Magnetic Memory Read Circuit Dual Voltage Self-Reference
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Solution Overview
Problem
Current magnetic memory technologies face challenges in accurately reading data from magnetoresistive effect elements due to variations in manufacturing processes, leading to read errors and inefficiencies in data retrieval.
Innovation Solution
The implementation of a magnetic memory system that utilizes two distinct read voltages (VR1 and VR2) with different pulse shapes to determine the resistance state of magnetoresistive effect elements, allowing for self-reference data reading without altering the magnetization alignment, thereby reducing read errors and shortening operation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single read voltage is applied to the magnetoresistive effect element, then the reading operation is simple and fast, but read errors occur due to manufacturing process variations
Solution Approach 1:
The patent applies a first read voltage to preliminarily charge the magnetoresistive effect element before the actual reading operation. This preliminary charging action sets up a reference state that enables more accurate subsequent reading by comparing against a known initial condition, thereby compensating for manufacturing variations without requiring complex additional circuitry.
Solution Approach 2:
The patent employs periodic application of read voltages with different amplitudes (first read voltage and second read voltage) to the magnetoresistive effect element. By periodically switching between these different voltage levels and observing the resistance state changes, the system can more reliably determine the stored data bit while accounting for manufacturing process variations.
2Reliability
If multiple read voltages are applied to improve reading accuracy, then read errors are reduced, but the operation time increases
Solution Approach 1:
The patent rapidly switches between the first and second read voltages in a time-efficient manner, minimizing the total reading operation time. By using short-duration voltage pulses and quickly transitioning between states, the system achieves accurate reading through multiple voltage levels without incurring significant time penalties.
3Measurement precision
If a high read voltage is applied to ensure clear signal detection, then measurement precision improves, but the magnetization alignment may be altered
Solution Approach 1:
The patent applies different voltage levels (first read voltage and second read voltage) at different stages of the reading operation. The first read voltage is used for preliminary charging, while the second read voltage is used for actual data detection. This localized application of different voltage qualities allows clear signal detection without exceeding the threshold that would alter magnetization alignment.
Solution Approach 2:
The patent changes the voltage parameter dynamically during the reading operation by switching between two distinct read voltage levels. This parameter variation enables the system to achieve both clear signal detection and preservation of magnetization alignment by keeping individual voltage levels below the switching threshold while utilizing their combined effect for accurate reading.
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 data reading accuracy and reduces errors by leveraging the voltage dependence of magnetoresistive effect elements, allowing for reliable data retrieval without changing the resistance state, thus improving the operational characteristics of magnetic memory systems.
Implementation Method 1
a first magnetoresistive effect element having a first resistance state or a second resistance state
Data Source
AI summary
According to one embodiment, a magnetic memory includes: a first magnetoresistive effect element having a first resistance state or a second resistance state; and a read circuit. A read circuit is configured to apply the first read voltage to the first magnetoresistive effect element, hold a first charging potential caused by the first read voltage, apply a second read voltage higher than the first read voltage to the first magnetoresistive effect element, hold a second charging potential caused by the second read voltage, and determine whether the first magnetoresistive effect element is in the first resistance state or the second resistance state based on a comparison result between the first charging potential and the second charging potential.