BROAD-BAND INTERFACING OF SUPERCONDUCTING DIGITAL-SYSTEMS TO ROOM-TEMPERATURE ELECTRONICS

We have developed and tested simple and inexpensive electronics for in terfacing Rapid Single-Flux-Quantum (RSFQ) Josephson-junction circuits to room temperature digital systems. Voltage-level (Non-Return-to-Zer o) bit signals with a swing of similar to 150 uV, developed on-chip by standard SFQ/DC converters, and in some cases amplified to 1.5mV swin g by HUFfLE-type circuits, are passed to the 300K environment using a high density (40 channel) flexible coplanar waveguide assembly. AC-cou pled, 2-3 stage microwave Si-biploar amps; and Emitter-Coupled-Logic ( ECL) buffers accomplish voltage level translation to the standard ECL levels, Using this technique, data rates in excess of 1Gb/s per channe l can be achieved at low cost per channel.