Opto-Electronic Memory Device with Adjustable Transmittance
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Solution Overview
Problem
Memory devices face challenges in operating both at high speed and low power consumption, with existing architectures either being difficult to scale or unreliable in low power implementations, such as flash memories being slow and SRAMs being hard to scale.
Innovation Solution
The implementation of an opto-electronic memory device using bit cells with an adjustable transmittance component, where a photon detector determines the transmittance state of the component to represent bit values, allowing for both volatile and non-volatile memory operations by altering the transmittance state with electromagnetic stimuli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If flash memory architecture is used, then power consumption is reduced and scalability is improved, but operating speed deteriorates
Solution Approach 1:
The patent introduces a phase change material as an intermediary between the write signal and the storage state. The phase change material transitions between amorphous and crystalline phases to represent binary data, enabling fast writing through localized phase transitions while maintaining low power consumption during read operations. This intermediary mechanism resolves the speed-power contradiction by decoupling the writing and reading processes.
Solution Approach 2:
The patent utilizes phase transitions of the phase change material (from amorphous to crystalline state and vice versa) to store data. The phase change material can be rapidly switched between states using short high-power pulses for writing, while maintaining stable states with minimal power for storage. This phase transition mechanism enables both fast operation and low power consumption by separating the energy-intensive writing phase from the low-power storage phase.
2Speed
If SRAM architecture is used, then operating speed is improved, but scalability deteriorates
Solution Approach 1:
The patent segments the memory cell into distinct functional components: access transistors for control and a phase change material region for storage. This segmentation allows the storage element to be scaled independently from the access logic, enabling better scalability compared to SRAM while maintaining fast access speeds through optimized transistor-phase change material interfaces.
Solution Approach 2:
The patent replaces the mechanical/electrical charge storage mechanism of SRAM with a phase change material-based storage mechanism. This substitution eliminates the need for complex cross-coupled transistor structures required for SRAM stability, simplifying the cell structure and improving scalability while preserving fast write speeds through direct electrical-to-phase transition control.
3Power
If conventional memory architectures are used, then either high speed or low power consumption is achieved, but not both simultaneously
Solution Approach 1:
The patent employs periodic action by using short, intense write pulses to transition the phase change material between states, followed by long periods of stable storage with minimal power consumption. The read operation also uses brief pulse sequences. This periodic pattern of high-power brief actions followed by low-power sustained states enables both fast operation during transitions and low power consumption during storage.
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 enables memory devices to efficiently store and retrieve data with adjustable transmittance states, balancing speed and power consumption while allowing for scalable and reliable operation across different power conditions.
Implementation Method 1
an adjustable transmittance component having an adjustable transmittance state representative of at least a bit value of the bit cell and a photon detector optically coupled to a second side of the adjustable transmittance component
Implementation Method 2
allowing for both volatile and non-volatile memory operations by altering the transmittance state with electromagnetic stimuli
Data Source
AI summary
A memory device includes a bit cell including an adjustable transmittance component having a first side and a second side. The adjustable transmittance component has an adjustable transmittance state representative of a bit value of the bit cell. The memory device further includes a photon detector optically coupled to a second side of the adjustable transmittance component. A technique related to the memory device includes determining a transmittance state of the adjustable transmittance component and providing a bit value for the bit cell based on the transmittance state. Another technique related to the memory device includes determining a bit value to be stored at the bit cell and configuring the adjustable transmittance component to have a transmittance state corresponding to the bit value.