In this chapter, we describe another design of an 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
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Nb-trilayer
process.