Resistive Change Memory Array Dynamic Current Sourcing
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Solution Overview
Problem
Current resistive change memory devices face challenges in achieving higher speed, lower power operation, and reduced error rates, particularly in accessing and determining the resistive states of resistive change elements in arrays.
Innovation Solution
The implementation of a resistive change element array with a circuit that selects resistance from resistive reference elements to source or sink current, allowing for tailored current flow based on resistance values, which compensates for circuit conditions and enables efficient read, set verify, and reset verify operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional current sourcing methods are used in resistive change memory devices, then the basic read and write operations can be performed, but the operation speed is limited and power consumption is higher
Solution Approach 1:
The patent implements dynamic current sourcing by selecting different resistive reference elements based on the specific operation being performed (read, set verify, reset verify). The circuit transitions from static current sourcing to dynamic adaptation, where the reference element resistance is changed in real-time to match operational requirements, thereby improving speed while optimizing power consumption for each specific operation type
Solution Approach 2:
The patent changes the resistance parameter of the current sourcing circuit by selecting from multiple resistive reference elements with different resistance values. This parameter adaptation allows the circuit to optimize current flow characteristics for different operations, enabling faster operation speeds while reducing unnecessary power consumption by matching the resistance to the specific operational needs
2Reliability
If conventional read operations are performed without tailored current flow, then resistive states can be determined, but error rates increase and reliability decreases
Solution Approach 1:
The patent introduces resistive reference elements as intermediary components that mediate between the power source and the resistive change elements. These reference elements act as adaptive current regulators, providing tailored current flow that improves the accuracy and reliability of resistive state determination. The added complexity of these intermediary components is justified by the significant improvement in error reduction and operational reliability
Solution Approach 2:
The patent implements a feedback mechanism where the selection of resistive reference elements is based on the specific operation being performed (read, set verify, reset verify). This feedback loop ensures that the appropriate current characteristics are applied for each operation type, thereby reducing errors and improving reliability. The feedback control manages the complexity by systematically selecting reference elements based on operational state
3Speed
If higher current is used to improve operation speed, then speed increases, but voltage and current usage increases leading to higher power consumption
Solution Approach 1:
The patent changes the resistance parameter of the reference elements to optimize the balance between speed and power consumption. By selecting reference elements with appropriate resistance values for specific operations, the circuit achieves fast operation speeds without requiring excessive current, thereby managing power consumption effectively while maintaining high-speed performance
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
This approach enhances the speed and reduces errors in determining resistive states, allowing for lower voltage and current usage, thereby improving the performance and reliability of resistive change memory devices.
Implementation Method 1
selecting a resistance for an operation of the at least one resistive change element, supplying an amount of current for the operation based on the resistance for the operation
Data Source
AI summary
Devices and methods for accessing resistive change elements in a resistive change element array to determine resistive states of the resistive change elements are disclosed. According to some aspects of the present disclosure the devices and methods access resistive change elements in a resistive change element array through a variety of operations. According to some aspects of the present disclosure the devices and methods supply an amount of current tailored for a particular operation. According to some aspects of the present disclosure the devices and methods compensate for circuit conditions of a resistive change element array by adjusting an amount of current tailored for a particular operation to compensate for circuit conditions of the resistive change element array.