Bit Line Interconnection Using Conductive Plugs for Multiplexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As feature sizes of memory devices decrease, the difficulty of making multiplexer connections between bit lines increases, necessitating alternative processes for effectively interconnecting successively adjacent bit lines in memory devices.
Innovation Solution
The implementation of conductive plugs to electrically interconnect every other bit line, forming interconnected bit line pairs within the multiplexer, which facilitates the coupling of bit lines to sensing and latching circuitry, thereby simplifying the multiplexing process and addressing the challenges of decreasing feature sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional multiplexer connections are used between bit lines, then memory device functionality is maintained, but manufacturing difficulty increases as feature sizes decrease
Solution Approach 1:
The patent segments the bit line interconnection process by introducing conductive plugs that electrically interconnect every other bit line, forming interconnected bit line pairs. This segmentation approach simplifies the overall multiplexer connection structure by breaking down the complex many-to-one mapping into simpler paired connections, thereby reducing manufacturing difficulty despite smaller feature sizes
Solution Approach 2:
The patent introduces conductive plugs as intermediary elements between bit lines and the multiplexer. These conductive plugs serve as mediators that facilitate the electrical interconnection of adjacent bit lines, enabling simplified multiplexer connections without requiring direct complex routing between all bit lines and the multiplexer input, thus easing manufacturing constraints
2Ease of manufacture
If bit lines are directly connected to multiplexer without interconnection structures, then manufacturing is simpler, but multiplexing efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-establishing interconnected bit line pairs through conductive plugs before the final multiplexer connection step. This preliminary interconnection of every other bit line creates a simplified routing structure that maintains multiplexing efficiency while reducing the complexity of the subsequent multiplexer connection process
Data Source
AI summary
An embodiment of a memory device has a plurality of conductive plugs formed on a semiconductor substrate and a pair of successively adjacent first and second bit lines overlying and in contact with each of the conductive plugs.