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Would someone please enlighten what is the difference between a Pre-scaler and Divider within a Phase Locked Loop(PLL). As both are some form of divider then what is the need for a pre-scaler within a PLL.
just to complement what has been said .. Prescalers migh have some input conditionning circuit either to square it ,amplify it or limite it .before it can be fed to the digital stage .The Digital stage is usually a high speed circuit !