Repeater Insertion in SFQ Interconnect

Global interconnects in VLSI complexity single flux quantum systems

“…A primary issue in superconductive PTLs is the impedance match between the PTL and the Josephson junctions. Due to the partial reflection and imperfect match between the PTL and the driver and receiver, resonant effects can occur in long PTL lines [11,[40][41][42]. This resonant effect depends upon the length of the PTL and the frequency of the SFQ signal.…”

“…which ℎ is the phase velocity [11] of the superconductive passive interconnect. is the physical length of the PTL interconnect, and is an integer multiplier that describes the harmonics of the resonance frequency.…”

“…: Energy vs. length of CMOS (dash line), JTL (solid line), and PTL with one Josephson junction in the receiver (dash-dotted line) [10][11][12][13][14].…”

“…The PTL line exhibits a constant energy independent of length. The energy of the CMOS interconnect is approximately six orders of magnitude greater than the energy dissipated by a passive superconductive interconnect [11][12][13][14].…”

“…2. Due to the coincidence of the input SFQ pulse with the reflection of the previous pulse, resonant effects occur in long passive transmission lines [11]. The resonance in PTLs is dependent on the length of the PTL segment and the frequency of the SFQ signal.…”