频率合成器是现代通信与探测系统中的重要组成部分。构成现代频率合成器的基础是数字式锁相环。虽然国内已能见到一些专用的大规模集成锁相环,但由于其置频、换频及某些控制功能较适合于用微机或单片机来完成,即需要一定的硬件与软件支持,这对一般用户来说,频率合成器的整个设计就显得复杂化了。本文介绍一种用廉价易得的中规模集成电路构成的宽频带、高性能、低成本的数字式定频扫频频率合成器, Frequency synthesizers are an important part of modern communication and detection systems. The basis of a modern frequency synthesizer is a digital phase-locked loop. Although some proprietary large-scale integrated phase-locked loops can be seen in China, due to its frequency-setting, frequency conversion and some control functions are more suitable to be completed by a microcomputer or a single chip microcomputer, it needs some hardware and software support, For the average user, the entire design of the frequency synthesizer becomes complicated. This article introduces a wideband, high performance, low cost digital frequency swept frequency synthesizer made of mid-sized and cheap ICs,