摘要
直接数字合成(DDS)是一种重要的频率合成技术,具有分辨率高、频率变换快等优点,在雷达及通信等领域有着广泛的应用前景。系统采用AD9850 (DDS)与AT89S52单片机相结合的方法,以AD9850为频率合成器,以单片机为进程控制和任务调度的核心,设计了一个信号发生器。实现了输出频率在10Hz～1MHz范围可调,输出信号频率稳定度优于10-3的正弦波、方波和三角波信号。正弦波信号的电压峰峰值Vopp能在0～5V范围内步进调节,步进间隔达到0.1V,所有输出信号无明显失真,且带负载能力强。
direct digital synthesis （DDS） is an important frequency synthesizer technology. With the advantages of high resolution and rapid transformation frequency etc, they are widely used on radar, communications and other fields. This system adopts the methods which combines AD9850（DDS） and AT89S52 microcomputer, with AD8950 as the frequency synthesizer, and with task scheduling and process control of the MCU, as the core. It designs a signal generator, Achieving the output frequency of 10 Hz to 1 MHz range adjustable. Output signal frequency stability of it is better than 10-3 the sine wave, square wave and triangular wave signal. The sine wave signal peak voltage peak Vopp can adjust from 0 to 5 V of the stepping conditioning ,with step interval 0.1V. the output signals have no obvious distortion. With a good ability to load belt.
出处
《电子技术（上海）》
2007年第11期24-25,共2页
Electronic Technology
