DDS芯片中主要包括频率控制寄存器、高速相位累加器和正弦计算器三个部分（如Q2220）。频率控制寄存器可以串行或并行的方式装载并寄存用户输入的频率控制码；而相位累加器根据

dds

频率控制码在每个时钟周期内进行相位累加，得到一个相位值；正弦计算器则对该相位值计算数字化正弦波幅度（芯片一般通过查表得到）。DDS芯片输出的一般是数字化的正弦波，因此还需经过高速D/A转换器和低通滤波器才能得到一个可用的模拟频率信号。-The chips mainly includes DDS frequency control registers, high-speed phase accumulators and sine calculator 3 parts (such as Q2220). Frequency control register can serial or parallel way loaded and hosting the user input frequency control code　And according to the phase accumulators

DDS

Frequency control code in each clock cycle in accumulation phase, get a phase value　In this phase is sine calculator digital sine wave amplitude values calculated (chip general through the look-up table get). The general is DDS chip output digital sine wave, and so is required to pass through the D/A converter and low pass filter to get one of the available simulation frequency signal.