Self-adaptive digital frequency tracker based on small-capacity CPLD/FPGA (Complex Programmable Logic Device/Field Programmable Gate Array)

The utility model discloses a self-adaptive digital frequency tracker based on a small-capacity CPLD/FPGA (Complex Programmable Logic Device/Field Programmable Gate Array). The self-adaptive digital frequency tracker comprises a digital phase discriminator module which is used for generating error signals of input frequency and feedback frequency; the digital loop filter module is used for correcting a loop phase and filtering signal noise; the digital oscillator module is used for generating fixed-frequency pulses and realizing frequency tracking; and the self-adaptive digital frequency division module is used for determining a frequency division coefficient according to the relationship between the center frequency and the system clock and carrying out frequency division on the output signal of the digital oscillator. The device is realized through a programmable logic device, the design flexibility is increased, the research and development period is shortened, the research and development cost is reduced,