本文报导我们研制的一种单片微机控制的锁相环频率合成器。它以大规模集成芯片ＭＣ１４５１４６为中心，配以参考振荡器、环路滤波器、直流放大器、压控振荡器、双模前置分频器以及单片机频率控制系统。其输出频率达５６～６０ＭＨｚ步进可变；分辨率达２５ｋＨｚ。本文主要描述环路各部件的电路，介绍单片微机控制系统的硬件结构及软件的设计方法。 This article reports that we developed a single-chip computer-controlled PLL synthesizer. It is a large-scale integrated chip MC145146 as the center, together with the reference oscillator, loop filter, DC amplifier, voltage-controlled oscillator, dual-mode prescaler and SCM frequency control system. The output frequency of 56 ~ 60MHz step variable; resolution of 25kHz. This paper mainly describes the circuit of each part of the loop, introduces the hardware structure of single-chip microcomputer control system and the software design method.