Minimum Operating Voltage Determination in IC Testing
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Solution Overview
Problem
Current manufacturing test systems for integrated circuits do not effectively determine the minimum operating voltage at which an integrated circuit can function without failure, especially when operating at a static frequency, and fail to account for variables like power supply noise, leading to inefficiencies in power consumption and heat dissipation.
Innovation Solution
A method and apparatus that involve varying the voltage supplied to a device under test while maintaining a static frequency, using both internal and external test controllers to determine the minimum voltage at which the device operates successfully, and accounting for power supply noise to identify the lowest safe operating voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current manufacturing test systems are used to test integrated circuits, then the testing process can be completed, but the minimum operating voltage cannot be effectively determined and power consumption is not optimized
Solution Approach 1:
The testing system is divided into two independent test controllers: an internal test controller within the DUT that executes built-in self-test programs, and an external test controller that manages test coordination and voltage control. This segmentation allows each controller to specialize in specific testing functions, improving both measurement precision for minimum voltage determination and overall testing productivity through parallel operation.
Solution Approach 2:
The system dynamically varies the power supply voltage as a test parameter while maintaining a static clock frequency. By systematically changing the voltage parameter and observing device response, the system accurately determines the minimum operating voltage. This parameter change approach enables precise measurement while optimizing power consumption at the determined minimum voltage level.
2Use of energy by moving object
If voltage is varied to determine minimum operating voltage, then power consumption can be reduced, but testing complexity increases
Solution Approach 1:
The test system is designed to perform multiple functions: determining minimum operating voltage, testing device functionality at static frequency, and optimizing power consumption. By making the testing apparatus multi-functional, the system avoids requiring separate specialized equipment for each function, thereby reducing overall device complexity while achieving multiple objectives including low power consumption operation.
Solution Approach 2:
The system incorporates feedback mechanisms where test results from the DUT are continuously monitored and fed back to the external test controller. This feedback enables real-time adjustment of test parameters including voltage levels, allowing the system to identify the minimum operating voltage efficiently. The feedback loop ensures accurate measurement while minimizing unnecessary voltage variations, thus reducing power consumption without proportionally increasing testing complexity.
3Measurement precision
If extensive testing over large sampling is performed, then accurate minimum voltage determination is achieved, but testing time increases
Solution Approach 1:
The system performs preliminary characterization of the DUT by executing built-in self-test programs at various voltage levels before final minimum voltage determination. This preliminary action allows the system to quickly identify voltage ranges where the device operates correctly, reducing the need for extensive testing across the entire voltage spectrum. By performing preliminary testing, the system achieves accurate minimum voltage determination with significantly reduced testing time.
Solution Approach 2:
The testing system dynamically adjusts the number and intensity of test samples based on preliminary results. Rather than performing a fixed extensive sampling, the system adapts its testing strategy in real-time, concentrating resources on critical voltage thresholds identified during preliminary tests. This dynamic approach maintains measurement precision for accurate minimum voltage determination while substantially reducing the overall testing duration by avoiding redundant tests in already-characterized voltage ranges.
Data Source
AI summary
In one embodiment, a test system tests a device under test (DUT). The DUT includes an internal test controller that executes built-in self-test (BIST programs. Built-in self-test programs include array-based automatic built-in self-test programs, discrete and combinational logic built-in self-test programs, and functional architecture verification programs (AVPs). An external manufacturing system test controller manages the internal test controller within the DUT and determines minimum operating voltage levels for a power supply input voltage that supplies the DUT. A logic simulator provides a modeling capability to further enhance the development of minimum voltage power supply input operational values for the DUT.