A High Precision Digital Frequency Synthesizer Amended by GNSS 1PPS Signal
XU Yong-bing · Radio Engineering · 2011
This paper describes a high precision digital frequency synthesis manner,using the 1PPS signal of GNSS module to quickly amend the control word of DDS logic module which realized in FPGA chips,then transferring digital signal to analog signal by reverse π type resistor network.The experiment data shows that this method can generate a high precision frequency regardless of the excursion of crystal oscillator,furthermore using FPGA can generate multiplex frequency flexibly and cheaply.