Charge pump circuit

Published:2011/6/23 2:42:00 Author:TaoXi | Keyword: Charge pump | From:SeekIC

The charge pump phase locked loop has the features of low power consumption, high speed, little jitter and low cost, it can be used in the wireless communication, the frequency synthesizer and the clock recovery circuit. The charge pump circuit plays the very important role in the phase locked loop(PLL), the main function of it is to change the UP and DOWN digital signals of the PFD into the analog signal, so we can control the frequency of the voltage-controlled oscillator (VCO). When the PFD gives the high precision phase error, the charge pump plays a decisive role to the performance of the whole loop.



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