We have investigated the applicability of Single Flux Quantum (SFQ) and Multiple Flux Quanta (MFQ) approaches to communications between RSFQ logic/memory chips. SFQ pulses can be transmitted between chips if inductive discontinuity L lies below 3-5 pH. For larger L one can employ MFQ pulses which have the same width as the SFQ pulses, but M times larger amplitude. For example, for L=20 pH, M=4 is sufficient. We have developed an MFQ driver and a receiver capable of transmitting the data in 10-20 Gbps/pin range for the use in simple flip-chip MCM packages based on Si substrates.
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Polonsky et al. (1997) studied this question.
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