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本发明的背景本发明论及频率合成器,特别论及具有搜索和确定频率功能的频率合成器(SCFS),这种合成器含有两个频谱发生器和一个锁相环。本专利以前,这方面的技术状况在 Boelke 的专利(U.S.P.3694766)中已有详细报导。Boelke 揭示了一种只有一个晶体振荡器的频率合成器,振荡器耦合到一对分频器,它们各产生一个信号频率,并馈送到谐波发生器。在频率合成器中使用分频器电路,存在着许多固有的缺点。分频器费用高,复杂,
BACKGROUND OF THE INVENTION The present invention relates to frequency synthesizers, and more particularly to frequency synthesizers (SCFS) with the ability to search and determine frequencies, which synthesizer contains two spectrum generators and a phase locked loop. Prior to this patent, the state of the art in this respect is covered in detail in Boelke's patent (U.S. Patent No. 3,694,766). Boelke reveals a frequency synthesizer with only one crystal oscillator. The oscillator is coupled to a pair of dividers, each of which generates a signal frequency and is fed to a harmonic generator. There are many inherent disadvantages of using divider circuits in frequency synthesizers. Divider high cost, complex,