Thermal Sensor Calibration for Semiconductor Die
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Solution Overview
Problem
Integrated circuits (ICs) face overheating issues due to increased power and complexity, leading to inefficiencies in thermal management, which current methods like fans and duty cycle adjustments often address inadequately, resulting in negative impacts on cost, size, noise, and performance.
Innovation Solution
A thermal detection circuit with adjustable calibration settings, utilizing thermal diodes and a comparator with a push-pull network to generate a trip signal, allowing for precise temperature threshold adjustment and compensation for manufacturing variations, enabling accurate thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal management devices (fans, coolers, duty cycle adjustments) are continuously activated to prevent overheating, then temperature control is maintained, but power consumption increases and performance decreases
Solution Approach 1:
The patent implements preliminary action by performing thermal calibration during manufacturing before the IC is deployed. This pre-calibration establishes accurate thermal characteristics and trip points, enabling the thermal management system to make precise decisions about when cooling is actually needed, rather than continuously activating cooling mechanisms. The calibration data is stored in non-volatile memory and used by the thermal management logic to determine appropriate cooling actions only when temperature thresholds are genuinely exceeded.
2Temperature
If thermal management devices are activated to prevent overheating, then temperature control is maintained, but noise increases
Solution Approach 1:
The patent performs preliminary thermal calibration during manufacturing to establish accurate thermal characteristics and trip points. This pre-calibration enables the thermal management system to precisely determine when cooling is actually necessary, minimizing unnecessary activation of fans and coolers, thereby reducing noise while maintaining effective temperature control.
3Device complexity
If standard thermal sensing is used without calibration, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent implements preliminary action by performing thermal calibration during the manufacturing process. This pre-calibration measures the actual thermal characteristics of each IC and stores calibration data in non-volatile memory. The calibration compensates for manufacturing variations and ensures accurate temperature measurements without requiring complex sensing circuits during operation. The calibrated trip points are stored and used by the thermal management system to make accurate temperature-based decisions.
Solution Approach 2:
The patent applies self-service by having each IC calibrate its own thermal characteristics during manufacturing. The calibration process uses the IC's own internal thermal sensing circuits to measure its specific thermal behavior, and the resulting calibration data is stored in the IC's non-volatile memory. This self-calibration approach eliminates the need for external calibration equipment or complex external sensing circuits, achieving high measurement precision while keeping the device structure relatively simple.
4Manufacturing precision
If thermal calibration is performed for each IC, then manufacturing precision improves, but manufacturing process complexity increases
Solution Approach 1:
The patent applies self-service by having each IC calibrate its own thermal characteristics during the manufacturing process. The calibration uses the IC's internal thermal sensing circuits to measure its specific thermal behavior, and the calibration data is automatically stored in the IC's non-volatile memory. This self-calibration approach achieves high manufacturing precision while avoiding the need for complex external calibration equipment or manual adjustment processes.
Solution Approach 2:
The patent replaces mechanical or manual calibration processes with an automated electrical calibration system. The calibration is performed using electrical measurements through the IC's existing test structures and memory cells, eliminating the need for physical thermal probes, manual adjustments, or complex external equipment. This substitution maintains high calibration accuracy while significantly simplifying the manufacturing process.
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 solution provides precise thermal control, reducing power consumption and noise by accurately activating cooling mechanisms only when necessary, thereby enhancing IC performance and reliability.
Implementation Method 1
one or more thermal diodes generate a voltage that changes with the temperature around it
Data Source
AI summary
A thermal management system is described which may be implemented on a semiconductor die. The system may include a thermal sensor thermally coupled to the die to sense the temperature of the die and generate an output representing the sensed temperature, and an adjustable compensation circuit coupled to the thermal sensor to compensate the thermal sensor output. The adjustable compensation circuit may be applied to the thermal sensor or to a threshold.