Patent ID: 7944315

Claim:
A programmable voltage-controlled oscillator having an output frequency, the programmable voltage-controlled oscillator comprising: a control unit for providing a programmable code; a current selector, electrically connected to the control unit, for generating a selected current according to the programmable code; a current mirror unit, electrically connected to the current selector, for generating a first mirroring current and a second mirroring current according to the selected current; an oscillator module, electrically connected to the current mirror unit, for oscillating according to the first mirroring current and the second mirroring current; and a one-time-programming component, electrically connected to the control unit and the current selector respectively, after the programmable code being tuned to make the output frequency approach a predetermined frequency, the control unit burning the tuned programmable code into the one-time-programming component; wherein the current selector comprises a constant voltage source for generating a first constant voltage; a current generator, electrically connected to the constant voltage source and the current mirror unit respectively; and a series resister, electrically connected to the current generator, the control unit and the one-time-programming component respectively, for generating a selected resister value according to the programmable code; wherein the current generator generates the selected current according to the first constant voltage and the selected resister value, and the programmable voltage-controlled oscillator controls the output frequency according to the tuned programmable code burned in the one-time-programming component.