Nanotube Block Memory Elements for High-Density Cross-Point Switches
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Solution Overview
Problem
Current digital logic circuits and memory solutions face challenges in achieving higher densities, faster operation, and lower power consumption, with existing non-volatile memory technologies being volatile and requiring additional circuitry to maintain logical states, which increases complexity and cost.
Innovation Solution
The development of non-volatile memory elements and cross-point switches using nanotube blocks, which include a nanotube element with conductive terminals and control circuitry capable of switching between electronic states, providing a reprogrammable electrical pathway, enabling dense memory arrays and cross-point switch matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If volatile memory technologies are used, then operation speed is improved, but power consumption increases and additional circuitry is required to maintain logical states
Solution Approach 1:
The patent changes the fundamental parameter of memory volatility to non-volatility by using nanotube blocks that inherently maintain their resistance states without power, thereby eliminating the need for continuous power supply and associated refresh circuitry while maintaining operational capability
Solution Approach 2:
The invention extracts and eliminates the volatile memory component and its associated power management circuitry by replacing it with non-volatile nanotube-based memory elements that maintain states without power, thereby reducing overall system complexity and power consumption
2Use of energy by moving object
If non-volatile memory technologies are used, then power consumption is reduced, but device complexity increases due to additional circuitry requirements
Solution Approach 1:
The patent merges the memory storage function with the nanotube block structure itself, where the nanotube block's resistance state directly represents the stored data, eliminating the need for separate volatile memory cells and power management circuitry
Solution Approach 2:
The nanotube block serves multiple functions simultaneously: it acts as both the memory storage element and the logical state representation, while its non-volatile nature inherently provides power management capabilities without requiring additional dedicated circuitry
3Quantity of substance
If memory density is increased, then storage capacity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from planar two-dimensional memory arrays to three-dimensional structures by stacking nanotube blocks vertically, thereby increasing storage capacity without proportionally increasing manufacturing complexity in the lateral dimensions
Solution Approach 2:
The invention segments the memory structure into discrete nanotube blocks that can be independently formed and controlled, allowing for scalable density increases through additional stacking layers rather than requiring proportional increases in lateral fabrication precision
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 solution allows for the creation of high-density, scalable non-volatile memory arrays and cross-point switch matrices that maintain logical states without power, reducing power consumption and complexity, while enabling efficient integration with CMOS circuitry.
Implementation Method 1
the nanotube element is capable of switching between a plurality of electronic states in response to a corresponding plurality of electrical stimuli applied by the control circuitry to the first and second conductive terminals, and wherein, for each different electronic state of the plurality of electronic states, the nanotube element provides an electrical pathway of corresponding different resistance between the first and second conductive terminals
Data Source
AI summary
Under one aspect, a covered nanotube switch includes: (a) a nanotube element including an unaligned plurality of nanotubes, the nanotube element having a top surface, a bottom surface, and side surfaces; (b) first and second terminals in contact with the nanotube element, wherein the first terminal is disposed on and substantially covers the entire top surface of the nanotube element, and wherein the second terminal contacts at least a portion of the bottom surface of the nanotube element; and (c) control circuitry capable of applying electrical stimulus to the first and second terminals. The nanotube element can switch between a plurality of electronic states in response to a corresponding plurality of electrical stimuli applied by the control circuitry to the first and second terminals. For each different electronic state, the nanotube element provides an electrical pathway of different resistance between the first and second terminals.