampling switches include a first sampling switch, a second sampling switch, a third sampling switch and a fourth sampling switch. The holding switches include a first holding switch and a second holding switch. The combined switches include a first combined switch and a second combined switch.