小数分频在吞脉冲频率合成器中的实现

New Broken Number Frequency Division Theory Based on Swallowing Pulse PLL Frequency Synthesizer

结合ANYO公司的LC72130的具体电路,介绍了吞脉冲与小数分频的概念。并由此推导出了吞脉冲锁相频率合成器的输出频率Fo、双模前置分频器的输出频率FP和参考频率FR之间的关系式。应用此关系式提出了一种新的小数分频理论及实现电路框图,使单环锁相频率合成器的平均分频比变为小数,从而可以解决频率合成器中高鉴相频率和高分辨率之间的矛盾。

According to the theory of swallow pulse PLL frequency synthesizer and the reality circuit of the LC72130 chip of SANYO,the formula of the frequency of dual-modulus prescaler method in programmable divider,the output frequencey of swallow pulse PLL frequency synthesizer and refferrenced frequency are derived. So,a new broken number frequency division theory and a circuit diagram to realize the theory are proposed. It is a new technique with feature of making average frequency-radio of single phase--locked loop become decimal fraction. It has settled the contradiction between the high pulse detection frequency and the high frequency resolution of the single PLL frequency synthesizer.