Embodiments of the present disclosure provide a circuit structure including: a switching transistor including a gate terminal, a back-gate terminal, a source terminal, and a drain terminal; a biasing node coupled to the back-gate terminal of the switching transistor, the biasing node being alternately selectable between an on state and an off state; a first capacitor source-coupled to the switching transistor; a second capacitor drain-coupled to the switching capacitor; and a first enabling node source-coupled to the switching transistor, the first enabling node being alternately selectable between an on state and an off state.