Self-Heating Integrated Circuit for Precise Temperature Control
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Solution Overview
Problem
Existing methods for testing integrated circuits at various temperatures are inefficient, as they require a thermal chamber, which can damage test probes and struggle to accurately control the temperature of the integrated circuit, and often involve dedicated heating elements that increase size and cost.
Innovation Solution
A self-heating integrated circuit design that uses existing drive circuits to heat itself to a target temperature through a temperature feedback loop, eliminating the need for a thermal chamber and dedicated heating elements, and allowing for accurate temperature control by converting current into heat using transistors in a half-bridge configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermal chamber is used to heat the integrated circuit, then the integrated circuit can reach target temperature, but the temperature control accuracy deteriorates because the integrated circuit is several degrees off from chamber temperature
Solution Approach 1:
The integrated circuit uses its own internal drive circuits to generate heat and raise its temperature, eliminating the need for external thermal chambers. The circuit self-regulates its temperature by monitoring its own junction temperature through temperature sensing and adjusting the drive current accordingly, achieving accurate temperature control without external equipment.
Solution Approach 2:
A temperature feedback loop is implemented where the integrated circuit continuously monitors its own junction temperature using temperature sensing capabilities and adjusts the drive current to maintain the desired temperature. This closed-loop control ensures accurate temperature control by directly measuring and responding to the actual circuit temperature rather than relying on external chamber temperature.
2Temperature
If a thermal chamber is used for testing, then temperature range can be achieved, but test probes may be damaged by elevated temperatures
Solution Approach 1:
The integrated circuit generates its own heat internally through its drive circuits, eliminating the need for external thermal chambers and test probe exposure to high temperatures. Only the integrated circuit itself reaches elevated temperatures, while the test probes remain at ambient temperature, preserving their durability and reliability.
Solution Approach 2:
The heating function is extracted from the external testing environment and relocated to the integrated circuit itself. The circuit uses its internal power dissipation to generate heat, separating the heating source from the test probes and eliminating thermal exposure of the probes to high temperatures.
3Temperature
If dedicated heating elements are added to the integrated circuit, then temperature control can be achieved, but device size and manufacturing cost increase
Solution Approach 1:
The drive circuits of the integrated circuit are made multi-functional by enabling them to serve both their primary function of driving the load and a secondary function of generating heat for temperature control. This eliminates the need for separate dedicated heating elements, reducing device size and manufacturing cost while maintaining effective temperature control capability.
Solution Approach 2:
The heating function is merged with the existing drive circuits within the integrated circuit. The same transistors and current paths used for normal operation are utilized to generate heat when needed, combining multiple functions into existing structures rather than adding separate heating elements.
4Temperature
If the integrated circuit soaks in a thermal chamber for 30 minutes, then it reaches target temperature, but testing time is increased
Solution Approach 1:
The integrated circuit rapidly self-heats to the target temperature using its internal drive circuits, eliminating the need for prolonged soaking in thermal chambers. The self-heating process achieves temperature equilibrium much faster than passive thermal chamber heating, significantly reducing testing time while maintaining accurate temperature control.
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 reduces capital equipment costs, minimizes probe damage, accelerates setup, and provides precise temperature control, enabling effective testing across a range of temperatures without the need for external heating chambers.
Implementation Method 1
heating the integrated circuit. In one approach, the integrated circuit and test probes for testing the integrated circuit are placed inside a thermal chamber and the thermal chamber is heated to a target temperature
Implementation Method 2
provides precise temperature control, enabling effective testing across a range of temperatures
Data Source
AI summary
Self-heating integrated circuits are provided. In one embodiment, a self-heating integrated circuit comprises a drive circuit configured to drive a device and a controller configured to selectively operate the drive circuit in a first mode or a second mode. In the first mode, the controller is configured to operate the drive circuit to drive the device and, in the second mode, the controller is configured to operate the drive circuit to heat the integrated circuit to a target temperature.