A 7.1mW 10GHz all-digital frequency synthesizer with dynamically reconfigurable digital loop filter in 90nm CMOS

Abstract

ADPLL frequency synthesizers have recently drawnsignificant research attention as the technology paradigm shifts into the nanometer CMOS arena [1–5]. They circumvent several design issues that conventional charge-pump-based PLLs encounter, including capacitor leakage, current mismatch, and limited dynamic range. Furthermore, they benefit from replacing the bulky passive loop filter by a more cost-effective and flexible digital filter.