Ring Oscillator Ising Machine Layout for Phase Coupling
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Solution Overview
Problem
Existing Ising machine systems face challenges in efficiently solving complex Ising problems due to limitations in cross-coupling effects and phase relationships between oscillators, leading to increased latency and power consumption.
Innovation Solution
The proposed Ising machine system utilizes a layout of ring oscillators with unique phase index numbers, arranged in a two-dimensional array with cross-coupling between oscillators at specific phase index matching points, allowing for dynamic phase coupling and optimized propagation distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional Ising machine systems use cross-coupled oscillators to solve Ising problems, then the system can provide high-quality answers to combinatorial optimization problems, but the system experiences increased latency and power consumption
Solution Approach 1:
The patent transitions from traditional linear or random oscillator arrangements to a two-dimensional toroidal grid layout. This spatial reorganization allows oscillators to be arranged in rows and columns with wraparound connections, creating efficient geometric paths for signal propagation and reducing the physical distance signals must travel between coupled oscillators.
Solution Approach 2:
The patent implements dynamic control of coupling strengths between oscillators through adjustable parameters. By modifying coupling strength parameters in real-time, the system can optimize the balance between solution quality and convergence speed, allowing faster exploration of the solution space while maintaining accuracy.
2Measurement precision
If traditional Ising machine systems use cross-coupled oscillators to solve Ising problems, then the system can provide high-quality answers to combinatorial optimization problems, but the system experiences increased power consumption
Solution Approach 1:
The two-dimensional toroidal grid layout reduces the average distance between coupled oscillators compared to traditional arrangements. This geometric optimization decreases the number of interconnect elements and signal transmission paths required, directly reducing power consumption while maintaining the cross-coupled interaction necessary for solving Ising problems.
Solution Approach 2:
Dynamic adjustment of coupling strength parameters allows the system to reduce energy expenditure on weak or unnecessary couplings while maintaining strong couplings where they contribute most to solution quality. This parameter optimization enables the system to achieve the same solution quality with lower overall power consumption.
3Loss of time
If ring oscillators are arranged in a two-dimensional toroidal grid with cross-coupling at phase index matching points, then the system achieves reduced latency and power consumption, but the system complexity increases
Solution Approach 1:
The two-dimensional toroidal grid is segmented into regular rows and columns with systematic wraparound connections. This segmentation creates a modular structure where each oscillator follows the same coupling pattern based on its position, reducing design complexity through regularity and enabling systematic implementation despite the increased number of connections.
Solution Approach 2:
The phase index matching mechanism serves multiple functions simultaneously: it identifies coupled oscillators, establishes coupling strength, and enables dynamic reconfiguration. This universal mechanism reduces the need for separate control circuits for each connection, managing system complexity through functional consolidation.
Data Source
AI summary
One example includes an Ising machine system. The system includes a plurality of ring oscillators that are each configured to propagate an oscillation signal. Each of the ring oscillators can be cross-coupled with at least one other of the ring oscillators via a respective one of the oscillation signals to provide a respective phase coupling between the respective cross-coupled ring oscillators. The system also includes an Ising machine controller configured to generate control signals corresponding to parameters of an Ising problem and including a plurality of delay selection signals. The Ising machine controller can provide at least one of the delay selection signals to each of the ring oscillators. The delay selection signal can be configured to set a variable propagation delay of the ring oscillator to control the relative phase coupling of each of the ring oscillators to each of the at least one other of the ring oscillators.