本文讨论了UHF数字集成锁相环频率合成器。该合成器不同于过去的变频锁相环,它的VCO和前置分频器都工作在UHF频率上,鉴相频率高(等于频道间隔)。文中着重讨论了环路噪声,并介绍了在移动通信机中该合成器的实际使用方法。 This article discusses the UHF digital integrated phase-locked loop frequency synthesizer. The synthesizer is different from the previous frequency-variable phase-locked loop, its VCO and prescaler work on the UHF frequency, the phase frequency is high (equal to the channel spacing). This paper focuses on the loop noise, and introduces the practical use of the synthesizer in mobile communication.