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mai chong zhong fu pin lv jian bie qi
Author(s): 
Pages: 27-28
Year: Issue:  0
Journal: Beijing Electronics Information Time Guiding

Keyword:  鉴别器脉冲重复频率输入脉冲D触发器鉴别电路鉴别并D型触发器单稳态触发器实用电路述要;
Abstract: <正> 在许多场合下,需要采用硬件电路对脉冲序列(例如时钟脉冲)的重复频率进行鉴别并产生相应的控制信号。具体要求是:当输入脉冲重复频率fc高于阈值频率f0时,输出为高电平;反之,则输出为低电平(或作相反的规定)。 利用单稳态触发器和D触发器可设计出满足上述要求的简单、实用的鉴别电路,其原理及波形如图1和图2所示。
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