采用Altera的NIOS内核，配合独立的累加器，实现了正弦波，三角波，锯齿波和方波的DDS产生电路，系统时钟最高可达120MHz，配合高速DAC，可产生最高约40MHz左右的波形-Using Altera' s NIOS core, with a separate accumulator, to achieve a sine wave, triangle wave, sawtooth and square wave genera