Patent ID: 7512390

Claim:
A phase-locked loop circuit, comprising: a detector; a charge pump coupled to the detector; a low-pass filter coupled to the charge pump to generate a first control signal; a controller to generate a second control signal based on a reference value; a first tuner which generates a first tuning signal based on the first control signal; a second tuner which generates a second tuning signal based on the second control signal; and a voltage-controlled oscillator which generates a frequency signal based on the first and second tuning signals, wherein first and second tuning signals tune the frequency signal by different amounts, and wherein the voltage-controlled oscillator includes a multivibrator having: a first circuit including a first node; a second circuit including a second node and being coupled to the first circuit; and an inductor coupled between the first and second nodes, wherein the first and second tuning signals charge and discharge the inductor to tune the frequency signal, which is output from one of the first and second nodes.