SINGLE FLUX QUANTUM CROSSBAR SWITCH

A crossbar switch has been designed using Single Flux Quantum (SFQ) ga tes exclusively for all internal functions, A 4 x 4 prototype has been fabricated in our Nb process foundry with J(c) of 2000 A/cm(2). We re port on the design and performance of the switch and of an individual crosspoint element at high data rates (greater than or equal to 1 Gbps ). A novel design of a double-edge-triggered dc/SFQ converter is discu ssed. The requirements for output amplification and on-chip versus off -chip amplifier issues mill be presented.