Mechanical quantity measurement device and pressure sensor using same
First Claim
1. A mechanical quantity measuring apparatus including:
- a plurality of Wheatstone bridges formed on a main surface of a semiconductor substrate by a plurality of impurity diffusion resistors, andan adder circuit that receives and adds output differential voltage values of the plurality of Wheatstone bridges, whereinthe plurality of impurity diffusion resistors are arranged to be close to each other so that output signal components which are the output differential voltage values of the plurality of Wheatstone bridges increase with approximately equal sensitivities in accordance with an average strain quantity in a region to be measured, anda difference between a strain quantity generated in an x-axial direction and a strain quantity generated in a y-axial direction is detected from the additional result of the adder circuit, the x-axial direction and the y-axial direction being perpendicular to each other on the main surface of the semiconductor substrate.
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Accused Products
Abstract
Provided are a mechanical quantity measurement device having a higher signal-to-noise ratio and resolution than the prior art and a pressure sensor using the same. A mechanical quantity measurement device that is provided with a plurality of Wheatstone bridges on the main surface of a single semiconductor substrate that are composed from impurity-diffused resistors and detect the difference between the strain amount occurring in the x-axis direction and the strain amount occurring in the y-axis direction, which intersect at right angles on the main surface of the semiconductor substrate, said mechanical quantity measurement device being characterized in that the impurity-diffused resistors composing the plurality of Wheatstone bridges are disposed evenly in an area to be measured.
8 Citations
8 Claims
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1. A mechanical quantity measuring apparatus including:
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a plurality of Wheatstone bridges formed on a main surface of a semiconductor substrate by a plurality of impurity diffusion resistors, and an adder circuit that receives and adds output differential voltage values of the plurality of Wheatstone bridges, wherein the plurality of impurity diffusion resistors are arranged to be close to each other so that output signal components which are the output differential voltage values of the plurality of Wheatstone bridges increase with approximately equal sensitivities in accordance with an average strain quantity in a region to be measured, and a difference between a strain quantity generated in an x-axial direction and a strain quantity generated in a y-axial direction is detected from the additional result of the adder circuit, the x-axial direction and the y-axial direction being perpendicular to each other on the main surface of the semiconductor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification