Connected Source and Well in Non-Volatile Memory
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Solution Overview
Problem
In non-volatile storage systems, the large area and high resistance of the p-well lead to unstable voltage stabilization, reducing system performance due to the need for waiting for voltage stabilization before proceeding with programming operations.
Innovation Solution
Connecting the p-well directly to the source via local connections allows for faster stabilization of p-well voltage and eliminates the need for separate connections and drivers, thereby enhancing performance and saving space on the memory chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the p-well is connected via separate connections and drivers, then the well can be controlled independently, but the voltage stabilization time increases and system performance decreases
Solution Approach 1:
The patent merges the p-well connection with the source line by connecting the p-well to the source contact, eliminating the need for separate p-well connections and drivers. This integration reduces the number of components and shortens the stabilization path, directly addressing the contradiction by combining multiple functions into a single structure.
Solution Approach 2:
The source line is given dual functionality: it serves both as the source connection for the transistor and as the connection path for p-well voltage stabilization. This multi-functionality eliminates the need for dedicated p-well drivers and connections, reducing system complexity while maintaining independent well control capability.
2Area of stationary object
If separate drivers are used for the well, then precise voltage control is achieved, but memory chip space is consumed
Solution Approach 1:
The patent combines the source line and p-well connection into a single structure, eliminating the need for separate p-well drivers and their associated circuitry. This merging frees up significant memory chip space while the source line itself maintains the voltage control function through its inherent electrical connection.
Solution Approach 2:
The patent extracts the p-well control function from the separate driver circuitry and integrates it into the source line connection. By taking out the need for dedicated well drivers, the design eliminates unnecessary components and saves chip area while preserving the essential voltage control capability through the source line's electrical path.
Data Source
AI summary
A non-volatile storage device is disclosed that includes a set of connected non-volatile storage elements formed on a well, a bit line contact positioned in the well, a source line contact positioned in the well, a bit line that is connected to the bit line contact, and a source line that is connected to the source line contact and the well.