Phase locked loop and phase locking method

A method of locking a phase of an output signal, comprising:

• generating a pump current for adjusting a control voltage based on a bias voltage and a phase difference detection signal;
• converting the control voltage to a converter current by generating the bias voltage using self-biasing;
• generating an oscillator current based on the bias voltage;
• and
• generating the output signal with a frequency corresponding to the oscillator current.

A method of locking a phase of an output signal, comprising:

• generating a pump current based on a bias voltage and a phase difference detection signal, the pump current configured for adjusting a control voltage;
• converting the control voltage to a converter current by generating the bias voltage using self-biasing;
• generating an oscillator current based on the bias voltage;
• and
• generating the output signal with a frequency corresponding to the oscillator current,
• wherein the pump current, the oscillator current, and the converter current are proportional to each other and the bias voltage includes a first bias voltage and a second bias voltage, and generating the pump current includes:
• generating a first pump current based on the first bias voltage;
• generating a second pump current based on the second bias voltage;
• and
• selecting one of the first pump current and the second pump current based on the phase difference detection signal.