Magnetoelectronic Logic Circuits for Near-Zero Quiescent Power
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Solution Overview
Problem
Existing digital semiconductor electronics, based on CMOS technology, consume significant power both during operation and in standby mode, leading to high quiescent power dissipation and volatility of logic operations, which limits their efficiency and applicability in low-power and small-form-factor applications.
Innovation Solution
The development of reconfigurable magnetoelectronic devices that operate as passive, nonvolatile logic elements, using magnetic field-controlled avalanche diodes to perform logic operations with minimal quiescent power consumption, allowing for dynamic reconfiguration and reduced footprint, enabling low-power processing and memory functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If CMOS technology is used for digital semiconductor electronics, then logic operations can be performed, but quiescent power dissipation is high
Solution Approach 1:
The patent replaces the conventional CMOS electronic system with a magnetoelectronic system using spin-polarized current and magnetic fields to perform logic operations. This substitution eliminates the need for continuous voltage supply and reduces quiescent power dissipation by utilizing magnetic moment interactions instead of electrical conduction for logic functions
Solution Approach 2:
The invention changes the fundamental operating parameter from voltage-based control in CMOS to magnetic field and spin-polarized current control in magnetoelectronic devices. By using T1 and T2 magnetization parameters to represent logic states instead of voltage levels, the system achieves zero quiescent power dissipation while maintaining logic operation capability
2Area of stationary object
If CMOS FETs are used for logic gates, then Boolean operations can be performed, but device area is large
Solution Approach 1:
The patent merges multiple CMOS FET-based logic gates into a single magnetoelectronic device that can perform the same Boolean operations. The spin valve structure with multiple magnetic layers integrates memory and logic functions in one compact device, reducing the area required for implementing logic gates while maintaining full Boolean operation capability
Solution Approach 2:
The magnetoelectronic device achieves multi-functionality by using different magnetic field configurations and spin-polarized current directions to perform various Boolean operations (AND, OR, NAND, NOR, XOR, XNOR) with a single device structure. This universal approach eliminates the need for multiple specialized gates required in CMOS technology
3Use of energy by moving object
If volatile logic circuits are used, then logic operations can be performed, but power consumption during operation is high
Solution Approach 1:
The patent employs periodic pulsed magnetic fields and spin-polarized current to perform logic operations only when needed, rather than maintaining continuous power supply. The T1 and T2 magnetization states are updated periodically through controlled pulse sequences, reducing operational power consumption while maintaining logic operation stability through the nonvolatile nature of magnetic memory
4Loss of energy
If reconfigurable magnetoelectronic devices are used, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments the magnetoelectronic device into distinct functional layers (spin-polarized current source, magnetic tunnel junctions, magnetic field control lines) that can be independently optimized and controlled. This segmentation allows complex reconfigurable functionality to be achieved through coordinated operation of simpler sub-components, managing overall device complexity while enabling low-power operation
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 approach results in significantly reduced power consumption and increased efficiency, enabling the creation of small, low-power microprocessors and remote independent microsystems suitable for various field applications, including 'smart dust' and biomedical uses, with the ability to perform complex operations without continuous power supply.
Implementation Method 1
a first plurality of magnetic field controlled devices of a first type adapted to store program data and operations data
Implementation Method 2
a second processing circuit that includes one or more second magnetic field controlled device(s) of a second type adapted to perform a first set of operations during an operational mode
Implementation Method 3
using magnetic field-controlled avalanche diodes to perform logic operations
Data Source
AI summary
Magnetoelectronic (ME) logic circuits and methods of operating the same are disclosed for use in energy constrained applications in which logic operations are carried out using a minimal number of physical operations. Microsystems of different circuits made from different types of ME devices can be constructed and employed in applications such as sensors, smart dust, etc. including in clockless applications.