Title :
New design of single-bit all-digital RSFQ autocorrelator
Author_Institution :
Dept. of Phys., State Univ. of New York, Stony Brook, NY, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
We present a new design of a Rapid Single-Flux-Quantum (RSFQ) all-digital one-bit autocorrelator for submillimeter spectrometry applications, featuring 4 GHz input signal bandwidth, double oversampling quantizer, and 16 Mbps-per-channel output rate. The delay line of the autocorrelator is based on a circular shift register with XOR gates performing multiplication of the delayed and undelayed single-bit signals at every stage. The multiplication results are accumulated by room-temperature electronics after being prescaled in on-chip binary counters consisting of 10 T flip-flops per stage. We report results of experimental testing of a 16-stage autocorrelator delay line with multiplication and for a linear array of 8 low-power T flip-flop binary counters, all fabricated in HYPRES´ standard 3.5 /spl mu/m 1000 A/cm/sup 2/ Nb-trilayer process. We also discuss physical and technical limits of the minimal power dissipation in RSFQ circuits.
Keywords :
correlators; counting circuits; delay lines; flip-flops; logic design; niobium; quantisation (signal); submillimetre wave spectroscopy; superconducting device testing; superconducting logic circuits; 16 Mbit/s; 3.5 micron; 4 GHz; HYPRES standard Nb trilayer process; Nb; T flip-flop binary counters; XOR gates; all-digital RSFQ autocorrelator; circular shift register; double oversampling quantizer; linear array; multiplication; power dissipation; rapid single-flux-quantum logic; single-bit RSFQ autocorrelator; submillimeter spectrometry applications; Autocorrelation; Bandwidth; Counting circuits; Delay lines; Flip-flops; Power dissipation; Shift registers; Signal design; Spectroscopy; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
