Resistive Memory Write Circuit with Complementary Cell Feedback
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Solution Overview
Problem
Resistive memory elements, particularly magnetic tunnel junction devices, face challenges in reducing writing energy consumption and efficiently stopping the writing process after data is written, due to their low tunnel magnetoresistance ratio and the need for prolonged write current pulses.
Innovation Solution
A data write circuit for resistive memory elements comprising a complementary resistive memory element, writing means to induce resistance changes, detection means to monitor the writing state, and control means to manage the writing process based on detected signals, allowing for precise control and energy-efficient writing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If write current is kept supplied to the resistive memory element after resistance state change, then writing operation is completed, but power consumption increases
Solution Approach 1:
The patent employs a sense amplifier to detect the resistance state of the resistive memory element and feeds this information back to the write circuit. When the resistance state change is detected, the write circuit automatically stops supplying write current, thereby reducing power consumption while ensuring writing completion.
Solution Approach 2:
The resistive memory element itself serves the dual function of data storage and writing completion detection. The change in its resistance state, which is inherent to its operation, is utilized by the sense amplifier to signal when writing is complete, eliminating the need for separate detection mechanisms.
2Measurement precision
If complementary cell is used to improve output sensitivity, then detection sensitivity improves, but writing energy increases
Solution Approach 1:
The sense amplifier in the complementary cell provides feedback on the resistance state change to the write circuit. This enables the write circuit to stop current supply at the appropriate moment, reducing the total writing energy while maintaining the sensitivity benefits of the complementary cell structure.
Solution Approach 2:
The writing process uses periodic current pulses rather than continuous current supply. The write circuit applies current in controlled pulses and pauses based on feedback from the sense amplifier, reducing overall energy consumption while achieving the required writing effect.
3Reliability
If long time period write current pulses are applied, then writing operation is secure, but energy consumption increases
Solution Approach 1:
The sense amplifier continuously monitors the resistance state during the writing process and provides real-time feedback to the write circuit. This enables precise control of the write current duration, ensuring sufficient writing time for reliable operation while stopping current supply as soon as the resistance state change is detected, thereby minimizing energy consumption.
Solution Approach 2:
The write circuit dynamically adjusts the duration of write current pulses based on real-time feedback from the sense amplifier. Rather than using fixed long pulses, the system adapts the pulse duration to the actual writing requirements, reducing energy consumption while maintaining writing reliability.
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
The solution enables low-energy writing with a simple circuit configuration by accurately detecting writing completion and terminating the write current, thereby reducing energy consumption and improving writing efficiency.
Implementation Method 1
Resistive memory elements are memory elements that use a resistance state due to write current
Implementation Method 2
as a resistive memory element, a magnetic tunnel junction device (MTJ device) has a relatively low tunnel magnetoresistance ratio TMR
Data Source
AI summary
A data write circuit of a resistive memory element is provided, the device being capable of writing with low writing energy using a simple circuit. The data write circuit of the resistive memory element, includes: a complementary resistive memory element; writing means for making the complementary resistive memory element cause a resistance change; detection means for detecting a writing state in the complementary resistive memory element; and control means for controlling writing by the writing means, based on a detected signal of the detection means.