一、引言目前数字式频率合成器,已成为广泛应用的一种频率源。在数字式频率合成器中,数字式锁相环是基本的单元,而数字式可变分频器又是数字环中的一个重要功能部件。在可变分频器的设计中,较老的设备多采用“十读出法”和“九读出法”等方案。较新的设备大都采用“吞脉冲”方案。本文就是针对传统的吞脉冲方案之缺点,提出一种新的可变分频器方案。它保留了传统吞脉冲方案的 I. Introduction At present, digital frequency synthesizer has become a widely used frequency source. In the digital frequency synthesizer, the digital phase-locked loop is the basic unit, and digital variable divider is an important part of the digital ring. In the design of variable frequency divider, the older devices often use “ten read out” and “nine read out of law” and other programs. Most newer devices use the “swallow pulse” scheme. This article is aimed at the traditional shortcomings of swallowing pulse, proposed a new variable frequency divider scheme. It retains the traditional swallowing pulse scheme