The two primary characteristics of A/Ds are the rate of conversion or sampling rate, expressed in samples per second, and the accuracy of each digital sample expressed as the number of binary bits or decimal digits per sample. Recently updated, this handbook focuses primarily on A/D converters with sampling rates higher than 100 MHz. Sampling techniques are reviewed, as well as FPGA technology. The latest Pentek board- and system-level high-speed A/D products and some applications based on these products are also presented.