A 64-Spin All-to-All CMOS Ising Machine with Landscape Perturbation Achieving 2.28 nJ/Edge-Bit Energy-to-Solution
🤖 AI Summary
This work addresses the low energy efficiency and unstable solution quality of conventional Ising machines when solving fully connected spin systems. A 64-spin, fully connected current-coupled Ising chip fabricated in 65 nm CMOS technology (occupying 0.943 mm²) is presented, featuring a novel deterministic energy landscape perturbation mechanism combined with continuous programming refresh to simultaneously suppress leakage currents and enhance convergence performance. The design employs a current-mode coupling architecture with 31-level multibit coefficient control, achieving a high energy efficiency of 2.28 nJ per edge-bit and significantly improving solution success rates.
Application Category
📝 Abstract
A 64-spin all-to-all current-mode coupling Ising machine is implemented in 65 nm CMOS. The design supports 31 coefficient levels in 0.943 mm2 and achieves Energy-to-Solution (ETS) of 2.28 nJ/edge-bit. Continuous programming refresh not only mitigates leakage but also provides a mechanism for deterministic energy landscape perturbation, which consistently improves solution quality with higher success rate compared to operation without landscape perturbation.
Problem
Research questions and friction points this paper is trying to address.
Ising machine
Energy-to-Solution
combinatorial optimization
landscape perturbation
CMOS
Innovation
Methods, ideas, or system contributions that make the work stand out.
Ising machine
energy-to-solution
landscape perturbation
current-mode coupling
CMOS implementation
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