Thermoelectric Chuck Temperature Control for Faster DUT Stabilization
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Solution Overview
Problem
Existing semiconductor testing systems face inefficiencies in thermal management, leading to delayed thermal response, potential thermal damage, and reduced productivity due to complex cooling processes that lack self-heating or self-cooling capabilities.
Innovation Solution
A semiconductor testing apparatus with dual thermal control mechanisms, incorporating a fast-response thermoelectric module and a slow-response thermal mass head with a heat exchange fluid chamber, along with a guiding mechanism for precise alignment and gas circulation to maintain stable and accurate thermal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a complex cooling system with heat exchanger, thermal mass head, and heater is used to regulate temperature, then temperature control capability is improved, but thermal response time increases and productivity decreases
Solution Approach 1:
The cooling system is segmented into two independent subsystems: a first cooling subsystem with a heat exchanger for slow-response temperature regulation, and a second cooling subsystem with a thermoelectric module for fast-response temperature control. Each subsystem operates independently to address different temporal requirements of temperature management.
Solution Approach 2:
A thermal mass head is introduced as an intermediary component between the two cooling subsystems and the integrated circuit. This thermal mass head receives cooling from both subsystems and distributes the thermal management functions, enabling the fast-response subsystem to quickly adjust temperature while the slow-response subsystem maintains overall thermal stability.
2Temperature
If a multi-step cooling process through heat exchanger, thermal mass head, and heater is implemented, then temperature regulation is improved, but system complexity increases
Solution Approach 1:
The complex cooling process is divided into two separate cooling subsystems, each with its own cooling path and control mechanism. This segmentation simplifies the control logic for each subsystem while maintaining comprehensive temperature regulation capability through their coordinated operation.
Solution Approach 2:
The thermal mass head serves multiple functions: it acts as a heat sink for the first cooling subsystem, a heat source for the second cooling subsystem, and a thermal buffer between the two subsystems. This multi-functionality reduces the need for additional components and simplifies the overall system architecture.
3Device complexity
If the pusher cannot self-heat or self-cool, then mechanical simplicity is maintained, but temperature stabilization time increases and productivity decreases
Solution Approach 1:
The second cooling subsystem incorporates a thermoelectric module with self-heating and self-cooling capabilities. By applying electrical current in different directions, the thermoelectric module can actively pump heat in either direction, enabling the pusher to self-regulate temperature without requiring external heating or cooling mechanisms.
Solution Approach 2:
The system changes the operational parameters of the thermoelectric module by varying the direction and magnitude of electrical current flow. When current flows in one direction, the module cools; when current reverses, the module heats. This parameter change enables rapid adaptation to different thermal conditions and accelerates temperature stabilization.
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
The apparatus ensures rapid and precise temperature adjustments, minimizing thermal gradients and enhancing the reliability and validity of thermal tests by providing stable temperature control and reducing the risk of misalignment during high-speed testing.
Implementation Method 1
a fast-response temperature control system comprising a thermoelectric module that is attached to the thermal mass head
Implementation Method 2
a slow-response temperature control system comprising a thermal mass head that is mounted on the chuck
Implementation Method 3
a heat exchanger configured to cool the heat exchange fluid
Data Source
AI summary
A semiconductor testing apparatus includes: a chuck including a central cavity therethrough; a slow-response temperature control system including a thermal mass head that is mounted on the chuck and overlies the central cavity; a fast-response temperature control system including a thermoelectric module that is attached to the thermal mass head, is positioned within the central cavity, and is configured to be disposed on a device under test (DUT); a printed circuit board (PCB) underlying the chuck; and a test socket mounted on the printed circuit board and containing an array of pogo pins therein.