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发明授权
CN101350620B 数字相位鉴别器 有权

数字相位鉴别器
摘要：
本发明涉及一种用于锁相回路中的相位鉴别器电路，该数字相位鉴别电路可程序设定参考信号及目标信号间的相位差，由此判断是否达到两信号相位差，进而对PLL频宽的控制，该电路包括接收一参考信号的可程序化相位差距选择器；一第一相位数字转换器，转换来自可程序化相位差距选择器的一输出信号为一第一数字程序代码；一第二相位数字转换器，转换一目标信号与此参考信号间的一相位差为一第二数字程序代码；以及一程序代码比较器，比较第一及第二数字程序代码，并根据第一及第二数字程序代码数值顺序的一改变，产生一第一指令信号进而控制。
摘要（英）：

A phase discriminator for being used in a phase-locked loop to determine if a phase difference between a reference signal and a target signal has reached a programmable gap value is disclosed which comprises a programmable phase gap selector receiving the reference signal, a first phase digital converter converting an output signal from the programmable phase gap selector to a first digital code,a second phase digital converter converting a phase difference between the target signal and the reference signal to a second digital code, and a code comparator comparing the first and second digital code and generating a first instructional signal based on a change of order of the values of the first and second digital code.

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