Patent ID: 7609121

Claim:
A method for operating a voltage controlled oscillator, said method comprising: providing a voltage controlled oscillator comprising an inductor-capacitor (LC) tank circuit adapted to receive a first voltage and at least one varactor connected in parallel with said inductor-capacitor (LC) tank circuit and adapted to receive a second voltage, wherein said voltage controlled oscillator is further adapted to output a periodic signal a having a frequency that is a function of said first voltage and said second voltage; determining if said frequency is within a predetermined frequency range; and if said frequency is outside said predetermined frequency range, selectively programming resistance in a variable resistance e-fuse electrically connected to said at least one varactor so as to selectively adjust said second voltage at said at least one varactor, so as to selectively adjust capacitance of said at least one varactor, and further so as to bring said frequency to within said predetermined frequency range.