发明授权
US06791379B1 Low jitter high phase resolution PLL-based timing recovery system 有权
低抖动高相位分辨率基于PLL的定时恢复系统

Low jitter high phase resolution PLL-based timing recovery system
摘要:
A low jitter, high phase resolution phase lock loop incorporating a ring oscillator-type VCO is designed and constructed to operate at a characteristic frequency M times higher than a required output clock frequency. Multi-phase output signals are taken from the VCO and selected through a Gray code MUX, prior to being divided down to the output clock frequency by a divide-by-M frequency divider circuit. Operating the VCO at frequencies in excess of the output clock frequency, allows jitter to be averaged across a timing cycle M and further allows a reduction in the number of output phase taps, by a scale factor M, without reducing the phase resolution or granularity of the output signal.
信息查询
0/0