Research on the Technology of Phase Difference Measurement Based on FPGA

The traditional design of signal phase difference measurement has some shortcomings of complicated hardware structure, bad capacity of resisting disturbance, etc. This problem especially become more prominent during the high frequency signal measurement. In order to eliminate the drawbacks above, this article mix the measured signal in high frequency with the standard DDS signal in low-frequency and pass a low-pass filter relatively easy measured low-frequency signal to get through low pass filter for transforming a low frequency signal that relatively easy to measure, based on MATLAB / Simulink system-level model of algorithms and the simulation tools named DSP Builder software. Through the DSP Builder to design the circuit model so as to generate the VHDL file and the Tcl (tool command language) script, making a comprehensive, hardware implementation and simulation in FPGA. The simulation results of MATLAB show that the design is simple, reliable and flexible.