Analysis and Stabilization of Signal Reflections in Gate-to-Gate Connections for AQFP Circuits

Autor: Michael A. Johnston, Christopher L. Ayala, Tomoyuki Tanaka, Nobuyuki Yoshikawa
Rok vydání: 2023
Předmět:
Junctions
Standards
matching network
Reflection
maximum propagation delay
large-scale superconductor circuits
AQFP circuits
superconducting logic circuits
Adiabatic logic
integrated circuit interconnections
energy analysis
interconnection modelling
quantum flux parametron (QFP)
impedance matching network
Electrical and Electronic Engineering
microwave circuits
transmission line effects
signal reflections
lossless transmission line model
resistance 8 ohm
impedance matching
signal integrity
transmission lines
standard buffer gate
Impedance
time 6.1 ps
Logic gates
transmission line
microwave circuit theory
data signals
Condensed Matter Physics
conventional digital logic circuits
transmitted data
frequency content
stabilization
Electronic
Optical and Magnetic Materials
gate-to-gate connections
size 3.0 mm
data signal integrity
Power transmission lines
timing characteristics
integrated circuit modelling
Zdroj: IEEE Transactions on Applied Superconductivity. 33:1-5
ISSN: 2378-7074
1051-8223
Popis: Signal integrity of transmitted data is critical for achieving highly dense, large-scale superconductor circuits. Transmission line effects, such as signal reflections, are investigated and concepts from microwave circuit theory and conventional digital logic circuits are applied to AQFP circuits. The lossless transmission line model is used for interconnection modelling. The frequency content and timing characteristics of data signals are used to analytically predict a maximum propagation delay of 6.1 ps before failure due to reflections. This coincides well with our own results, and with those obtained in a separate study using simulation techniques. The investigation then extends towards the design of an impedance matching network with the aim of reducing reflections. The input impedance of a standard buffer gate is derived, and then matched to an 8 Ω transmission line. The proposed impedance matching network maintains data signal integrity up to 3 millimetres. Energy analysis of the matching network is also performed and a 36 % increase in length for similar energy consumption is achieved over alternative solutions.
Databáze: OpenAIRE
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