关键词: 锁相环 时钟 电荷泵 噪声

Abstract:

This paper analyzes the working mechanism and the over-charge problem of the charge pump in charge pump phas-locked loops（CPPLL）, and then presents a low noise charge pump design technique. It reduces the over-charge effect and increases the stability of charge pump in phase-locked loops.

Key words: phase-locked loop, clock, charge pump, noise