A comparison of transient digitization methods for high speed analog signals

Two techniques for high-speed transient digitization of analog signals are described and compared. One approach employs a traditional high-speed flash ADC that performs real-time digitization and the other uses a fast analog memory that is slowly read out and digitized. Both techniques have been realized in a digital 0.25 /spl mu/m bulk CMOS process. The strengths and weaknesses of the two approaches are presented, and the measured data compared.