KR101787878B1 - Piezoresistive accelerometer - Google Patents
Piezoresistive accelerometer Download PDFInfo
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- KR101787878B1 KR101787878B1 KR1020160032258A KR20160032258A KR101787878B1 KR 101787878 B1 KR101787878 B1 KR 101787878B1 KR 1020160032258 A KR1020160032258 A KR 1020160032258A KR 20160032258 A KR20160032258 A KR 20160032258A KR 101787878 B1 KR101787878 B1 KR 101787878B1
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- piezoresistor
- piezoresistors
- piezoresistive
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/13—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by measuring the force required to restore a proofmass subjected to inertial forces to a null position
- G01P15/133—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by measuring the force required to restore a proofmass subjected to inertial forces to a null position with piezoelectric counterbalancing means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
- G01L1/183—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material by measuring variations of frequency of vibrating piezo-resistive material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/02—Housings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/13—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by measuring the force required to restore a proofmass subjected to inertial forces to a null position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2420/00—Indexing codes relating to the type of sensors based on the principle of their operation
- B60W2420/22—Strain gauge
- B60W2420/225—Wheatstone bridge circuit
Abstract
A piezoresistive type accelerometer according to an embodiment includes: a support; A mass connected to the support and movable by an external force; A plurality of piezoresistors disposed between the support and the mass and deformed by movement of the mass; And a connection part disposed between the support body and the mass body to enable rotation of the mass body with respect to the support body, wherein the plurality of piezo resistor bodies are stretched or compressed by rotation of the mass body around the connection part, A resistance change can be caused in a plurality of piezoresistors.
Description
More particularly, the present invention relates to a piezoresistive type accelerometer capable of measuring the magnitude of acceleration from a change in resistance due to deformation of a piezoresistive element, and a piezoresistive type accelerometer To a packaging method.
Today, accelerometers are widely used in mobile phones, motion recognition games, building vibration detection, automotive airbags, and military applications. Silicon-based accelerometers have advantages of high integration and miniaturization through mass production through MEMS (micro electro mechanical systems) process, and have advantages of fast response time which is characteristic of semiconductor devices.
For this reason, many researchers in the modern era have been working on the fabrication of accelerometers based on MEMS process and the study of working principles using microstructures. In an accelerometer manufactured through a MEMS process, various principles such as a piezoresistance type, a piezoelectric type, a capacitive type, a resonance type, and an optical type are used. Of these various types of accelerometers, piezo-resistive, piezoelectric, and capacitive types are widely used in industry.
Piezoresistive, piezoelectric, and capacitive accelerometers measure the change in the deformation of a sensing material or the change in spacing of a structure by an external force by converting it into an electrical signal.
Among them, the capacitive type and the piezoelectric type accelerometer have a relatively higher sensitivity than the piezoresistive type. However, in the case of a high impact, there is a problem of non-linearity in the case of a capacitance accelerometer, and a piezoelectric accelerometer has a problem of a zero-shift phenomenon in which the original signal can not be recovered after the shock is detected. Therefore, a piezoresistive type accelerometer is widely used in a high impact environment.
For example, KR 1998-0032658, filed on August 12, 1998, discloses a 'capacitive piezoresistive accelerometer'.
An object of the present invention is to provide a piezoresistive type accelerometer which is suitable for various impact ranges by adjusting the size of a mass and the thickness of a connection portion (hinge), and can be manufactured through dry etching.
An object of the present invention is to provide a piezo-resistive accelerometer which can easily form a Wheatstone bridge circuit, minimizes a structure, increase the degree of integration of the sensor with high stability, and improve productivity.
The object of the present invention is to provide a piezoresistive type accelerometer in which the mass body moves more stably when the impact is applied, and the mass body can move only perfectly in the vertical direction.
An object according to one embodiment is to measure the magnitude of acceleration by increasing or decreasing the resistance of a piezoresistive body and measuring the magnitude of impact when the shell is impacted when used in the military to determine whether the shell explodes And to provide a piezoresistive accelerometer that can be utilized.
According to an aspect of the present invention, there is provided a piezoresistive type accelerometer including: a support; A mass connected to the support and movable by an external force; A plurality of piezoresistors disposed between the support and the mass and deformed by movement of the mass; And a connection part disposed between the support body and the mass body to enable rotation of the mass body with respect to the support body, wherein the plurality of piezo resistor bodies are stretched or compressed by rotation of the mass body around the connection part, A resistance change can be caused in a plurality of piezoresistors.
