Semiconductor Integrated Circuit Signal Loading Compensation
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Solution Overview
Problem
The reliability of test results for multi-chip semiconductor packages is compromised due to timing errors in signal loading, as chips are tested at the wafer level without reflecting signal loading conditions at the multi-chip package level, leading to degraded operational performance.
Innovation Solution
A semiconductor integrated circuit design that includes a signal line and signal loading compensation sections in each chip, allowing for designed signal loading to be applied during testing, mimicking the actual signal loading conditions of the multi-chip package, either through silicon vias or wire bonding, to ensure precise testing at the wafer level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chips are tested at wafer level, then testing efficiency is improved, but test result reliability deteriorates due to timing errors from not reflecting multi-chip package signal loading
Solution Approach 1:
The patent introduces a signal loading compensation section as an intermediary component that simulates the electrical loading effects of other chips in the multi-chip package. This compensation section includes capacitor banks that can be selectively activated to mimic the capacitive loading that would be present when chips are connected in the final package, thereby bridging the gap between isolated wafer-level testing and packaged system behavior without requiring actual package assembly for testing
Solution Approach 2:
The patent dynamically changes electrical parameters during testing by selectively activating or deactivating capacitor banks in the signal loading compensation section. By adjusting the total capacitance value to match different packaging scenarios (wire bonding, through-silicon via, etc.), the test conditions can be transformed to reflect actual operating conditions while maintaining wafer-level testing efficiency
2Reliability
If signal loading compensation is applied during wafer level testing, then test result reliability is improved, but device complexity increases
Solution Approach 1:
The signal loading compensation section is segmented into multiple independent capacitor banks, each representing the loading contribution of a specific chip or interconnection method. This segmentation allows for modular configuration where only the necessary capacitor banks are activated for a given test scenario, reducing the effective complexity during actual testing while maintaining the capability to simulate various packaging configurations
Solution Approach 2:
The signal loading compensation section is designed with universal applicability across different multi-chip packaging methods (wire bonding, through-silicon via, etc.). The same basic structure with configurable capacitor banks can simulate multiple packaging scenarios, eliminating the need for separate testing setups for each packaging type and thereby reducing overall system complexity
Data Source
AI summary
A semiconductor integrated circuit includes a multi-chip package having a plurality of semiconductor chips. The semiconductor integrated circuit includes a signal line; and a signal loading compensation section in a semiconductor chip among the plurality of semiconductor chips, configured to apply a designed signal loading to the signal line in response to activation of a test signal. Here, the designed signal loading has a value corresponding to a signal loading component of another semiconductor chip among the plurality of semiconductor chips to the signal line.