Patent ID: 8198918

Claim:
An integrated circuit (IC) comprising: a functional circuit coupled between a power supply terminal and a ground terminal of the IC, the functional circuit to receive a power supply for operation on the power supply terminal, wherein the power supply is provided with a first voltage value for a first logic-level swing of an output signal of the functional circuit, wherein the power supply is provided with a second voltage value for a second logic-level swing of the output signal of the functional circuit, wherein the first voltage value is greater than the second voltage value, and wherein the first logic-level swing is greater than the second logic-level swing; and a capacitor cell coupled between the power supply terminal and the ground terminal, the capacitor cell comprising: a first capacitor and a second capacitor; and a plurality of switches operable to couple the first capacitor and the second capacitor in a series arrangement between the power supply terminal and the ground terminal when the output signal is to be provided with the first logic-level swing, the plurality of switches operable to couple the first capacitor and the second capacitor in a parallel arrangement between the power supply terminal and the ground terminal when the output signal is to be provided with the second logic-level swing.