Phase locked loop integrated circuits having fast locking characteristics and methods of operating same

摘要

An integrated circuit device includes a fast-locking phase locked loop (PLL). This PLL includes a phase-frequency detector and first and second charge pumps, which are responsive to first and second control signals generated by the phase-frequency detector. The first and second charge pumps have different current sourcing characteristics when the first control signal is active and different current sinking characteristics when the second control signal is active.