I. Introduction
The CHARGE pump phase-locked loop (CP-PLL) is an integrated mixed-signal circuit and is used in modern systems like radio, mobile phone, and wireless Internet access [1]–[4]. Especially in mobile applications the CP-PLL is utilized due to its good integrability and low manufacturing costs. A CP-PLL can be employed for frequency synthesis, synchronization and clock and data recovery. The following five digital and analog blocks describe the principle of the CP-PLL (see Fig. 1).