Memory Device Read Voltage Adjustment for Interference Reduction
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Solution Overview
Problem
As memory devices shrink, interference between components such as word lines and memory cells becomes a problem, which existing technologies have not adequately addressed through modifications in materials or spatial arrangements, necessitating a new approach to operation methods.
Innovation Solution
A method for operating a memory device that involves providing a read voltage to an ith word line, a first pass voltage to an adjacent (i+1)th word line, and a second pass voltage to other word lines, where the second pass voltage is lower than the first, to alleviate interference and optimize reading operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If memory devices are shrunk to decrease size, then device size is reduced, but interference between word lines and memory cells increases
Solution Approach 1:
The patent applies parameter changes by adjusting the pass voltage levels applied to different word lines based on their programming state. Programmed word lines receive a first pass voltage while unprogrammed word lines receive a second pass voltage, changing the electrical parameters to differentiate between states and reduce interference in scaled-down devices.
Solution Approach 2:
The patent implements local quality by applying different pass voltages to different word lines based on their individual programming status. Each word line receives a tailored voltage level (first pass voltage for programmed, second pass voltage for unprogrammed), creating localized electrical conditions that minimize interference while maintaining device miniaturization.
2Ease of operation
If pass voltage is applied to all word lines during reading, then reading operation is simplified, but interference between adjacent memory cells increases
Solution Approach 1:
The patent applies local quality by differentiating the pass voltage applied to each word line based on its programming state. Instead of uniform voltage application, programmed word lines receive a first pass voltage while unprogrammed word lines receive a second pass voltage, creating localized electrical environments that reduce adjacent cell interference during read operations.
Solution Approach 2:
The patent implements parameter changes by modifying the pass voltage level according to the programming status of each word line. This dynamic parameter adjustment (first pass voltage for programmed, second for unprogrammed) optimizes the reading process while minimizing harmful interference effects.
Data Source
AI summary
A memory device includes N word lines, wherein the word lines include an ith word line coupled to an ith memory cell and an (i+1)th word line coupled to an (i+1)th memory cell which is disposed adjacent to the ith memory cell and is a programmed memory cell, and i is an integer from 0 to (N−2). A method of operating such a memory device method includes a reading step. In the reading step, a read voltage is provided to the ith word line, a first pass voltage is provided to the (i+1)th word line, and a second pass voltage is provided to the others of the word lines, wherein the second pass voltage is lower than the first pass voltage.