Hybrid Memory-Dosimeter IC for Radiation Tolerance
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Solution Overview
Problem
Existing data storage apparatuses face challenges in achieving radiation tolerance and accurately monitoring memory wear level, often requiring complex structures or separate devices for dosimetry, which can be cumbersome and inaccurate, especially in large memory arrays.
Innovation Solution
A hybrid data storage apparatus with a single integrated circuit that combines charge-based memory cells for both memory and dosimetry functions, using continuous calibration of the reference current to monitor radiation absorption and adjust for Total Ionizing Dose (TID) through logical read errors, allowing for adaptive and status-aware operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate self-standing blocks are used for dosimetry and memory functions, then radiation tolerance can be achieved, but device complexity increases and integration is reduced
Solution Approach 1:
The patent merges the dosimeter and memory functions into a single integrated circuit. The memory array includes both memory cells and dosimeter cells that share common readout circuitry, control logic, and physical structure. This integration eliminates the need for separate self-standing blocks while maintaining radiation monitoring capabilities, directly resolving the contradiction between radiation tolerance and device complexity.
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: storing data in memory cells, monitoring radiation dose through dosimeter cells, and providing readout operations for both functions through shared circuitry. This multi-functionality approach allows the device to achieve radiation tolerance while reducing overall structure complexity by eliminating redundant components.
2Measurement precision
If a separate dosimeter device is added to monitor radiation wear, then awareness of memory wear level is improved, but device complexity and cost increase
Solution Approach 1:
The dosimeter functionality is merged directly into the memory array structure. Dosimeter cells are integrated alongside memory cells, sharing the same readout circuitry and control mechanisms. This eliminates the need for a separate dosimeter device while maintaining precise wear level monitoring capability.
Solution Approach 2:
The same circuitry and control logic serve dual purposes: reading data from memory cells and measuring radiation dose from dosimeter cells. This universal approach provides accurate wear level awareness without adding separate device complexity or cost.
3Measurement precision
If full scan of memory is performed to assess damage level, then measurement precision is improved, but loss of time and computational complexity increase
Solution Approach 1:
The memory array is segmented into distinct memory cell regions and dosimeter cell regions. The dosimeter cells are specifically designed to monitor radiation damage without requiring scanning of the entire memory array. This segmentation allows damage level assessment through targeted measurement of dosimeter cells only, reducing scan time and computational complexity while maintaining measurement 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 approach enhances radiation tolerance and wear level awareness in a compact, integrated design, reducing computational complexity and cost by using shared circuitry for memory and dosimeter functions, providing accurate TID measurement and improved reliability in harsh environments.
Implementation Method 1
charge-based ones exploiting the intrinsic sensitivity of charge to Total Ionizing Dose (TID)
Data Source
AI summary
A data storage apparatus includes an integrated circuit further including a control unit and a memory array of charge-based memory cells. The memory array includes a first subsection which is operable as a memory, and includes a second subsection which is operable as a dosimeter. The control unit is operable to provide a reference current and to conduct memory access operations to access the memory with reference to the reference current. The control unit is further operable to analyze a statistical distribution of read currents by using memory access operations in the second subsection. Said analysis involves counting of logical read errors of the memory access operations and calibrating the reference current depending on a number of counted logical read errors being indicative also of a Total Ionizing Dose, TID.