Leakage Prevention Device for DRAM Current Leakage Reduction
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Solution Overview
Problem
Dynamic random access memory (DRAM) devices face significant current-leakage issues, which necessitate frequent charging of capacitors to maintain data integrity, and existing methods to mitigate this problem are not sufficiently effective.
Innovation Solution
Incorporating a device with at least two p-n junctions, such as a lateral silicon controlled rectifier, diode for alternating current, or silicon controlled rectifier, between the transistor and capacitor in a memory cell, which effectively reduces current leakage by controlling the flow of electric charge based on voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional methods (increasing gate channel length, increasing capacitor surface area, increasing dielectric constant) are used to reduce current leakage, then current leakage is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent introduces a leakage prevention device as an intermediary component between the transistor and capacitor. This device includes a control electrode connected to the bit line and a leakage prevention electrode connected between the transistor and capacitor, forming a controlled barrier that prevents current leakage without requiring changes to the fundamental transistor or capacitor structures.
Solution Approach 2:
The patent replaces physical structural modifications (increasing channel length, surface area, or dielectric constant) with an electrical control mechanism. The leakage prevention device uses voltage control through the control electrode to activate or deactivate the leakage prevention pathway, substituting mechanical/structural solutions with an electrical field-based solution.
2Loss of energy
If conventional methods are used to reduce current leakage, then current leakage is reduced, but refresh frequency increases
Solution Approach 1:
The leakage prevention device acts as an intermediary that blocks the leakage pathway during the hold period, allowing the capacitor to maintain its charge for longer durations. This reduces the frequency at which refresh operations are needed, as the capacitor can retain data for extended periods without significant charge loss.
Solution Approach 2:
The leakage prevention device is activated periodically in synchronization with the refresh operation. During normal operation, the device is activated to prevent leakage; during refresh operations, it is deactivated to allow controlled charge transfer. This periodic activation pattern reduces overall refresh frequency while maintaining data integrity.
3Loss of energy
If the leakage prevention device is activated, then current leakage is prevented, but voltage drop occurs across the device
Solution Approach 1:
The leakage prevention device employs dynamic resistance characteristics that change based on the applied voltage. When a positive voltage is applied to the control electrode, the device transitions from a high-resistance state (preventing leakage) to a low-resistance state (reducing voltage drop). This dynamic adjustment allows the device to optimize between leakage prevention and voltage preservation based on operational conditions.
Solution Approach 2:
The device utilizes changes in electrical parameters (voltage and resistance) to control its function. By adjusting the voltage applied to the control electrode, the resistance of the leakage prevention pathway is dynamically changed, allowing the system to transition between different operational states and minimize both leakage and voltage drop under different conditions.
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 solution significantly reduces current leakage, thereby extending the time required to refresh capacitors and maintaining data integrity, as the electric charge is prevented from leaking when the transistor is turned off, thus improving the overall performance of DRAM devices.
Implementation Method 1
The leakage prevention device has a control electrode and a leakage prevention electrode. The leakage prevention device has at least two p-n junctions so that the electric charge stored in the capacitor hardly flows through the leakage prevention device
Data Source
AI summary
A device for preventing current-leakage is located between a transistor and a capacitor of a memory cell. The two terminals of the device for preventing current-leakage are respectively connected with a slave terminal of the transistor and an electric pole of the capacitor. The device for preventing current-leakage has at least two p-n junctions. The device for preventing current-leakage is a lateral silicon controlled rectifier, a diode for alternating current, or a silicon controlled rectifier. By utilizing the driving characteristic of the device for preventing current-leakage, electric charge stored in the capacitor hardly passes through the device for preventing current-leakage when the transistor is turned off to improve the current-leakage problem.