Test Vector Frequency Shaping for IC Passband Testing
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Solution Overview
Problem
Integrated circuit devices face challenges in high-speed testing due to passband limitations of communication channels, which cause signal distortion and render test vector patterns unusable, especially when frequency content exceeds the channel's passband, leading to incomplete or inaccurate testing.
Innovation Solution
The method involves generating test vector patterns with reduced frequency content that falls within the passband of the communication channel, allowing for comprehensive testing of integrated circuit devices without reducing transmission rates, by using balanced or unbalanced pulse trains with specific bit patterns and shifting these patterns across multiple passes to ensure thorough testing of memory components and application-specific integrated circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If test vector patterns with high frequency content are transmitted at full processing speed, then testing completeness and speed are improved, but signal distortion occurs when frequency content exceeds the communication channel's passband
Solution Approach 1:
The patent dynamically adjusts the frequency content parameter of test vector patterns based on the measured passband characteristics of the communication channel. By changing the frequency parameter to match the channel's passband limits, the system maintains signal integrity while preserving testing effectiveness at the highest possible speed.
Solution Approach 2:
The testing system incorporates dynamic adaptation by measuring the communication channel's passband characteristics and adjusting test vector frequency content in real-time. This dynamic approach allows the system to optimize testing speed for each specific channel condition rather than using fixed frequency patterns.
2Reliability
If test vector patterns are transmitted at reduced frequency content to match passband requirements, then signal distortion is avoided, but testing completeness may be compromised
Solution Approach 1:
The patent applies partial action by transmitting test vector patterns with frequency content partially reduced to match passband requirements. Rather than completely eliminating high-frequency components, the system reduces them just enough to fit within the passband while maintaining sufficient frequency content to detect high-speed failures.
Solution Approach 2:
The system creates multiple copies of test vector patterns with different frequency content levels. By generating and transmitting multiple versions of test patterns, the system ensures that at least one version will effectively detect failures while maintaining signal integrity, thereby compensating for the partial reduction in frequency content.
3Productivity
If communication channel passband is expanded to support higher frequencies, then full processing speed testing is enabled, but channel complexity and cost increase
Solution Approach 1:
Instead of modifying the communication channel's physical characteristics to expand its passband, the patent changes the parameter of the test vector patterns to match the existing channel capabilities. This approach achieves full processing speed testing by adapting the test signals rather than upgrading the channel infrastructure.
Solution Approach 2:
The patent inverts the conventional approach by not trying to make the channel support higher frequencies, but rather making the test vectors adapt to the channel's frequency limitations. This inversion allows achieving the same testing goals without increasing channel complexity or cost.
Data Source
AI summary
Embodiments of an apparatus and method for high-speed testing of a device under test are described herein, where the device under test is coupled to a tester via a limited passband communication channel. A plurality of test vector patterns is generated having characteristics such that when a given test vector pattern is transmitted electrically at a transmission rate via the communication channel, the test vector pattern has a frequency content that is less than the frequency content of a high frequency test vector pattern if the high frequency test vector pattern were to be transmitted electrically at the transmission rate via the communication channel, and such that the frequency content of each test vector pattern when transmitted electrically at the transmission rate via the communication channel falls within the passband associated with the communication channel.