IC693MDL643
IC693MDL643
频率合成输出：
在每一个时钟周期，频率累加器以输入的频率字为步进进行自增累加；累加结果的高位送给相位累加器与相位字进行累加，可以理解为在这里加上相位偏置；相位累加器的输出作为波形查找表的地址从查找表中读出相应的数据后送给D/A转换器，后经过低通滤波器，后级放大等信号调理电路形成模拟量的波形输出。
FREQ_WORDS<=X"EEEEE";
PHASE_WORDS<="0000000000";
FreqAcc:PROCESS(CLK)
BEGIN
IF(CLK'EVENTANDCLK='1')THEN
IC693MDL643
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