Abstract
The fault-free switching of single-flux-quantum (SFQ) elements was studied by investigating SFQ pulse propagation in a ring Josephson transmission line closed with an SFQ inverter. A lifetime of more than a few hours was obtained that corresponds to at least 10/sup 15/ fault-free switching. The completely DC-powered rapid SFQ (RSFQ) sampler was used to directly measure the repetition rate stability of a Josephson generator loaded by a uniformly shunted transmission line. A stable repetition rate up to 7 GHz was obtained. The authors also report experimental results for two-stage serial and five-stage parallel quasi-digital amplifiers. The precision calculation of the input SFQ pulses is the main idea of these circuits. >
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