Precision Differential Digitizer

摘要

We have developed a high-dynamic-range, state-of-the-art, differential digitizer and used it in coherent anti-Stokes Raman spectroscopy and spontaneous Raman spectroscopy experiments. The digitizer is a high-speed device used to extract small signal pulses from large background-noise levels. It has total internal noise of less than 200 mu V to 10 V in amplitude and from approx. 30 to 500 ns wide, can be acquired. The gate window, for differential subtraction, can be varied by front-panel control from 50 to 500 ns. A five-digit display shows the digital word being presented to the computer interface, which represents the corrected pulse height. The testing procedures and the design criteria are presented. The setup procedures, with complete FORTRAN programs, are given for individual digitizer analysis. (ERA citation 08:039322)