Sensor Correction Circuit for Linearizing Non-Linear Voltage Signals
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Solution Overview
Problem
Sensor apparatuses often produce non-linear output voltage signals due to sensor device properties and signal scattering, leading to reduced measuring accuracy when a linear output is required.
Innovation Solution
A correcting circuit comprising a correction current synthesizer, current adjuster, and correction voltage generator is introduced to adjust the output characteristic of the voltage signal, using a voltage-current converting amplifier, square current synthesizing circuit, and current adjusting circuit to generate a correction voltage that linearizes the output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor device is used to detect physical quantities, then the sensor apparatus can output voltage signals corresponding to the detected quantities, but the output characteristic becomes non-linear due to sensor properties and signal scattering
Solution Approach 1:
A correction circuit is introduced as an intermediary component between the sensor device and the output stage. This correction circuit includes a correction current synthesizer, current adjuster, and correction voltage generator that process the sensor output signal and generate a correction voltage to linearize the non-linear output characteristic, thereby improving measurement precision without changing the sensor device itself
2Adaptability or versatility
If the output voltage signal strays greatly from the ideal linear characteristic, then the sensor apparatus can still operate with the sensor device properties, but the measuring accuracy falls
Solution Approach 1:
The correction circuit implements a feedback mechanism where the sensor output voltage signal is fed into the correction current synthesizer, which generates a correction current based on the detected non-linearity. This correction current is then adjusted and converted to a correction voltage that is added to the original signal, creating a closed-loop system that continuously compensates for deviations from ideal linear characteristic
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 improves the measurement accuracy of sensor apparatuses by linearizing the output characteristic of the voltage signal, allowing for more precise detection of physical quantities such as acceleration, pressure, or temperature.
Implementation Method 1
a voltage-current converting amplifier 4 which converts the output voltage signal VB to a current signal
Implementation Method 2
a square current synthesizing circuit 5 which synthesizes a correction current IA having a squared relationship to a current signal I
Implementation Method 3
a correction voltage generator 7 which generates a correction voltage VA for correcting a voltage signal based on the correction current IA
Data Source
AI summary
A correcting circuit includes a correction current synthesizer synthesizing a correction current based on an output signal of a sensor, a current adjuster adjusting a determining current which corresponds to a correction amount based on the correction current, and a correction voltage generator generating a correction voltage for correcting a voltage signal based on the determining current, so as to correct an output characteristic of a voltage signal output in correspondence to the output signal of the sensor.