Systems and methods for calibrating a dual port phase locked loop

The present disclosure provides for a phase-locked loop (PLL) that includes a high-port calibration control module configured to calibrate an input modulation value of a voltage-controlled oscillator (VCO) to a first modulation value that results in an output signal of the VCO having a positive frequency change from an initial output frequency, and capture a positive frequency value of the output signal after a first accumulation time period. The high-port calibration control module is also configured to calibrate the input modulation value of the VCO to a second modulation value that results in the output signal having a negative frequency change from the initial output frequency, capture a negative frequency value of the output signal after a second accumulation time period, and calculate a calibration scale factor based on a difference between the positive and negative frequency values.