Semiconductor Memory Word Line Failure Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor memory devices become more integrated, the decreasing distance between word lines can lead to improper electrical coupling, affecting the performance of memory cells, which existing technologies fail to effectively detect and address.
Innovation Solution
A semiconductor memory device with a word line failure detection unit that supplies a test voltage to selected word lines and detects the transferred voltage to identify improper electrical coupling, using a voltage supply section and a voltage detection section with a comparator, driver, storage unit, and reset unit to generate failure information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the distance between word lines is decreased to increase integration, then the degree of integration is improved, but improper electrical coupling between word lines occurs
Solution Approach 1:
The patent applies preliminary action by performing word line electrical coupling detection before the device is shipped to customers. The detection unit tests whether test voltages applied to first word lines are improperly transferred to second word lines during manufacturing, allowing defects to be identified and addressed before deployment, thus resolving the contradiction between high integration and reliable electrical coupling
2Quantity of substance
If the distance between word lines is decreased to increase integration, then the degree of integration is improved, but detection of electrical coupling failures becomes more difficult
Solution Approach 1:
The patent uses an intermediary approach by introducing a dedicated detection unit with test voltage generation and measurement circuits. This intermediary detection mechanism facilitates the measurement of electrical coupling between closely spaced word lines by using test voltages and measurement units, making detection feasible despite the reduced distances between word lines in high integration designs
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
Enables the detection of improper electrical coupling between word lines, allowing for the identification and potential repair of failures, thereby improving the performance and reliability of semiconductor memory devices.
Implementation Method 1
a word line failure detection unit suitable for supplying a test voltage to a test target word line selected from among the plurality of word lines, and for detecting the test voltage transferred from at least one of the plurality of word lines
Data Source
AI summary
A semiconductor memory device includes a plurality of memory cells electrically coupled to a plurality of word lines and a word line failure detection unit suitable for supplying a test voltage to a test target word line selected from among the plurality of word lines, and for detecting the test voltage transferred from at least one of the plurality of word lines, wherein the at least one of the plurality of word lines does not include the test target word line.