Memory Device Bit Line Utilization via Dynamic Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In memory devices with an open bit line structure, un-coupled bit lines are not utilized due to the absence of reference bit lines, leading to inefficiency and increased area requirements, which contribute to higher fabrication costs.
Innovation Solution
A memory device with a separation unit that electrically couples and separates bit lines from sense amplifiers during specific operational periods, allowing all bit lines to be used without the need for additional cell arrays, and includes a precharge unit for efficient voltage management and data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an open bit line structure is used, then the area of the memory device is reduced, but un-coupled bit lines cannot be utilized leading to inefficiency
Solution Approach 1:
The patent applies the dynamics principle by making the electrical coupling between bit lines and sense amplifiers time-dependent. The coupling is dynamically established during the sensing operation and dynamically broken during the precharge operation. This dynamic coupling allows bit lines to be utilized in the open bit line structure without requiring continuous physical coupling, thereby improving bit line utilization while maintaining the area advantages of the open structure.
Solution Approach 2:
The patent introduces a coupling node as an intermediary element between the bit line and the sense amplifier. This coupling node acts as a mediator that can be selectively connected or disconnected based on operational requirements. During sensing, the coupling node connects the bit line to the sense amplifier; during precharge, it disconnects them. This intermediary mechanism enables efficient bit line utilization in the open bit line structure without requiring permanent coupling.
2Device complexity
If bit lines are electrically coupled to sense amplifiers continuously, then sensing operation is simplified, but area requirements increase due to need for additional cell arrays
Solution Approach 1:
The patent resolves this contradiction by making the electrical coupling dynamic rather than continuous. The coupling is established only during the sensing operation when needed, and broken during the precharge operation. This dynamic approach simplifies the sensing operation by providing the necessary coupling when required, while avoiding the need for continuous coupling infrastructure that would increase area requirements.
Solution Approach 2:
The patent applies preliminary action by breaking the electrical coupling between bit lines and sense amplifiers during the precharge operation before sensing begins. This preliminary disconnection allows the system to prepare for efficient sensing by ensuring that the coupling is only present when needed, thereby avoiding the area overhead of continuous coupling arrangements.
3Productivity
If additional cell arrays are added to provide reference bit lines, then all bit lines can be utilized, but fabrication cost increases
Solution Approach 1:
The patent introduces a coupling node as an intermediary that enables bit line utilization without requiring additional cell arrays. The coupling node acts as a flexible connection point that can be dynamically connected to either the bit line or the sense amplifier based on operational requirements. This intermediary approach allows full bit line utilization while avoiding the fabrication cost of adding additional cell arrays.
Solution Approach 2:
The patent applies universality by designing the coupling node to serve multiple functions: it can couple the bit line to the sense amplifier during sensing operations, disconnect them during precharge operations, and flexibly reconfigure for different operational modes. This multi-functional component enables bit line utilization without requiring dedicated additional cell arrays, thereby reducing fabrication cost.
Data Source
AI summary
A memory device may include a cell array including a plurality of memory cells and a bit line coupled to the plurality of memory cells; a sense amplifier suitable for amplifying a voltage difference between a first line and a second line; and a separation unit suitable for electrically coupling the bit line and the first line, and electrically separating the bit line and the first line during an initial period of an operation of the sense amplifier.