are implemented by software rather than specialized hardware.; Charge-pump PLL (CP-PLL)
:CP-PLL is a modification of phase-locked loops with a phase-frequency detector and square waveform signals. See also Gardner's conjecture on CP-PLL.

Performance parameters

*Type and order.
*Frequency ranges: hold-in range (tracking range), pull-in range (capture range, acquisition range), lock-in

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