当光场的微观客体发射一个光子时，总是有一个发射延迟时间，在这个时间内发射的光子的频率不是绝对的定值，这个光子的频率范围就是频率宽度。
在分频多任务（用于模拟讯号），信道切割成次信道，每个信道具有不同的频率宽度，指定给特定的讯号。
In FDM (typically used for analog signals) the channel is subdivided into subchannels, each with a different frequency width that is assigned to a specific signal.
前面板控制允许用户设置脉冲宽度与频率或先设置频率与占空因数，再设置脉冲宽度。
The front panel controls allow the user to set pulse width and frequency independently, or to set frequency and duty cycle, which then sets the pulse width accordingly.
因此，需要提供具有可控制最小脉冲宽度的相位频率检测器。
Therefore, it would be desirable to provide a phase frequency detector that has a controllable minimum pulse width.
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