A fully integrated 16-channel RSFQ autocorrelator operating at 11 GHz.

We present the results of low- and highspeed testing of a fully integrated all-digital one-bit RSFQ autocorrelator for short-millimeter and submillime ter wave spectrometry applications. The 16-channel device, complete with a 16x9 array of binary counters, on-chip double-oversampling quantizer and on -chip clock was operational at clock speeds of up to 11 GHz. The total numb er of Josephson junctions in the design was 1672, while the estimated total power dissipation was less than 0.1 mW. For high-speed testing of the devi ce we have developed a specialised 16-channel room-temperature interface ca pable of realtime data acquisition at a 16 Mbps-per-channel output rate. Ex tensive high-speed on-chip testing of the autocorrelator has also been perf ormed, both in analog and digital modes, in the latter mode with an additio nal on-chip clock controller. All chips were fabricated in HYPRES' standard 3.5-mu m 10 mu A/mu m(2) Nb-trilayer process. We also present a new concep t of a las-channel autocorrelator system built on 8 independent identical c hips with approximately 2,500 Josephson junctions per chip, i.e. within the reach of the present-day fabrication technology.