Memristive State Readout Using I-V Curve Fitting
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Solution Overview
Problem
Memristor crossbar arrays suffer from leakage currents, limiting scalability, and complementary resistance switches require destructive readout followed by rewriting, which is inefficient.
Innovation Solution
A method for nondestructive readout of memristive states using at least two measurements during a single read-out operation, utilizing resistance-characteristic curves to identify memristive states without altering their configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If complementary resistance switches are used to reduce leakage currents, then leakage current is reduced, but the readout becomes destructive requiring rewriting
Solution Approach 1:
The patent applies parameter changes by utilizing capacitance measurements instead of traditional resistance-based readout. By measuring the capacitance of the floating gate node, the system can nondestructively read the state of complementary resistance switches, thereby maintaining low leakage current while eliminating the destructive readout problem
Solution Approach 2:
The patent substitutes the electrical resistance measurement mechanism with a capacitance measurement mechanism. This replacement allows the readout operation to sense the state through capacitive coupling without creating the large voltage drops that cause destructive effects in resistance-based readout
2Measurement precision
If multiple measurements are performed to accurately identify memristive states, then measurement precision is improved, but readout time increases
Solution Approach 1:
The patent merges multiple measurement objectives into a single capacitance measurement operation. By measuring the total capacitance of the floating gate node, the system simultaneously obtains information about the memristive state while avoiding the time penalty of sequential multiple measurements
Solution Approach 2:
The capacitance measurement serves multiple functions simultaneously: it nondestructively reads the memristive state, maintains the integrity of the stored information, and provides sufficient precision for accurate state identification all in a single operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and efficient reading of multiple memristive states without destructive readout, enhancing scalability and reducing complexity in data processing applications.
Implementation Method 1
resistance-characteristic curves to identify memristive states
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2C
AI summary
According to various aspects, a method is provided including: setting a memristive element into a memristive state of a plurality of memristive states, determining one or more static state parameter values (812) of the memristive element associated with the memristive state, wherein determining the one or more static state parameter values (812) includes: determining a current/voltage characteristic (806) of the memristive element, and fitting (808) the current/voltage characteristic (806) based on a physical model to determine the one or more static state parameter values (812), wherein the physical model is based on static state parameters for which the static state parameter values (812) are determined.