Patent ID: 7911284
Filing Date: 2011-03-22
Classification: H03B

Abstract:
1. A voltage controlled oscillator circuit comprising: a variable current generator supplying an operation current based on a current setting signal; a voltage controlled oscillator comprising a resonance circuit including a variable capacitor and an inductor, and outputting an output signal having an amplitude based on a current generated by the variable current generator; and a first optimization circuit receiving the output signal, and generating and outputting the current setting signal to the variable current generator based on an amplitude change of the output signal corresponding to a change of the current generated by the variable current generator, wherein the first optimization circuit stores the amplitude change based on a first current set value change as a criterion, and when an amplitude change of the output signal corresponding to the change of current flowed by the variable current generator based on a second current set value change does not meet the criterion, an optimize operation is finished.