Digital Signal Generator of Low Frequency with Phase Shift
Xuhu Ren · Yibiao jishu yu chuanganqi · 2004
Introduced the principle of digital phase shift signal generator.To realize double channles digital phase shift signal generator,the system uses AVRmega8515 with high speed crystal of 16.384 MHz and software of DDFS(Direct Digital Frequency Synthesis).Because of optimal algorithm,it can do double channel phase calculation 6.553 6×10~5 times per second,so as to realize frequency step of 20 Hz and signal output with frequency from 20 Hz to 20.48 kHz and phase shift from 0 to 360 degree.The system has simple hardware and high stability of frequency and phase.With the interface of LED display and setting buttons which can set frequency and phase differential,it's convenience to use.