Detection circuit applied to piezoresistive sensor

Abstract

The invention discloses a detection circuit applied to a piezoresistive sensor. The detection circuit comprises a DC voltage stabilizing circuit, a voltage dividing circuit, a differential amplifyingcircuit and a zero setting circuit, which are sequentially connected, wherein the voltage dividing circuit comprises a first branch and a second bracket connected in parallel with each other, the irstbranch is formed by connecting a first reference resistor and a serial end in series, the second branch is formed by connecting a second reference resistor and a third reference resistor in series, circuits are respectively led out from the first reference resistor and the serial end and between the second reference resistor and the third reference resistor to access the differential amplifying circuit, a potential difference under zero input is eliminated by using the zero setting circuit, meanwhile further smoothing processing is performed on the detection current in combination with the DCvoltage stabilizing circuit, so that the detection result of the piezoresistive sensor is more stable and accurate, meanwhile, the equipment cost of the circuit is also reduced, and the stability ishigher.

Description

Technical field [0001] The invention relates to a sensor-oriented detection circuit, in particular to a detection circuit applied to a piezoresistive sensor. Background technique [0002] The piezoresistive sensor changes some of the performance of the sensor itself by sensing the changes of external physical quantities, and these changes will be output as electrical signals through the conversion element. At present, the traditional test method is to test the potential difference between the two ends of the piezoresistive sensor through the Wheatstone bridge to reflect the changes of the external test environment. This test method will bring large experimental errors, and most of the detected electrical signals are present. There are many unstable factors and many common-mode signals with strong interference, which bring great errors to the experimental results. Summary of the invention [0003] In order to solve the above problems, the present invention provides a detection cir...

AI Technical Summary

Problems solved by technology

At present, the traditional test method is to test the potential difference between the two ends of the piezoresistive sensor through the Wheatstone bridge to reflect the changes in the external test environment. This test method will bring large experimental errors, and most of the detected electrical signals show There are many unstable factors, and there are many common-mode signals with strong interference, which brings a lot of error to the experimental results.

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