Patent ID: 8890548

Claim:
A compensating circuit, comprising: a pair of first leads for linking to an AC circuit; a variable capacitor, electrically linked to the first leads, for providing different capacitance value according to a programmable capacitance array; and a control unit, electrically linked to the first leads, for changing the capacitance value of the variable capacitor as one capacitance of the programmable capacitance array according to an external instruction, wherein the programmable capacitance array provides different capacitance values equaling to ∑ n = 0 m ⁢ ACC ⁡ [ n ] × 2 n × ( Cap ) , wherein the ACC[n] is a BIT array, comprising a number of 0 and 1, the m is a parameter, the n is a recursive parameter, the Cap is a unit capacitance, and a unit of the capacitance value is pico-farad (pF).