VGA(Video Graphics Array)是IBM在1987年随PS／2机一起推出的一种视频传输标准，具有分辨率高、显示速率快、颜色丰富等优点，在彩色显示器领域得到了广泛的应用。-VGA,Is IBM in 1987 with the PS/2 machines with the launch of a video transmission standard, high resolution, fast display rate, the advantages of rich color

用DSM调制1-bit输出，经简单模拟滤波电路，产生VGA控制电压。对于内部频率高、但VGA变化速度较慢的场合，可以达到很高的控制精度，从而省却了内部高精度DAC的模块-DSM modulation with 1-bit output, through a simple analog filter circuit, producing VGA control voltage. in the circumstance of high internal frequency, but need a s