Semiconductor Memory Precharge Potential Control Circuit
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Solution Overview
Problem
Conventional semiconductor memories experience increased power consumption during the precharge period due to continuous voltage application, leading to electric current flow regardless of reading or writing operations, which is inefficient and wasteful.
Innovation Solution
A semiconductor memory with a precharge potential control circuit that applies a low voltage when the data line pair's potential is higher than a first predetermined value, a high voltage when it's lower than a second predetermined value, and no voltage when the potential is within a specific range, thereby minimizing current flow during the precharge period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant voltage is applied to the data line pair during the precharge period, then the initial potential is maintained, but electric current flows continuously causing increased power consumption
Solution Approach 1:
The precharge potential control circuit dynamically adjusts the voltage applied to the data line pair based on real-time potential detection. When the potential difference exceeds thresholds, voltage is applied; when within thresholds, voltage is stopped. This dynamic control eliminates continuous current flow while maintaining reliability.
Solution Approach 2:
The circuit uses feedback mechanisms to detect the potential of the data line pair and adjust the precharge voltage accordingly. The detection circuit monitors potential differences and feeds this information back to the precharge potential control circuit, which then controls voltage application to maintain potential within acceptable ranges without continuous power consumption.
2Reliability
If high voltage is continuously applied to precharge the data line pair, then the initial potential is ensured, but unnecessary current flow occurs when potential is already within acceptable range
Solution Approach 1:
Instead of continuously applying full precharge voltage, the circuit applies voltage partially and only when necessary. The precharge operation is performed in a controlled manner, applying voltage only when the potential difference exceeds the threshold, and stopping when within the acceptable range, thus avoiding excessive energy consumption.
Solution Approach 2:
The circuit changes the voltage parameter dynamically based on the current state of the data line pair. The precharge potential control circuit adjusts the applied voltage from high to zero based on detected potential levels, using threshold comparisons to determine when voltage application should start and stop, thereby optimizing energy usage.
Data Source
AI summary
A semiconductor memory including a memory cell, a bit line pair connected to the memory cell, a data line pair connected to the bit line pair through a switching element capable of ON/OFF switching in response to a value of a column selection signal and a precharge circuit for controlling an initial potential common between the data line pair. The semiconductor memory comprises a precharge potential control circuit which applies, in a precharge period, a low apply voltage not higher than a first predetermined potential to the data line pair when the initial potential of the data line pair is higher than the first predetermined potential, a high apply voltage not lower than a second predetermined potential to the data line pair when the potential of the data line pair is lower than the second predetermined potential or no voltage when the potential of the data line pair is not higher than the first predetermined potential and not lower than the second predetermined potential.