A direct coupled Josephson sampler concept with a vortex to vortex transition sampling pulse generator

A Josephson sampler with direct resistive coupling between sampling gate and sampling pulse generator has been designed and simulated. The sampling gate and the sampling pulse generator comprise two Josephson junction interferometers. A short sampling pulse of 3ps width is generated at a suitable vortex to vortex transition. Delays up to 200ps between the sampling pulse and the main trigger input could be generated with an electronically adjustable circuit on the same chip. A layout of the complete sampling circuit, i.e. the sampling gate, the sampling pulse generator and the electronic delay circuit on a single 36mm²chip has been achieved for the Nb-NbxOy-PbInAu technology. The minimum line width is 8μm. For kA/cm²a time resolution of 3.5ps is predicted.