Variable Thermal Conductance Material for Parallel IC Testing
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Solution Overview
Problem
Current thermal testing methods for integrated circuits face limitations in scalability and efficiency, particularly in cooling multiple devices simultaneously, due to complex and unreliable mechanisms for controlling cooling fluid temperature and flow, which hinder manufacturing throughput and test density.
Innovation Solution
The implementation of a system with a variable thermal conductance material layer and a heater layer, combined with a thermal interface material and compression mechanism, allows for independent thermal control of each device under test without altering the cooling structure's temperature, simplifying the control of cooling fluid flow and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual control of cooling fluid flow and temperature is implemented for each integrated circuit under test, then thermal control precision is improved, but device complexity increases prohibitively
Solution Approach 1:
Multiple cooling structures are thermally coupled to a single shared cooling fluid conduit system. This merging approach allows thermal control for multiple integrated circuits through a unified cooling infrastructure, eliminating the need for separate cooling fluid control systems for each device while maintaining individual thermal control capability through the shared conduit network
Solution Approach 2:
The shared cooling fluid conduit system serves multiple functions simultaneously: it provides cooling to multiple different integrated circuits, enables individual thermal control of each device through the shared infrastructure, and maintains system reliability by distributing the cooling function across a universal platform rather than requiring device-specific control mechanisms
2Adaptability or versatility
If chamber-based environmental testing is used, then comprehensive environmental control is improved, but testing rate and throughput deteriorate
Solution Approach 1:
The testing system is segmented into independent test stations, each with its own thermal control capability through the shared cooling conduit system. This segmentation allows multiple devices to be tested simultaneously in parallel rather than requiring sequential testing in a single chamber, thereby increasing throughput while maintaining environmental control versatility
Solution Approach 2:
The system transitions from a single-chamber three-dimensional environmental control approach to a distributed multi-station architecture where thermal control is provided through an extended cooling fluid conduit network. This dimensional expansion allows simultaneous environmental testing of multiple devices across different spatial locations without the throughput limitations of a single chamber
3Temperature
If cooling structures are thermally coupled to integrated circuits under test, then cooling effectiveness is improved, but system size and cost increase
Solution Approach 1:
The cooling structures utilize thin-film thermal coupling interfaces that provide effective thermal contact between the cooling conduit system and the integrated circuits under test. These thin-film interfaces achieve efficient heat transfer while occupying minimal space, avoiding the need for bulky cooling mechanisms while maintaining superior cooling effectiveness
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 enables efficient thermal management for multiple integrated circuits, reducing the need for complex cooling fluid control, enhancing testing density and throughput, and reducing the size, cost, and complexity of the testing apparatus.
Implementation Method 1
a variable thermal conductance material (VTCM) layer disposed on a surface of the cooling structure... the VTCM layer is operable to transfer cooling from the cooling structure to the heater layer
Implementation Method 2
The compression mechanism is for providing compression to the VTCM layer to vary a thermal conductance of the VTCM layer
Implementation Method 3
a heater layer operable to generate heat based on an electronic control
Implementation Method 4
The thermal interface material layer is disposed on the heater layer. The thermal interface material layer is operable to provide thermal coupling and mechanical compliance with respect to the DUT
Data Source
AI summary
An apparatus for thermal control of a device under test (DUT) includes a cooling structure operable to provide cooling, the cooling structure operable to inlet cooling material via an inlet port thereof and operable to outlet cooling material via an outlet port thereof, a variable thermal conductance material (VTCM) layer disposed on a surface of the cooling structure, and a heater layer operable to generate heat based on an electronic control, and wherein the VTCM layer is operable to transfer cooling from the cooling structure to the heater layer. A thermal interface material layer is disposed on the heater layer. The thermal interface material layer is operable to provide thermal coupling and mechanical compliance with respect to the DUT. The apparatus includes a compression mechanism for providing compression to the VTCM layer to vary a thermal conductance of the VTCM layer. The compression mechanism is also for decoupling the VTCM layer from the heater layer.