Skew Reduction on a long transmission line using multiple local DLLs for high-speed imagery

A transmission line induced skew reduction system for shutter signals of a pixel array has been designed using TowerJazz CIS 0.18m technology. It is based on the use of multiple delay-locked loop in charge of close-to-close synchronization. The simulation results demonstrate the ability of the system to compensate the transmission line induced skew from 1.58ns to 75ps. The measurements made with a prototype integrating a 11.6mm servo-controlled transmission line and fours delay-locked loop demonstrated a reduction of its skew down to 32ps.