DRAM Buffer Signal Generation Circuit Refresh Control
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Solution Overview
Problem
Dynamic random access memory (DRAM) semiconductor devices lose stored data over time due to leakage currents, requiring periodic refresh operations to maintain data retention, which can be inefficient and complex to manage.
Innovation Solution
A semiconductor device with an initial buffer signal generation circuit and a refresh control circuit that generates signals to control buffer activation and refresh operations, ensuring stable data retention by synchronizing with reference voltage signals and enabling efficient activation and deactivation of buffer circuits during initialization and refresh operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If buffer circuits are continuously activated to maintain data retention, then data loss is reduced, but power consumption increases
Solution Approach 1:
The patent implements periodic refresh operations where buffer circuits are activated only when needed (every 64ms or upon detection of voltage instability) rather than continuously. The refresh control circuit monitors reference voltage stability and triggers buffer activation only during necessary refresh intervals, reducing power consumption while maintaining data retention through periodic rather than continuous operation.
Solution Approach 2:
The refresh control circuit automatically detects when reference voltage instability occurs and autonomously activates the buffer circuits without external intervention. The system monitors its own operational state and self-regulates buffer activation based on detected voltage conditions, enabling the system to serve itself by determining when refresh operations are necessary.
2Reliability
If buffer circuits are activated frequently to prevent data loss, then data retention improves, but operation complexity increases
Solution Approach 1:
The refresh control circuit implements a feedback mechanism by monitoring the stability of reference voltage signals and using this information to control buffer activation. When voltage instability is detected, the system automatically triggers refresh operations; when stability is confirmed, normal operations resume. This closed-loop feedback system simplifies operation by automatically managing the complexity of buffer control based on real-time voltage conditions.
Solution Approach 2:
The system performs preliminary detection of reference voltage stability before initiating buffer activation. The refresh control circuit continuously monitors voltage conditions and is prepared to activate buffers immediately when instability is detected, rather than waiting for data loss to occur. This preliminary monitoring and preparedness simplifies the operational response time and automates the decision-making process.
3Reliability
If reference voltage signals are stabilized to improve buffer control precision, then data retention improves, but device complexity increases
Solution Approach 1:
The refresh control circuit acts as an intermediary between the reference voltage signals and the buffer circuits. It monitors voltage stability and mediates the activation decisions, translating voltage conditions into appropriate buffer control actions. This intermediary component simplifies the overall system by centralizing the control logic and providing a clear interface between voltage monitoring and buffer activation without requiring direct complex interactions between multiple components.
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 precise control over buffer activation and refresh operations, enhancing data retention in DRAM devices by stabilizing the transition between initialization and refresh phases, thus reducing data loss and improving overall memory performance.
Implementation Method 1
The initial buffer signal generation circuit generates an initial buffer signal from an external control signal in response to a first reference voltage signal
Implementation Method 2
The buffer signal generation circuit generates a buffer signal from the external control signal in response to a second reference voltage signal
Data Source
AI summary
A semiconductor device includes an initial buffer signal generation circuit and a buffer signal generation circuit. The initial buffer signal generation circuit includes an initial buffer circuit which is activated if an initialization operation terminates. The initial buffer signal generation circuit generates an initial buffer signal from an external control signal in response to a first reference voltage signal. The buffer signal generation circuit includes a buffer circuit which is activated in response to the initial buffer signal. The buffer signal generation circuit generates a buffer signal from the external control signal in response to a second reference voltage signal.