External Capacitor Discharge Testing for Memory Backup Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Memory devices without internal capacitors for backup power, such as ball grid array (BGA) devices, face challenges in ensuring the functionality of externally located capacitors over their product lifetime, as existing memory devices cannot perform capacitor tests on these capacitors.
Innovation Solution
A capacitor test system that allows for testing externally located capacitors by waiting a time period, increasing discharge time, reading a counter, and determining if the counter value has increased, with the option to repeat the process until the counter value does increase, thereby determining the need for capacitor replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If memory devices use externally located capacitors for backup power, then the device size can be reduced and mechanical robustness improved, but the functionality of these capacitors cannot be tested over the product lifetime
Solution Approach 1:
The patent introduces an intermediary testing system that includes a test device and testing circuitry to bridge the gap between the memory device and external capacitors. This intermediary system enables indirect testing of capacitor functionality through controlled discharge time measurements and counter value comparisons, resolving the reliability assurance problem without compromising the mechanical robustness benefits of external capacitor placement.
Solution Approach 2:
The patent implements a self-service mechanism where the memory device performs its own capacitor testing through integrated testing circuitry and counter-based discharge time measurement. The device uses its existing resources (counter, testing circuitry) to autonomously verify capacitor functionality over time, eliminating the need for external testing equipment while maintaining reliability assurance.
2Reliability
If capacitor testing is implemented for externally located capacitors, then capacitor functionality can be ensured, but board schematics and system complexity would need significant changes
Solution Approach 1:
The patent applies universality by designing a testing system that uses existing multi-functional components within the memory device. The counter and testing circuitry serve dual purposes: normal device operation and capacitor functionality testing. This approach enables reliable capacitor testing without requiring dedicated testing hardware or significant modifications to board schematics, as the system leverages already-present components.
3Reliability
If traditional capacitor testing methods are used, then capacitor functionality can be verified, but noise is injected into low voltage components
Solution Approach 1:
The patent segments the testing process into distinct phases: controlled capacitor discharge, measurement period with counter timing, and result comparison. By separating the high-power discharge event from the low-voltage measurement and processing stages, the system achieves accurate capacitor functionality verification while minimizing noise injection into sensitive low voltage components during the critical measurement window.
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
Ensures the functionality of externally located capacitors without significant changes to board schematics or system cost, reducing noise injection into low voltage components, and ensuring capacitors are functional for the product lifetime.
Implementation Method 1
A capacitor is an electrical component that includes two conducting substances, such as metal plates, separated by a non-conducting substance, such as a dielectric. The capacitor may store energy from a battery while the capacitor is connected to the battery. When the capacitor is disconnected from the battery, current may flow from one metal plate to the other metal plate, which may provide power to a device, such as a memory device that is connected to the capacitor
Data Source
AI summary
Implementations described herein relate to a capacitor test. In some implementations, a system may include a memory device, one or more capacitors located externally to the memory device, and one or more components configured to initiate a capacitor test for the one or more capacitors. The one or more components may be configured to perform an iteration of the capacitor test for the one or more capacitors, wherein performing the iteration of the capacitor test comprises waiting a time period, increasing a discharge time, reading a counter associated with the capacitor test, and determining whether a value of the counter has increased. The one or more components may be configured to perform another iteration of the capacitor test or terminate the capacitor test based on determining whether the value of the counter has increased.