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1. 发明授权

US5905410A Lock/unlock indicator for PLL circuits 失效
标题翻译： PLL电路的锁定/解锁指示灯
公开(公告)号：US5905410A
公开(公告)日：1999-05-18
申请号：US12167
申请日：1998-01-22
申请人： Glenn Edward Holmes , Timothy Gerard McNamara , Paul David Muench
发明人： Glenn Edward Holmes , Timothy Gerard McNamara , Paul David Muench
IPC分类号： H03L7/089 , H03L7/095
CPC分类号： H03L7/095 , H03L7/089 , Y10S331/02
摘要： A lock circuit for indicating a locked/unlocked condition of phased lock loops circuits, which uses a reference clock signal input to a good-cycle counter and to a bad-cycle counter to signal a set/reset latch to output a signal indicating whether or not the phase of the output signal and input clock are in phase. Phase detector inputs are XOR gated to produce a pulse when the phase locked output clock is in a bad cycle indicated by the phase locked output clock not being in-phase with its input clock. Pulses on the XOR gate output on a bad cycle feed a single cycle counter reset circuit. The single cycle counter reset circuit on every cycle resets one of the bad and good counters based on its detection of a bad cycle pulse from the XOR gate. The good-cycle counter's output is to the SET input of the set/reset latch, and the bad-cycle counter's output is to the RESET input of the set/reset latch . We enable specific cycling of both the good and bad counters.
摘要翻译：用于指示锁相环路电路的锁定/解锁状态的锁定电路，其使用输入到良周期计数器的参考时钟信号和坏周期计数器来发信号通知设置/复位锁存器，以输出指示是否或输出信号和输入时钟的相位不同相。当锁相输出时钟处于由锁相输出时钟与其输入时钟不同相指示的不良周期时，相位检测器输入为异或门控以产生脉冲。异或门输出的脉冲在一个坏的周期内输入单周期计数器复位电路。每个周期的单周期计数器复位电路都会根据检测到异或门坏的周期脉冲来重置坏计数器和好的计数器之一。好周期计数器的输出是设置/复位锁存器的SET输入，坏周期计数器的输出是设置/复位锁存器的RESET输入。我们启用了好的和坏的计数器的特定循环。

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