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本文介绍了变型小数分频的原理及工作过程与应用,将它应用于频率合成器,将大大提高频率合成器的性价比。近年来,随着集成电路的迅速发展,采用锁相环的频率合成器具有良好的性能价格比。特别是采用修改的锁相环——小数分频技术的合成器具有许多优点:1.结构简单 2.频率分辨率可以做得很高;可获得相位连续的扫描。如Hp公司的频率合成器3335中,一个锁相环,其频率分辨率达15个十进位。可见用一个单环电路就实现了多环电路的功能,大大简化了结构,提高了性价比。鉴于小数分频技术的独特优点,很有进行探讨的必要。
This article introduces the principle and working process of the fractional crossover and its application, and applies it to the frequency synthesizer, which will greatly improve the cost performance of the frequency synthesizer. In recent years, with the rapid development of integrated circuits, frequency synthesizers using PLLs have good cost performance. In particular, the use of a modified phase-locked loop - fractional crossover technology synthesizer has many advantages: 1. Simple structure 2. Frequency resolution can be done very high; available phase scanning. As Hp’s frequency synthesizer 3335, a phase-locked loop, the frequency resolution of 15 decimal places. Can be seen with a single loop circuit to achieve the function of multi-loop circuit, greatly simplifying the structure and improve the cost. In view of the unique advantages of fractional crossover, it is necessary to explore.