The circuit of making waveform was made up microprocessor system and three table look-up circuit,which getting waveform data from EEPROM continually and producing cyclic waveform by DAC and LPF.

• 波形的产生电路是由单片机系统和三相查表电路组成，它们不断地从EEPROM中取出波形点阵的数据，通过DAC和LPF电路输出周期波形。