An I/O PLL is a frequency-control system that generates an output clock by synchronizing itself to an input clock. The PLL compares the phase difference between the input signal and the output signal of a voltage-controlled oscillator (VCO) and then performs phase synchronization to maintain a constant phase angle (lock) on the frequency of the input or reference signal. The synchronization or negative feedback loop of the system forces the PLL to be phase-locked.
You can configure PLLs as frequency multipliers, dividers, demodulators, tracking generators, or clock recovery circuits. You can use PLLs to generate stable frequencies, recover signals from a noisy communication channel, or distribute clock signals throughout your design.
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