Patent ID: 8237243
Filing Date: 2012-08-07
Classification: G06F,H01G,H01L

Abstract:
1. An on-chip capacitor having a variable capacitance, the on-chip capacitor comprising: first and second ports configured to be powered with opposite polarities; first and second electrodes; and first and second voltage-controlled units each configured to be switched between a first state in which the first and second electrodes are electrically isolated from the first and second ports and a second state, the first electrode electrically connected with the first port when the first voltage-controlled unit is switched to the second state and the second electrode electrically connected with the second port when the second voltage-controlled unit is switched to the second state, wherein the on-chip capacitor has a larger capacitance value when the first and second voltage-controlled units are in the second state than when the first and second voltage-controlled units are in the first state.