Patent ID: 7078977
Filing Date: 2006-07-18
Classification: H03L

Abstract:
1. A fast-locking phase-locked loop system configured to produce an output signal having a desired characteristic based on an applied reference signal, comprising: a voltage controlled oscillator configured to produce the output signal; a charge pump system operatively coupled with the voltage controlled oscillator and configured to generate currents that control the phase and frequency of the output signal produced by the voltage controlled oscillator, where the charge pump system includes: an error detector operatively coupled with the charge pump system and configured to provide an error signal to the charge pump system upon which the charge pump currents are based, where the error detector includes a cycle slip detector configured to detect cycle slippage between the output signal and the reference signal, and where the cycle slip detector is configured to apply an activating signal to the additional charge pump upon detection of cycle slippage occurring between the output signal and the reference signal, the cycle slip detector including edge-triggered latches coupled with U and D outputs of a phase frequency detector.