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If we can state it in simple terms, let's do that. A phase locked loop (PLL) will lock on a signal and "hold" it if it can. The local oscillator, a voltage controlled oscillator (VCO), will be "tuned" to the signal and will "stay with it" to "optimize reception" of the signal. It will lock on that signal and change with it slightly as it changes. That's the value of a PLL: it can stay with a signal even if the frequency of the signal shifts slightly. But can the PLL "see" the signal? And what else might it see? A PLL is generally set up to look for a signal in a given range of frequencies. If you have a PLL tuner in your FM radio receiver (and who doesn't anymore?), when you tune up, say, 101.1 MHz on your dial, do you want the receiver looking for a signal on 101.1 MHz or right around there, or will you settle for a 101.3 MHz signal? See the problem? You want 101.1 MHz, and you don't want the darn machine to "slide" over to 101.3 MHz if there isn't a 101.1 MHz signal out there. Or, if it's a weak signal, you don't want to be dragged "off station" by your PLL. You just want your PLL to look where you tell it to look. Where do you tell it to look? In what is called a capture range. The capture range is the range of frequencies over which the PLL will grab and lock a signal.Apologies for taking so long to get to the point. Links? You got 'em. Look below.

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