Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for reducing non-linearity during measurement of a physical parameter and electronic circuit for implementing the same

一种物理参数、电子电路的技术,应用在利用改变欧姆电阻的流体压力测量、测量力、测量装置等方向,达到减小非线性效应的效果

Active Publication Date: 2013-01-16
EM MICROELECTRONIC-MARIN
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of steps of the method are necessary to obtain the physical parameter measurement signal on the output, which is a disadvantage
In addition, it does not provide any means of compensating for any non-linearity of the digital-to-analog converter that may introduce measurement errors, which is a disadvantage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for reducing non-linearity during measurement of a physical parameter and electronic circuit for implementing the same
  • Method for reducing non-linearity during measurement of a physical parameter and electronic circuit for implementing the same
  • Method for reducing non-linearity during measurement of a physical parameter and electronic circuit for implementing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Since the various components of sensor electronics interface circuits with differential capacitors are well known in the art, they will not be explained in full detail in the following description. Emphasis is mainly placed on the method of measuring physical parameters by means of an electronic circuit which supplies a digital measurement signal at an output with a reduction of the non-linear effects of the digital-to-analog converter.

[0029] figure 1 A simplified diagram of various components of an electronic interface circuit 1 for a capacitive sensor 2 according to the invention is shown. In this embodiment, a three-axis capacitive MEMS sensor 2 with one mass is connected to the electronic circuit 1 , however, it is entirely conceivable to connect a three-axis sensor or a single-axis sensor with three moving masses. Such a capacitive sensor thus consists of three pairs of capacitors C1X, C2X, C1Y, C2Y, C1Z, C2Z. The two capacitors of each pair are connected diff...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for reducing the non-linearity effect of a digital-analogue converter. An electronic circuit includes an amplifier and a digital-analogue converter for supplying a measuring voltage. The method includes biasing the capacitor electrodes by the measuring voltage on the basis of the first digital signal, then biasing the fixed electrode of the first capacitor at a regulated voltage and the fixed electrode of the second capacitor at a low voltage, then biasing the capacitor electrodes by the measuring voltage on the basis of a second digital measuring signal, and finally biasing the fixed electrode of the first capacitor at a low voltage and the fixed electrode of the second capacitor at a regulated voltage. A defined offset voltage is introduced into the digital-analogue converter to modulate the first and second digital signals. A mean is taken of the two digital signals to reduce the non-linearity effect of the converter.

Description

technical field [0001] The invention relates to a method for reducing non-linear effects of a DAC converter in a control loop during the measurement of a physical parameter by means of a capacitive sensor electronic interface circuit. Physical parameters may relate to acceleration, angular velocity, force or pressure. [0002] The invention also relates to a capacitive sensor electronic interface circuit for implementing a method of reducing the non-linear effects of a DAC converter. Capacitive sensors are constructed with at least two differentially connected capacitors. The common electrode of the capacitors can be moved between the two fixed electrodes under the action of force, for example, in order to change the capacitance value of the respective capacitor. Background technique [0003] In a simple conventional capacitive sensor design, the movable common electrode forms part of an armature that is resiliently held between two fixed electrodes. In this case, the cap...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/241H03M1/12
CPCG01D5/241G01D3/032G01L1/144G01P15/125G01P15/18G01L9/02
Inventor S·格罗斯让A·德希尔德尔
Owner EM MICROELECTRONIC-MARIN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products