Josephson analog-to-digital converter using self-gating-AND circuits as comparators

摘要: This paper describes the comparator stage of a Josephson junction 4-bit A/D converter. It utilizes periodic nature SQUID's to make A/DC with only four comparators for parallel conversion. A new design symmetrical three-junction SQUID provides identical lobes beyond required. The necessary short aperture time is obtained by imbedding in self-gating-AND circuits that detect input signal during rising edge clock. binary resistor divider correct proportions comparators. Both computer simulation results and low-frequency test are presented.