PHASE-LOCKED LOOP AND PHASE-LOCKING METHOD

摘要

A phase-locked loop and a phase-locking method are provided to generate a bias voltage by using a self-biased voltage-current converter. A phase-locked loop includes a charge pump(120), a voltage-current converter(140), and a current controlled oscillator(150). The charge pump generates a pump current for regulating a control voltage based on a bias voltage and a phase difference detection signal. The self-biased voltage-current converter generates the bias voltage and converts the control voltage to the converter current. The current controlled oscillator generates an oscillator current based on the bias voltage and generates an output signal having a frequency corresponding to the oscillator current. The oscillator current is proportional to the converter current.