Design of a signal generator for data_driven based modeling

Modeling of an industrial object based on data driven method needs signal generator as excitation source.This kind of system modeling requires signal source device being small in size,high precision,fast converting speed and flexible configuration.This paper provides a direct digital frequency synthesis(DDS)signal generator based on FPGA and ARM,which can generate sine wave,triangle wave and square wave.Both the frequency of wave and the duty ratio of square wave can be changed.The paper expounds the system structure of the signal generator makes a precise calculation on minimum frequency of waveform,at the same time,designs and calculates the way to change the duty ratio of square wave.Furthermore,it analyzes the filter circuit and has determined the value of resistance and capacitance in low_past filter by calculating.Finally,it has done the analyses on the effects of system implementation and achieved the design goals.