Design of external synchronous trigger multi-channel and single-cycle function generator

In order to solve the problem that general signal generator fails to generate single-cycle and non-standard waveform,the external synchronous trigger multi-channel and single-cycle funtion generator was designed.This design uses DDS (direct digital synthesis) thought and look-up table method,the phase digital value was output from microcontroller port,then output waveform can be obtained through DAC converter chip.This function generator can not only produce sine wave,triangle wave,square wave but also generate an arbitrary waveform.Decoder and A/D converter chip have been used to satisfy the needs of several multiple hydraulic proportional servo valve.At the same time,it's able to use an external trigger to control the load times.System testing results showed the function generator has good performance and easy to use,low cost.It has good prospects.