Self-calibration circuit for temperature drift of sensor circuit based on analog multiplier
A sensor circuit and analog multiplier technology, applied in the direction of reducing unwanted effects, can solve the problems of difficult design, high computing power requirements, and dependence on the accuracy and stability of analog computing circuits, so as to achieve simple and universal design strong effect
Active Publication Date: 2021-06-29
安徽见行科技有限公司
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Problems solved by technology
Digital compensation relies on high-precision ADC and requires MCU to process digital signals. In the case of high-speed measurement, the sampling rate of ADC and the computing power of MCU are very high, which increases the cost and complexity of the circuit.
The analog compensation method has many advantages, but it is difficult to design and relies heavily on the accuracy and stability of the analog computing circuit
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[0030] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0031] Such as figure 1 As shown, the present invention provides a self-calibration circuit for sensor circuit temperature drift based on an analog multiplier, and the self-calibration circuit includes: a bridge excitation voltage source 1, a compensation signal acquisition circuit, a sensor circuit and an analog operation circuit; wherein : the analog operation circuit includes: a first differential amplifier 5, a precision resistor 4, an analog multiplier 6 and an analog subtractor 7; the output signal of the compensation signal acquisition circuit is then input into the first differential amplifier 5; The output signal of the sensor circuit is then input int...
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The invention discloses a self-calibration circuit for temperature drift of a sensor circuit based on an analog multiplier, including: a bridge excitation voltage source, a compensation signal acquisition circuit, a sensor circuit and an analog operation circuit; the quasi-operation circuit includes: a first differential amplifier, a precision resistance, analog multiplier and analog subtracter; the output signal of the compensation signal acquisition circuit is input into the first differential amplifier; the output signal of the sensor circuit is input into the analog multiplier and the analog subtracter. The self-calibration circuit overcomes the problem that the analog compensation method in the prior art is difficult to design and relies heavily on the accuracy and stability of the analog operation circuit, so it is difficult to realize a high-precision, high-stability self-calibration circuit.
Description
technical field [0001] The invention relates to the field of bridge signal demodulation circuits for sensors, in particular to a self-correction circuit for sensor circuit temperature drift based on an analog multiplier. Background technique [0002] In many high-precision measurement occasions, the sensor is required to have high temperature stability. There are many sources of temperature drift of the sensor, among which the temperature drift of the signal processing circuit will directly affect the temperature stability of the measurement signal, and the contribution is often not low. The temperature stability of the circuit determines the temperature stability that the sensor can finally achieve. Many sensors used in high-precision measurement systems will be designed with corresponding circuit temperature compensation modules. In practical applications, the temperature distribution of different devices in the sensor circuit is uneven. Devices with high heat generation ...
Claims
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IPC IPC(8): G01D3/028
CPCG01D3/028
Inventor 赵国锋李伟李明夏尹静曹龙轩吴磊冯志华
Owner 安徽见行科技有限公司