Physical Reservoir Element With Nonlinear Sample-and-Hold Circuit

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Solution Overview

Problem

Existing physical reservoirs struggle to achieve sufficient short-term memory property when implemented using electronic circuits, leading to suboptimal performance in processing time-series data.

Innovation Solution

Incorporating a sample-and-hold circuit and a nonlinear circuit into the physical reservoir element to enhance short-term memory and nonlinear conversion capabilities, allowing for improved interaction and processing of input signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a physical reservoir is implemented using basic electronic circuits, then the device complexity is reduced, but the short-term memory property is insufficient

Engineering Contradiction:

Improveshort-term memory propertyVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a nested structure where a sample-and-hold circuit is integrated within each physical reservoir element. The sample-and-hold circuit (containing capacitor and switch) is nested inside the reservoir element structure, allowing the element to contain sub-functional units that provide memory capability without requiring a completely separate memory device, thus improving short-term memory property while controlling overall device complexity.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The sample-and-hold circuit performs preliminary action by capturing and holding the input signal at a specific moment before the main processing occurs. The capacitor stores the voltage representation of the input signal, preserving past information that can be used for time-series data processing, thereby establishing short-term memory function in advance.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If multiple physical reservoir elements are connected to process time-series data, then the processing capability is improved, but the interaction efficiency between elements is reduced

Engineering Contradiction:

Improveprocessing capabilityVSAvoidinteraction efficiency

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent combines multiple functions within each physical reservoir element by integrating the sample-and-hold circuit directly into the element structure. This merging allows input signal reception, signal holding, and output generation to occur within a single element, reducing the number of separate components and interconnections needed, thereby improving interaction efficiency while maintaining processing capability.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250322224A1Physical reservoir element, physical reservoir, and information processing device

Publication Date: 2025.10.16 TDK CORP

AI summary

A physical reservoir element includes a first input terminal, a second input terminal, a first sample-and-hold circuit, a first output terminal, and a first nonlinear circuit. The first input terminal is connectable to an input source for transmitting an input signal to the physical reservoir. The second input terminal is connectable to one or more other physical reservoir elements. The first nonlinear circuit is disposed between the first input terminal and the first sample-and-hold circuit. A first terminal of the first sample-and-hold circuit is configured to receive a joined signal which is obtained by joining signals from the first input terminal and the second input terminal, and a second terminal of the first sample-and-hold circuit is connected to the first output terminal. The first output terminal is connectable to one or more other physical reservoir elements. The first sample-and-hold circuit holds and converts the joined signal.