Capacitive Thermal Detection Circuit for Fast Low-Power Sensing
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Solution Overview
Problem
Semiconductor devices face reliability issues due to temperature variations, as existing thermal monitoring systems are inefficient in accurately sensing and managing temperature changes, leading to potential operational failures.
Innovation Solution
A detection circuit comprising a sensing circuit, control circuit, and switching circuit, which generates temperature-dependent voltages to control a capacitor's charging and discharging, allowing for precise temperature measurement by alternately switching between voltage supply and ground, thereby reducing delays and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional thermal monitoring systems are used, then temperature monitoring is provided, but the system suffers from operational delays and high power consumption
Solution Approach 1:
The patent implements periodic action by alternately switching the capacitive element between charging and discharging states through control circuits. The switching circuit toggles between connecting the capacitive element to a voltage source for charging and to ground for discharging, creating periodic charge-discharge cycles that enable continuous temperature monitoring with reduced power consumption compared to continuously active monitoring systems
Solution Approach 2:
The capacitive element serves itself by naturally charging and discharging based on the control signals received, eliminating the need for additional active components during the measurement process. The circuit uses the inherent properties of the capacitive element to perform the temperature sensing function without requiring continuous power supply to active sensing components
2Loss of time
If traditional thermal monitoring systems are used, then temperature monitoring is provided, but operational delays occur in temperature measurement
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitive element to a known voltage state before the actual temperature measurement begins. The control circuit prepares the capacitive element in advance by setting it to a defined initial state, which eliminates startup delays and ensures immediate readiness for accurate temperature measurement when the measurement cycle begins
Solution Approach 2:
The circuit incorporates feedback through control circuits that monitor the voltage across the capacitive element and adjust the charging/discharging cycles accordingly. The control circuits receive feedback signals indicating the current voltage state of the capacitive element and use this information to regulate the switching timing, ensuring that measurements are taken at optimal moments for maximum accuracy while minimizing delays
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 solution enables faster and more accurate temperature sensing and monitoring, reducing operational delays and power consumption compared to traditional systems, ensuring improved reliability of semiconductor devices.
Implementation Method 1
A sensing circuit generates first and second temperature-dependent voltages
Implementation Method 2
A capacitive element generates an output voltage having a voltage level between the first temperature-dependent voltage and the second temperature-dependent voltage
Data Source
AI summary
A circuit is disclosed that includes a capacitive element, a control circuit, and a first switch and a second switch. The capacitive element is configured to generate an output voltage at a terminal thereof. The control circuit is configured to generate a first control signal and a second control signal in response to a first temperature-dependent voltage, a second temperature-dependent voltage, and the output voltage. The first switch and the second switch are coupled to the capacitive element, and configured to be turned on or off in response to the first control signal and the second control signal respectively. The first switch and the second switch have different switching status from each other in a charge mode.