Complementary Resistance Switch for Nonvolatile Boolean Logic
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Solution Overview
Problem
Conventional complementary resistance switches face challenges in implementing nonvolatile Boolean functions, particularly in achieving the XNOR and XOR logic operations, and require multiple cycle functions for state setting and reading, which complicates uniform state setting for all logic gates.
Innovation Solution
A complementary resistance switch with antiseries-interconnected bipolar resistors using piezo- or ferroelectric materials with locally different conductivities, where a high voltage sets the structural phase and a low voltage reads the state, allowing for nonvolatile programming and reading of Boolean functions without altering the state during read operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional complementary resistance switches are used to implement nonvolatile Boolean functions, then the basic logic operations can be performed, but the XNOR and XOR operations cannot be achieved and multiple cycle functions are required which complicates the system
Solution Approach 1:
The patent applies local quality by creating modified regions within the piezo- or ferroelectric layer that have different properties from the unmodified regions. Specifically, certain areas of the layer are subjected to modification processes (such as ion implantation or laser treatment) to alter their electrical conductivity and switching characteristics, enabling the realization of XNOR and XOR logic operations that were previously unachievable with uniform conventional structures.
2Reliability
If multiple cycle functions are used for state setting and reading, then all logic gates can have uniform state setting, but the operational complexity and time requirements increase
Solution Approach 1:
The patent implements preliminary action by pre-modifying specific regions of the piezo- or ferroelectric layer during the manufacturing process. These modified regions are prepared in advance with specific electrical properties that enable them to respond differently to applied voltages, allowing logic gates to achieve uniform state setting in a single operational cycle rather than requiring multiple cycles.
3Reliability
If high voltage is applied to set the structural phase, then the Boolean function can be programmed nonvolatilely, but energy consumption increases
Solution Approach 1:
The patent reduces energy consumption by applying local quality principles where only specific modified regions of the piezo- or ferroelectric layer require high voltage for phase setting, while other regions operate at lower voltages. The modified regions are strategically positioned to control the switching behavior, enabling nonvolatile programming with reduced overall energy requirements compared to applying high voltage across the entire layer.
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
Enables efficient nonvolatile programming and reading of Boolean functions, specifically enabling XNOR and XOR operations, with reduced complexity and no need for multiple cycle functions, improving logic gate functionality and operational stability.
Implementation Method 1
the piezo- or ferroelectric layers (11, 11′, 11′′) have different strain-dependent structural phases having different band gaps and/or different polarization charges
Implementation Method 2
Ferroelectric and/or piezoelectric materials, layers or layer systems can have a multiplicity of chemical or physical properties which can be made useable in different areas of application
Implementation Method 3
the surface contacts (S), (Sa) and (Sb) are rectifying and the counter-contacts (O) or (Oa) and (Ob) are non-rectifying
Implementation Method 4
In contrast to piezo- and pyroelectric substances, the electrical polarization in ferroelectrics can be permanently reversed by means of a voltage being applied
Data Source
AI summary
Disclosed is a complementary resistor switch (3) comprising two outer contacts, between which two piezo- or ferroelectric layers (11a and 11b) having an inner common contact are situated. At least one region (11′, 11″) of the layers is modified, either the outer contacts are rectifying (S) and the inner contact is non-rectifying (0), or vice versa, the modified regions are formed at the rectifying contacts, the layers have different strain-dependent structural phases with different band gaps and/or different polarization charges, and the electrical conductivity of the layers is different. Also disclosed are a connectable resistor structure having at least one Schottky contact at two adjoining piezo- or ferroelectric layers, a polycrystalline piezo- or ferroelectric layer comprising modified crystallites, and a method and circuits for encrypting and decrypting a bit sequence.