Noise Injection System for SSD Power Susceptibility Testing
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Solution Overview
Problem
Current noise injection techniques for power noise susceptibility tests on Solid State Drives (SSDs) face challenges due to the lack of industry standards, varying testing methods, and difficulties in applying high current noise injections, as most noise sources can only drive small capacitive loads, while SSDs require several amperes for testing.
Innovation Solution
A noise injection system comprising a power amplifier and a function generator to deliver voltage boosted noise across a wide frequency range, with a power selector and amplification assembly to adjust noise levels based on frequency, enabling higher noise amplitudes and improved frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional noise sources are used for power noise susceptibility testing, then the testing setup is simple, but the current delivery capability is insufficient (can only drive small capacitive loads, while SSDs require several amperes)
Solution Approach 1:
A power amplifier is introduced as an intermediary device between the function generator and the SSD under test. The function generator produces the noise signal, which is then amplified by the power amplifier to achieve the required several amperes current capability, while the amplifier itself is driven by a controllable power supply. This intermediary solution enables high current delivery without requiring a completely different testing approach.
Solution Approach 2:
The power amplifier serves multiple functions: it amplifies the noise signal from the function generator, delivers high current to the SSD, and its power supply can be controlled to provide different voltage levels. This multi-functionality allows a single device to address both the signal generation and power delivery requirements of the testing system.
2Reliability
If high noise amplitudes are applied across a wide frequency range, then the power noise susceptibility testing effectiveness is improved, but maintaining consistent noise amplitude across frequency becomes difficult
Solution Approach 1:
The system incorporates feedback control where the power amplifier's gain is adjusted based on the frequency of the input signal. The amplifier is designed to maintain a constant output noise amplitude across the frequency range by automatically adjusting its gain characteristics, ensuring consistent testing conditions regardless of the noise frequency being applied.
Solution Approach 2:
The power amplifier's operating parameters are made dynamic rather than fixed. The amplifier adapts its characteristics in real-time based on the input signal frequency, allowing it to maintain consistent output amplitude across different frequencies. This dynamic adjustment capability enables reliable wide-frequency-range testing with uniform noise levels.
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
The solution allows for more effective power noise susceptibility testing of SSDs by maintaining consistent noise amplitude across a broader frequency range, overcoming the limitations of existing methods and enabling higher current delivery for accurate testing.
Implementation Method 1
a power amplifier configured to generate a combined voltage and noise signal for injecting noise into a device under test (DUT); a function generator coupled to the power amplifier to deliver voltage boosted noise
Implementation Method 2
The amplification assembly is configured to receive the first level voltage or the second level voltage based on the frequency level of the frequency select signal, receive and amplify the high frequency noise component when the frequency select signal indicates a high frequency level, and receive and amplify the low frequency noise component when the frequency select signal indicates a low frequency level
Data Source
AI summary
Noise injection systems and methods for conducting power noise susceptibility tests on memory systems, including solid state drives. A noise injection system comprises a power selector to deliver a voltage at a first or second level according to a frequency level indicated by a frequency select signal; a noise signal relay to receive a frequency noise signal and to deliver a low or high frequency noise component of the frequency noise signal according to the frequency level of the frequency select signal; and an amplification assembly, responsive to the frequency select signal and which receives the first or second level voltage based on the frequency level of the frequency select signal, receives and amplifies the high frequency noise component when the frequency select signal indicates a high frequency level, and receives and amplifies the low frequency noise component when the frequency select signal indicates a low frequency level.