A circuit and method are provided. The method couples a first bias signal to a first internal node and a second internal node via a first resistor and a second resistor, respectively, couples a second bias signal to a third internal node and a fourth internal node via a third resistor and a fourth resistor, respectively. The method further couples the first internal node to the second internal node via a switch of a first type controlled by a first control signal, couples the third internal node to the fourth internal node via a switch of a second type controlled by a second control signal, wherein the second control signal is an inversion of the first control signal, couples a first terminal to the first internal node and the third internal node via a first capacitor and a third capacitor, respectively; and couples a second terminal to the second internal node and the fourth internal node via a second capacitor and a fourth capacitor, respectively.