Output frequency calibration method and output frequency calibration system

The invention provides an output frequency calibration method which is applied to an FPGA and comprises the following steps: calculating the real frequency of an oscillator; reading configuration parameters of a phase-locked loop by taking the real frequency of the oscillator as an index, and pre-storing the configuration parameters and the corresponding output frequency; configuring the phase-locked loop according to the configuration parameters, and therefore the phase-locked loop outputs a corresponding output frequency, i.e., a frequency needing to be output after the oscillator is calibrated. According to the output frequency calibration method, through dynamic configuration of the phase-locked loop, the preset frequency is output to replace the frequency required to be output by theoscillator, so that the frequency required to be output by the OSC can be obtained in the FPGA, and the calibration efficiency is improved. The invention also provides an output frequency calibrationsystem for realizing the o