According to one aspect of the present invention, a plurality of mass bodies are disposed symmetrically with respect to each other with respect to the support, the plurality of mass bodies comprising: a first mass body connected to a first side surface of the support body; And a second mass connected to a second side of the support opposite to the first side of the support, wherein the connection can be disposed on the first side and the second side.
According to one aspect of the present invention, the plurality of piezoresistors may include a first piezoresistive member and a second piezoresistor disposed in a bridge form between the first masses and the first side faces of the upper support member; And a third piezoresistive member and a fourth piezoresistor disposed in a bridge form between the second mass and the second side face of the upper support, wherein the first piezoresistive member, the second piezoresistive member, The resistor and the fourth piezoresistor may form a single Wheatstone bridge circuit.
According to one aspect of the present invention, the first piezoresistive member and the fourth piezoresistive member are arranged symmetrically with each other with the support interposed therebetween, and the second piezoresistive member and the third piezoresistive member are symmetrical .
According to one aspect of the present invention, when the first mass body or the second mass body is moved downward, the first or the fourth resistors are pulled to increase resistance, and the first mass body or the second mass body is moved upward The first piezoresistor or the fourth piezoresistor can be compressed and the resistance can be reduced.
According to one aspect of the present invention, the connecting portion is provided by a hinge, and the connecting portion has a length corresponding to the width of the mass body, and the connecting portion is formed between the center of the first piezoresistive body and the third piezoresistive body, And the fourth piezoelectric resistor.
According to one aspect of the present invention, the support includes a lower support to which the lower surface is bonded to the package substrate; And an upper support disposed on the upper surface of the lower support and connected to the side surface of the mass body, and a lower surface of the mass can be disposed apart from the upper surface of the lower support.
According to one aspect, the plurality of mass bodies may be disposed symmetrically with respect to each other about the upper support, and the plurality of piezo resistors may be arranged symmetrically or asymmetrically with respect to the upper support.
According to an aspect of the present invention, there is provided a piezoresistive type accelerometer including: a support; A plurality of masses connected to the support and movable by an external force; And a plurality of piezoresistors disposed in a bridge form between the support and the plurality of mass bodies and deformed by the movement of the mass body, wherein the plurality of piezo resistors are disposed on the front and back surfaces of the support body .
According to one aspect of the present invention, a plurality of Wheatstone bridge circuits are formed by the plurality of piezoresistors, and the plurality of Wheatstone bridge circuits comprise a first piezoresistor connected between the support and the plurality of mass bodies at the front face of the support, A first Wheatstone bridge circuit composed of a second piezoresistor, a third piezoresistor and a fourth piezoresistor; And a second Wheatstone bridge circuit consisting of a fifth piezoresistor, a sixth piezoresistor, a seventh piezoresistor and an eighth piezoresistor connected between the support and the plurality of masses at the back surface of the support.
According to an aspect of the present invention, there is provided a method of packaging a piezoresistive accelerometer, the method comprising: wire bonding the piezoresistive accelerometer; Applying an adhesive on a package substrate to which the piezoresistive accelerometer is to be bonded; Bonding the piezoresistive accelerometer to the package substrate; Bonding a wire bonded to the piezoresistive accelerometer to the package substrate; And mounting a cap on the piezoresistive accelerometer, wherein the piezoresistive accelerometer and the package substrate are provided with a plurality of electrode pads to correspond to each other.
According to an aspect of the present invention, there is provided a method of packaging a piezoresistive accelerometer, the method comprising: wire bonding the piezoresistive accelerometer to withstand a high impact; Bonding the piezoresistive accelerometer to a metal package; Bonding a wire bonded to the piezoresistive accelerometer to a substrate of the metal package; And a step of bonding a metal cap to the upper part of the metal package by welding, wherein a plurality of electrode pads may be provided on the substrate of the piezoresistive type accelerometer and the metal package, The corresponding wire may be provided to come out of the metal package.
According to the piezoresistive type accelerometer according to the embodiment, by adjusting the size of the mass and the thickness of the connection part (for example, hinge), it is suitable for various impact ranges, and the fabrication process can be simplified by manufacturing through dry etching.
According to the piezoresistive accelerometer according to the embodiment, the whitestone bridge circuit structure is easy, the structure is minimized, the structural stability at high impact is increased, and the degree of integration of the sensor is increased to improve the productivity.
According to the piezometric resistance type accelerometer according to the embodiment, when the impact is applied, the mass body moves more stably and the mass body can move perfectly only in the up and down direction.
According to the piezoresistive accelerometer according to the embodiment, the magnitude of the acceleration is measured by increasing or decreasing the resistance of the piezoresistive body. When the shell is used in the military, the magnitude of the impact when the impact is applied is measured, Or to determine whether the
1 (a) and 1 (b) illustrate a piezoresistive accelerometer according to one embodiment.
