A Fast-Locked Bang-Bang All-Digital Phased-Locked Loop Using Successive-Approximation Frequency-Search Algorithm

Digital system such as system-on-chip microprocessor generally requires Phased-Locked Loop (PLL) for clock generation. However, traditional analog PLL typically contains several important components not included in a standard cell library, such as resistor and low leakage capacitor, which makes it difficult to integrate into a digital system. In addition, its performance is limited by process, voltage, and temperature variation.