Temperature Sensor Delay Calibration for Process-Independent Output
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Solution Overview
Problem
Conventional one-point calibration of temperature sensitive devices results in larger differences in output signals across devices with different manufacturing process drifts, especially at the extremes of the sensing range, leading to reduced accuracy compared to two-point calibration.
Innovation Solution
A temperature sensitive device is designed with a first delay unit introducing a time delay independent of sensed temperature, a second delay unit introducing a time delay dependent on both manufacturing process and sensed temperature, and a processing unit generating an output signal using an indication signal and reference signal to normalize the output, effectively achieving two-point calibration accuracy with single-point calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one-point calibration is used, then calibration complexity is reduced, but output signal consistency across devices deteriorates
Solution Approach 1:
The patent introduces a delay parameter (time delay) that changes with temperature in a controlled manner. By measuring the change in delay time rather than relying on absolute delay values, the system achieves temperature compensation. The output signal is generated based on the change量 of delay time, which eliminates manufacturing process drift effects while maintaining one-point calibration simplicity.
2Loss of time
If one-point calibration is used, then calibration time is reduced, but measurement precision at temperature extremes deteriorates
Solution Approach 1:
The system uses feedback by measuring the delay time at the current temperature and comparing it with the delay time at the calibration temperature. The output signal is generated based on this feedback comparison, allowing the system to compensate for temperature drift and maintain high measurement precision across the entire temperature range while requiring only one calibration point.
3Ease of manufacture
If manufacturing process drift is present, then device manufacturing ease is improved, but output signal variation increases
Solution Approach 1:
The patent extracts the temperature-dependent component from the total delay time by using a reference delay path. The output signal is generated based on the difference between the delayed signal and the reference signal, effectively removing the manufacturing process drift component while retaining the temperature sensing information. This allows manufacturing flexibility to be maintained while minimizing output signal variation.
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 device achieves output signal consistency across devices with different manufacturing process drifts, mimicking the accuracy of two-point calibration within the sensing range, thereby reducing manufacturing process-dependent variations and enhancing temperature sensing precision.
Implementation Method 1
a first delay unit for receiving an input signal and for introducing a first time delay into the input signal so as to generate a first delayed signal, wherein the first time delay is dependent on a manufacturing process of the temperature sensitive device and is substantially independent of a temperature sensed by the temperature sensitive device
Implementation Method 2
a second delay unit for receiving the input signal and for introducing a second time delay into the input signal so as to generate a second delayed signal, wherein the second time delay is dependent on the manufacturing process of the temperature sensitive device and the temperature sensed by the temperature sensitive device
Implementation Method 3
a difference generating unit electrically coupled to the first delay unit and the second delay unit so as to receive the first delayed signal and the second delayed signal therefrom; the difference generating unit generating an indication signal according to the first delayed signal and the second delayed signal; the indication signal indicating a difference between the first time delay and the second time delay
Data Source
AI summary
A temperature sensitive device includes a first delay unit generating a first delayed signal, a second delay unit generating a second delayed signal, a difference generating unit generating an indication signal according to the first delayed signal and the second delayed signal, and a processing unit generating an output signal that is dependent on the temperature sensed by the temperature sensitive device and substantially independent of the manufacturing process of the temperature sensitive device.