A phase-locked loop device may include the following elements: a phase frequency detector configured to generate a control signal; a charge pump connected to the phase frequency detector; a loop filter connected to the charge pump and configured to generate a control voltage based on a first current received from the charge pump, wherein the charge pump is configured to generate a second current based on the control signal and a first copy of the control voltage and to provide the second current to the loop filter, the second current being linearly related to the control voltage; a voltage-controlled oscillator connected to the loop filter and configured to generate an output signal based on a second copy of the control voltage, wherein a frequency of the output signal is directly proportional to the control voltage; and a signal processor connected between the voltage-controlled oscillator and the phase frequency detector.