Non-linear Sensor Temperature Compensation Circuit
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Solution Overview
Problem
Existing sensor temperature compensation circuits often rely on linear compensation, which is insufficient for accurately addressing non-linear temperature dependencies in sensor offset and gain, leading to inaccuracies in measurements.
Innovation Solution
A sensor temperature compensation circuit that employs non-linear compensation by summing temperature-dependent offset and gain compensation signals, with their ratios and multipliers adjusted based on temperature, to provide precise correction to the electrical sensor output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If linear temperature compensation is used, then the circuit complexity is reduced, but the measurement precision deteriorates due to inability to address non-linear temperature dependencies
Solution Approach 1:
The temperature compensation is divided into multiple segments: a first temperature compensation signal providing linear compensation and a second temperature compensation signal providing non-linear compensation. These segmented compensation signals are summed to achieve comprehensive temperature compensation, resolving the contradiction between simplicity and precision.
Solution Approach 2:
The patent changes the parameter of temperature compensation from a single linear relationship to a multi-component relationship including both linear and non-linear terms. By introducing temperature-dependent coefficients and non-linear temperature terms, the compensation accuracy is improved while managing circuit complexity through structured implementation.
2Measurement precision
If non-linear temperature compensation is implemented, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The non-linear compensation is segmented into distinct signal paths: one path generates the first (linear) temperature compensation signal and another path generates the second (non-linear) temperature compensation signal. This segmentation allows independent optimization of each compensation component and simplifies the overall circuit design.
Solution Approach 2:
The patent implements dynamic temperature compensation by using temperature-dependent coefficients that vary with temperature. The coefficients are adjusted based on the measured temperature, allowing the compensation circuit to adapt to different temperature conditions and maintain high precision across the operating range.
3Ease of manufacture
If piece-wise linear approximation is used for non-linear compensation, then the implementation is simplified, but the accuracy deteriorates due to strict piece-wise constraints
Solution Approach 1:
The compensation approach is segmented into linear and non-linear components rather than using strict piece-wise linear approximation. This segmentation allows continuous non-linear compensation without the discontinuities and accuracy limitations of piece-wise methods, while maintaining implementation ease through separate signal generation paths.
Solution Approach 2:
The patent changes from fixed piece-wise linear parameters to temperature-dependent continuous parameters. The non-linear temperature compensation signal uses coefficients that continuously vary with temperature, providing smooth and accurate compensation across the entire temperature range without the abrupt transitions inherent in piece-wise approaches.
Data Source
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AI summary
A sensor temperature compensation circuit that includes a sensor and non-linear temperature compensation circuit that compensates for non-linear temperature dependencies in offset and/or gain generated by the sensor. For instance, to at least partially compensate for offset temperature dependencies, a summer adds two offset compensation signals, the ratio of the second to the first being a function of temperature. The summed signal may then be multiplied by a function of temperature. The summed signal may then be used to provide the non-linear temperature compensation to the offset. Alternatively or in addition, to at least partially compensate for gain temperature dependencies, a summer adds two gain compensation signals, the ratio of the second to the first being a function of temperature. The summed signal may then be multiplied by a function of temperature. The summed signal may then be used to provide non-linear temperature compensation to the gain.