Single Transistor Sub-Word Line Drivers for Memory
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Solution Overview
Problem
Conventional memory devices with multiple transistor sub-word line drivers occupy significant space, consume high power due to multiple phase drivers, and have complex manufacturing processes.
Innovation Solution
Implementing memory systems with single-transistor sub-word line drivers that use a single phase driver, where word lines are coupled to two global word lines to float unselected lines, reducing power consumption and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transistor sub-word line drivers are used, then reliable word line control is achieved, but device area and manufacturing complexity increase significantly
Solution Approach 1:
The patent extracts the essential function of sub-word line drivers by removing redundant transistors. Instead of using multiple transistors per sub-word line driver, the invention uses a single transistor coupled with a main word line driver to achieve the same word line control function, thereby reducing device complexity while maintaining reliability
Solution Approach 2:
The main word line driver is designed to serve multiple functions: it directly drives selected word lines and simultaneously controls unselected word lines through the single transistor sub-word line drivers. This multi-functional approach eliminates the need for separate dedicated drivers for each word line, reducing overall driver complexity
2Ease of operation
If multiple phase drivers are used for sub-word line drivers, then precise phase control is achieved, but power consumption increases
Solution Approach 1:
The patent merges the phase control function into a single shared phase driver that controls the single transistor sub-word line drivers. Instead of having separate phase drivers for each sub-word line driver, one phase driver manages all transistors, reducing power consumption while maintaining precise phase control through the unified control mechanism
Solution Approach 2:
The single transistor sub-word line drivers automatically respond to the phase control signals from the shared phase driver, eliminating the need for additional dedicated phase control circuitry for each driver. The system uses its existing phase infrastructure efficiently to control the simplified driver structure
3Reliability
If conventional sub-word line drivers are used, then complete word line isolation is achieved, but manufacturing process complexity increases
Solution Approach 1:
The invention extracts only the essential isolation function by using a single transistor per sub-word line driver instead of multiple transistors. This simplified structure reduces the number of manufacturing steps and material layers required, making the fabrication process easier while maintaining adequate word line isolation through the single transistor's switching capability
Data Source
AI summary
Memory with single transistor sub-word line drivers, and associated systems, devices, and methods are disclosed herein. In one embodiment, an apparatus comprises a plurality of first sub-word line drivers and a plurality of second sub-word line drivers. Each sub-word line driver of the plurality of first sub-word line drivers is coupled to (a) a first global word line and (b) a corresponding one of a plurality of first local word lines. Each sub-word line driver of the plurality of second sub-word line drivers is coupled to (a) a second global word line different from the first global word line and (b) a corresponding one of a plurality of second local word lines. In addition, individual ones of the plurality of first local word lines are interleaved with individual ones of the plurality of second local word lines.