A resonant metamaterial clock distribution network for superconducting logic

Disentangling superconductor and dielectric microwave losses in sub-micron $\rm Nb$/$\rm TEOS-SiO_2$ interconnects using a multi-mode microstrip resonator

“…Measurements were taken at 4.2K in a LHe Dewar using an RF dip probe equipped with a 32-contact-pad test fixture. 11,18,19,21 To provide for fast sample exchange, a flip-chip press-contact technology is used, where the chip contact pads are pressed against the fixture non-magnetic Cu/Au bumps. The fixture PCB interfaces the bumps to the probe semi-rigid coaxial cables.…”

“…4 However, a metamaterial zeroth order resonator (ZOR) delivering clock and power to RQL gates at GHz frequencies dissipated twice more power than the logic junctions, due to the loss in transmission lines forming the ZOR. 11 Interconnect density remains one of the main factors limiting the scalability of all forms of superconducting logic. 12 The performance capability of an SFQ logic chip increases with the total number of logic gates, which calls for more interconnect layers with smaller wire width and spacing (pitch).…”

“…On one hand, they can provide a basic building block for GHz clock and power distribution systems. 11,18,19 On the other hand, they can form a passive transmission line, to propagate low-bandwidth (35-50 GHz) data with 7-10 SFQ pulses per bit, 19 or to propagate high-bandwidth (350 GHz) data with single SFQ pulse per bit, 20,21 or to produce a delay-line memory. 22 The power dissipation is governed by the superconductor and dielectric loss, and is inversely proportional to a transmission line resonator figure of merit, quality factor (Q-factor).…”

Printing nanoparticle-based isotropic/anisotropic networks for directional electrical circuits

“…[13][14][15][16][17] The fine-pitch interconnect technology has become one of the important research areas for the microelectronics industry to meet the increasing demands of downsizing, functionalization, and integration. [18][19][20][21] Anisotropic materials can achieve different functions in different directions. [22][23][24] As one type of interconnection materials for electronic components, anisotropic conductive films (ACFs) possess a specific directional conductivity.…”

Low clock skew superconductor adiabatic quantum-flux-parametron logic circuits based on grid-distributed blocks

“…Despite some inspiring clocking approaches discussed for RQL [22,23], a global clocking scheme to maintain low clock skew for AQFP circuits at large scale still requires attention. In this work, we investigate a global clocking scheme for low clock skew AQFP circuits by employing grid-distributed blocks synchronized by H-tree power-clock networks.…”