3D Memory Device Parallel Sense Amplifier Read Speed
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Solution Overview
Problem
The demand for highly integrated memory devices with reduced power consumption has not been adequately met by existing resistive memory devices, which require efficient data sensing operations while maintaining non-volatile characteristics and high speed.
Innovation Solution
A three-dimensional (3D) memory device design featuring a memory cell array with lower and upper memory cells, connected to respective sense amplifiers that perform data sensing operations in parallel, utilizing a stacked semiconductor structure with shared signal lines to enhance read operations and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential data sensing operations are performed on lower and upper memory cells, then device complexity is reduced, but read speed and productivity are worsened
Solution Approach 1:
The patent transitions from sequential sensing operations to parallel operations by utilizing the vertical stacking dimension. Multiple memory cells (lower and upper memory cells) are arranged in different vertical layers and sensed simultaneously through separate sense amplifiers, converting a time-based sequential process into a space-based parallel process, thereby improving read speed without proportionally increasing device complexity
Solution Approach 2:
The sense amplifier is segmented into multiple independent units (first sense amplifier for lower memory cells, second sense amplifier for upper memory cells). Each sense amplifier unit is dedicated to sensing a specific layer's memory cells, allowing independent parallel operations. This segmentation enables simultaneous data reading from multiple memory cells without interference, directly improving productivity
2Productivity
If multiple sense amplifiers perform parallel data sensing operations, then productivity and read speed are improved, but device complexity and manufacturing difficulty are worsened
Solution Approach 1:
The sense amplifier functionality is segmented into multiple independent units, each dedicated to sensing a specific layer's memory cells. This segmentation allows parallel operations while maintaining modular architecture, improving data sensing throughput without creating an unmanageably complex system
Solution Approach 2:
Multiple sense amplifiers share common control mechanisms and operational protocols, allowing them to function as replicated units. This universality reduces the actual complexity increase, as the same design patterns can be reused across different sense amplifier instances, facilitating standardized manufacturing
3Quantity of substance
If 3D stacked memory structure is implemented, then integration density and quantity of memory cells are improved, but device complexity and manufacturing precision requirements are worsened
Solution Approach 1:
Multiple memory cell layers are nested vertically within a compact three-dimensional structure. The lower memory cells and upper memory cells are stacked one above another, sharing common bit lines and control mechanisms. This nesting approach dramatically increases integration density while confining the complexity within a compact footprint
Solution Approach 2:
The patent transitions from planar memory expansion to vertical stacking by utilizing the third dimension (height). Memory cells are arranged in multiple vertical layers rather than expanding horizontally, achieving higher integration density without proportionally increasing the footprint area or manufacturing precision requirements for lateral alignment
4Use of energy by stationary object
If parallel sensing operations are performed on multiple memory cells, then power consumption is reduced, but device complexity and control complexity are worsened
Solution Approach 1:
The control system is segmented into separate control units for different memory layers, with each sense amplifier unit having dedicated control signals. This segmentation allows independent control of parallel sensing operations, reducing the power consumption by enabling selective activation of sense amplifiers while managing control complexity through modular signal management
Solution Approach 2:
Multiple sense amplifiers operate continuously and simultaneously on different memory layers, maintaining productive action without idle time. This continuous parallel operation reduces overall power consumption by eliminating the sequential wait-time energy waste, while control complexity is managed through synchronized control signals that coordinate the continuous operations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables parallel data sensing across multiple memory cells, improving read speed and reducing power consumption in 3D resistive memory devices, addressing the need for efficient and integrated memory solutions.
Implementation Method 1
Memory cells of the resistive memory device may have a resistance distribution according to programmed data. In the operation of reading data stored in the memory cells, data may be sensed by applying a constant current or voltage to a memory cell and reading a voltage that varies according to the resistance of the memory cell.
Data Source
AI summary
A three-dimensional (3D) memory device includes a memory cell array, a first sense amplifier and a second sense amplifier. The memory cell array includes lower memory cells respectively arranged in regions where lower word lines intersect with bit lines and upper memory cells respectively arranged in regions where upper word lines intersect with the bit lines. The first sense amplifier is connected to a first lower word line and performs a data sensing operation on a first lower memory cell connected between a first bit line and the first lower word line. The second sense amplifier is connected to a first upper word line and performs a data sensing operation on a first upper memory cell connected between the first bit line and the first upper word line. The data sensing operations of the first and second sense amplifiers are performed in parallel.