Content-Addressable Memory, Such as Crossbar Array

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This invention is a circuit device that uses two memristors to control the direction of electrical current through a crossbar array or content-addressable memory (CAM). A first memristor holds a resistance value suited to its role at the intersection of row and column lines in the array, while a second memristor acts as a steering element by switching between a low-resistance state and a high-resistance state relative to defined thresholds. Depending on which resistance state the second memristor is in, the electrical signal takes one of two distinct states, effectively determining the current direction through the first memristor. This two-memristor approach enables reliable binary state encoding without traditional transistor-based switching circuits.

Use CasesContent extracted from patent full text and abstract with AI.

• Implementing content-addressable memory (CAM) cells in neuromorphic computing hardware where fast parallel search operations are required.
• Building dense crossbar array memory architectures for non-volatile data storage in embedded systems and IoT devices.
• Enabling resistive computing fabrics for in-memory computing applications such as matrix-vector multiplication in AI accelerators.
• Designing low-power memristive logic circuits where current direction encodes binary logic states.
• Constructing reconfigurable hardware lookup structures in FPGAs or similar programmable logic devices based on memristive crossbar arrays.

BenefitsContent extracted from patent full text and abstract with AI.

• Eliminates the need for conventional transistor-based select devices at each crossbar intersection, enabling higher cell density.
• Provides reliable binary state discrimination by using well-defined low and high resistance thresholds on the steering memristor, reducing read errors.
• Leverages the non-volatile nature of memristors to retain state without continuous power, lowering standby energy consumption.
• Simplifies the circuit architecture at each crosspoint to just two memristors, reducing fabrication complexity and cost.
• Enables bidirectional current control through a single memristor cell, expanding the functional versatility of crossbar array designs.
• Supports scalable integration into large crossbar arrays for content-addressable memory applications requiring fast parallel search.

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Patent Abstract

The device for specifying one of two states of an electrical signal to determine the direction of a current through a memristor in a crossbar array or in a content-addressable memory is provided with a first memristor, which has a resistance value provided for its application at a crossing point between row and column lines of a crossbar array or a content-addressable memory, and a second memristor for determining the current direction through the first memristor. The second memristor has either a low-resistance value below a specified first threshold or a high-resistance value above a specified second threshold. The two thresholds are identical or the second threshold is greater than the first threshold by a specified value. The electrical signal assumes one state when the second memristor is low-resistance, and assumes the other state when the second memristor is high-resistance.