阅读说明：本技术 用于确定两频率之间比值的电路和方法 (Circuit and method for determining the ratio between two frequencies ) 是由 迈克尔·范·埃尔扎克 罗伯·范·德瓦尔克 基斯·范·纽堡 于 2020-02-24 设计创作，主要内容包括：确定两频率之间比值可能为功能非常多样化的不同电子电路中有用的一电子构建区块。本发明包含一种用于确定具有一第一频率的一第一输入信号与具有一第二频率的一第二输入信号之间一频率比值的电路,其中该电路包含：一可控分数频率分频器,其经配置用于产生具有一分频频率的一分频信号,该分频频率实质上为该第一频率除以一控制信号；一频率相位侦测器,其经配置用于基于该分频信号的该分频频率与该第二输入信号的该第二频率之间的一频率相位差来产生一相位差信号；及一回路滤波器,其经配置用于基于该相位差信号产生该控制信号；其中一回路由该可控分数频率分频器、该分频信号、该频率相位侦测器、该相位差信号、该回路滤波器和该控制信号形成；其中该回路滤波器对该相位差信号进行滤波,使得防止该回路的不稳定性；且其中该控制信号,较佳地为该控制信号的量值,指示该频率比值。(Determining the ratio between two frequencies may be a useful electronic building block in different electronic circuits with a very diverse functionality. The present invention comprises a circuit for determining a frequency ratio between a first input signal having a first frequency and a second input signal having a second frequency, wherein the circuit comprises: a controllable fractional frequency divider configured to generate a divided signal having a divided frequency that is substantially the first frequency divided by a control signal; a frequency-phase detector configured to generate a phase difference signal based on a frequency phase difference between the divided frequency of the divided signal and the second frequency of the second input signal; and a loop filter configured to generate the control signal based on the phase difference signal; wherein a loop is formed by the controllable fractional frequency divider, the divided signal, the frequency phase detector, the phase difference signal, the loop filter, and the control signal; wherein the loop filter filters the phase difference signal such that instability of the loop is prevented; and wherein the control signal, preferably the magnitude of the control signal, is indicative of the frequency ratio.)