IC Testing System Using Voltage Difference for Resistance Measurement
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Solution Overview
Problem
The increasing complexity and performance of integrated circuits (ICs) require effective testing systems to verify functionality, especially for high-density devices with numerous output pins, where existing methods lack accuracy and reliability in measuring resistance and pin functionality.
Innovation Solution
A testing system and method that involves applying two currents to an IC or circuit board, measuring corresponding voltages, and calculating resistance by dividing the voltage difference by the current difference, using a subtractor and divider configuration to derive the total resistance and isolate specific resistances within the circuit, allowing for precise functionality checks without powering the IC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing testing methods are used for high-density ICs with numerous output pins, then testing coverage can be achieved, but measurement precision and reliability of resistance and pin functionality deteriorate
Solution Approach 1:
The testing system segments the measurement process into distinct functional blocks: a subtractor configured to receive first and second voltages and derive their difference, and a divider configured to receive the voltage difference and current difference to calculate resistance. This segmentation allows each block to perform a specific mathematical operation, improving measurement precision for individual resistance calculations in high-density ICs
Solution Approach 2:
The patent introduces intermediary computational blocks (subtractor and divider) that mediate between the raw voltage/current measurements and the final resistance value. These intermediaries process the electrical signals through defined mathematical operations, ensuring accurate resistance measurement even when dealing with numerous pins and complex circuit configurations
2Reliability
If traditional testing methods are used, then comprehensive functionality verification can be attempted, but testing time and cost increase
Solution Approach 1:
The testing method changes the approach by using multiple current levels (first current and second current) to generate corresponding voltages, then deriving resistance through mathematical operations. This parameter-based approach allows comprehensive functionality verification through precise resistance measurements without requiring exhaustive testing of all pin combinations, reducing testing time while maintaining reliability
3Measurement precision
If IC is powered during testing, then functionality can be verified, but testing complexity and potential damage risk increase
Solution Approach 1:
The patent creates a simplified test model by measuring voltages at pins without powering the IC. Instead of testing the fully powered complex system, the method uses external voltage applications and measurements to derive resistance values that indicate pin functionality. This copying approach allows accurate functionality verification while eliminating the risks associated with powering the IC during testing
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 provides higher accuracy and reliability in determining IC and circuit board functionality, reducing testing time and cost by enabling single-pin testing and eliminating the need for powering the IC, while offering precise resistance measurements for diagnosing normal or faulty components.
Implementation Method 1
dividing (i) the difference between the first voltage and the second voltage by (ii) a difference between a first current applied to the circuit and a second current applied to the circuit
Implementation Method 2
derive a resistance of the circuit by dividing (i) the difference between the first voltage and the second voltage by (ii) a difference between a first current applied to the circuit and a second current applied to the circuit
Data Source
AI summary
A testing system includes a subtractor and a divider. The subtractor is configured to receive a first voltage of a circuit being tested and a second voltage of the circuit, and to derive a difference between the first voltage and the second voltage. The divider is configured to receive the difference between the first voltage and the second voltage, and to derive a resistance of the circuit by dividing (i) the difference between the first voltage and the second voltage by (ii) a difference between a first current applied to the circuit and a second current applied to the circuit. The first voltage is corresponding to the first current, and the second voltage is corresponding to the second current.