Calibratable Temperature Sensor for MMIC Substrates
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Solution Overview
Problem
Existing methods for monitoring the temperature of microwave monolithic integrated circuits (MMICs) in automotive radar sensors are inadequate, as they cannot be calibrated, leading to unreliable operation due to undefined temperature measurements.
Innovation Solution
A calibratable temperature detection device is integrated on a common substrate with its own power supply and external signal processing, allowing for reliable temperature measurement by determining and storing a linear temperature characteristic during calibration phases when the integrated circuit is powered off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a temperature sensor is integrated on the MMIC substrate, then temperature monitoring capability is improved, but the measurement precision is worsened because the sensor cannot be calibrated when the MMIC is operating
Solution Approach 1:
The patent performs calibration of the temperature sensor during a preliminary phase when the MMIC is switched off, before actual operation begins. This preliminary calibration establishes accurate reference values that enable precise temperature measurement during subsequent operating phases, resolving the contradiction between having continuous monitoring capability and achieving measurement precision.
2Reliability
If the temperature sensor is always active to monitor temperature, then temperature monitoring reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent implements periodic temperature monitoring where the temperature sensor is activated only at specific intervals or under specific conditions rather than continuously. The sensor can be activated during calibration phases, when temperature changes are suspected, or at predetermined time intervals, thereby maintaining monitoring reliability while significantly reducing overall power consumption compared to continuous operation.
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
Enables calibrated temperature measurement of MMICs, ensuring reliable operation by determining the slope and offset of the temperature characteristic, allowing for accurate temperature monitoring without increasing chip temperature during operation.
Implementation Method 1
The temperature sensor always measures a temperature-dependent voltage that corresponds to an undefined temperature
Data Source
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AI summary
The method involves calibrating a temperature detecting device i.e. semiconductor diode (15). A temperature dependence value i.e. linear temperature characteristic (TC), is stored in a storage device (21) by an external signal processing circuit (20). Power supply (12) to an integrated circuit i.e. microwave monolithic integrated circuit (10), is switched on to operate the integrated circuit. Temperature of the integrated circuit in the operating condition is detected by the temperature detecting device based on the temperature dependence value. An independent claim is also included for a device for detecting temperature of an integrated circuit.