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本文的第一部份阐述了一种电路,可以通过分频和倍频的方法,从一个已知的基本频率导出所需的新频率。这部份描述分频电路,并介绍几种前置分频器,同时解释了如何使用它们来扩展分频电路的频率范围。目前,即使是高达1 GHz 的分频,几乎都是用数字二进制计数器作为基本电路的。另一种方法,如同步次谐波振荡器或调谐再生环,已被廉价的数字集成电路所取代。把 N 个二进制计数器单元简单级联,其分频比为2~N。但是,一般说来,频率合成器
The first part of this article describes a circuit that can derive the desired new frequency from a known fundamental frequency by dividing and multiplying the frequency. This section describes the frequency division circuit and introduces several types of prescaler and explains how to use them to extend the frequency range of the frequency division circuit. At present, almost all use digital binary counters as basic circuits, even at frequencies up to 1 GHz. Another method, such as a synchronous subharmonic oscillator or a tuned regenerative ring, has been replaced by cheap digital integrated circuits. The N binary counter unit simple cascade, the frequency ratio of 2 ~ N. However, in general, the frequency synthesizer