直接数字合成-英文资料.rar

Function generators have been around for a long while. Over time, these instruments have accumulated a long list of features. Starting with just a few knobs for setting the
amplitude and frequency of a sinusoidal output, function generators now provide wider frequency ranges, calibrated output levels, a variety of waveforms, modulation modes, computer interfaces, and in some cases, arbitrary functions.

函数发生器已流传了好长时间。随着时间的流逝,这些仪器已经累积了各种各样不同的特征。开始只有少量旋钮用来设置正弦波幅值和频率的输出，现在的功能已有所增加，例如频率范围较宽，校准输出水平，校正产出水平,多种波形、调制模式,计算机接口,在某些情况下,任意函数。