Sense Amplifier Boundary Determination via Bit Line Precharge
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Solution Overview
Problem
Sense amplifiers in DRAM devices often generate errors during data reading due to difficulties in determining the sense boundary, affecting the amplification performance and accuracy of data retrieval.
Innovation Solution
A method and apparatus for determining the sense boundary of a sense amplifier by writing the same data into memory cells controlled by paired word lines, activating one word line, precharging bit lines, and reading data after a preset row precharge time to identify the critical row precharge time when errors occur, allowing for measurement of the sense amplifier's capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sense amplifier operates at the sense boundary, then the data reading speed is improved, but the accuracy deteriorates due to sense errors
Solution Approach 1:
The patent applies preliminary action by precharging bit lines to a specific voltage level before the sense amplifier operates at the sense boundary. This precharging process prepares the bit lines in advance to ensure that even when operating at the boundary condition, the voltage differential remains sufficient for accurate sensing, thus maintaining both speed and accuracy
2Productivity
If the row precharge time is reduced to improve productivity, then the data processing efficiency is improved, but the sense amplifier generates errors at the sense boundary
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bit line precharge voltage level based on the row precharge time. When row precharge time is reduced to improve productivity, the system compensates by modifying the precharge voltage parameter to maintain the voltage differential above the sense boundary, thereby preventing errors while achieving higher processing efficiency
3Use of energy by moving object
If the sense amplifier operates closer to the sense boundary, then the power consumption is reduced, but the sense errors increase
Solution Approach 1:
The patent applies preliminary action by precharging bit lines to an optimized voltage level before sensing operations. This precharging prepares the system in advance to operate closer to the sense boundary with reduced power consumption, while the precharged state ensures that the voltage differential remains sufficient to prevent sense errors, thus achieving both low power consumption and high reliability
Data Source
AI summary
A method for determining a sense boundary of a sense amplifier includes: writing the same data into the memory cells controlled by at least a pair of first word line on the left side and second word line on the right side corresponding to the sense amplifier; activating the first word line and precharging bit lines corresponding to the first word line; reading the data in the memory cells controlled by the corresponding second word line after a preset row precharge time; and determining a corresponding critical row precharge time as a row precharge time boundary value when the sense amplifier does not correctly read the data in the memory cells controlled by the second word line.