2 shows a driving principle of a piezoresistive type accelerometer according to an embodiment.
Fig. 3 shows a Wheatstone bridge circuit formed by a plurality of piezoresistors.
Figure 4 shows the formation of an additional Wheatstone bridge circuit on the back side of the upper support.
5 (a) to 5 (f) show a plurality of photomasks used for manufacturing a piezoresistive accelerometer according to an embodiment.
6 (a) to 6 (f) illustrate a manufacturing process of a piezoresistive type accelerometer according to an embodiment.
7 is an electron micrograph of the manufactured piezoresistive accelerometer.
8 is a flowchart showing a packaging method of a piezoresistive type accelerometer according to an embodiment.
9 (a) to 9 (e) illustrate how the manufactured piezoresistive accelerometer is packaged.
10 is a photograph of a packaging part and a packaging of the manufactured piezoresistive type accelerometer.
Hereinafter, embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments, detailed description of known functions and configurations incorporated herein will be omitted when it may make the best of an understanding clear.
In describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;
FIG. 2 shows a principle of driving a piezoresistive type accelerometer according to an embodiment. FIG. 3 shows the principle of operation of the piezoresistive type accelerometer according to one embodiment. Fig. 4 shows a state in which an additional Wheatstone bridge circuit is formed on the back surface of the upper support. Fig.
1 (a) and 1 (b), a
1 (b) is a cross-sectional view of the
The
At this time, the
However, the shape of the
A plurality of
The
The plurality of
Each of the plurality of
A plurality of
The plurality of
More specifically, the plurality of
The first
The first and third piezoresistors 310 and 340 are disposed symmetrically with respect to each other with the
On the other hand, the plurality of
As the thickness of the
In addition, a connecting
Specifically, the
The connecting
When the external force or impact is applied to the
At this time, when the
Particularly, in the
Although a plurality of
In addition, since the plurality of the
The
2, when a plurality of the
Specifically, when an external impact is applied to the
The lengths of the
On the other hand, when the
When the external impact is transmitted in the opposite direction and the
3, the
At this time, when the voltage V in is applied to the Wheatstone bridge circuit, the output voltage V out can be expressed by the following equation.
On the other hand, assuming that the resistance change value of the
At this time, the change in resistance of the
4, a plurality of
The plurality of
For example, if the
The fifth
Therefore, a first Wheatstone bridge circuit is formed on the front surface of the
The
A piezoresistive type accelerometer according to one embodiment of the present invention has been described, and a method of manufacturing the piezoresistance type accelerometer according to one embodiment will be described below.
As an embodiment, a method of fabricating a silicon on insulator (SOI) wafer in which an oxide film (silicon dioxide) and silicon are sequentially stacked on a silicon substrate is illustrated.
FIGS. 5A to 5F show a plurality of photomasks used for manufacturing a piezoresistive accelerometer according to an embodiment, and FIGS. 6A to 6F are cross- Fig. 7 is an electron micrograph of the manufactured piezoresistive accelerometer. Fig.
5 (a) to 5 (f), a total of five photomasks can be used to fabricate a piezoresistive silicon accelerometer.
Fig. 5 (a) is a photomask which defines a piezoresistive region through ion implantation as a first photomask. 5 (b) is a second photomask, which is an oxide film patterning photomask for defining an Ohmic contact region for electrical contact between the piezoelectric resistor defined by the first photomask and the metal electrode. FIG. 5 (c) is a photomask which defines a metal wiring definition and a wire bonding area through a wet etching process as a third photomask. 5 (d) is a photomask 4 for manufacturing a mass body and a connection portion of the accelerometer by a dry etching process. 5 (e) is a photomask for producing a mass body, a connecting portion, and a plurality of piezoresistors of an accelerometer by a etching process. 5 (f) shows the arrangement of the
6 (a) to 6 (f), a piezoresistive type accelerometer according to an embodiment can be manufactured as follows.
The first step in fabricating the piezoresistive accelerometer is to form a piezoresist.
6 (a) shows an oxide film patterning process to be used as a photomask in the ion implantation process.
First, an oxide film is grown by an oxide film growth process in a furnace. A photoresist pattern is formed through a photolithography process using a
6 (b) shows a process for depositing an oxide film and forming a metal electrode.
First, an oxide film is deposited. Then, the photolithography process is performed using the second photomask, and then the oxide film patterning is performed.
6 (c) and 6 (d) show a metal deposition process and a circuit patterning process for wiring, respectively.
First, aluminum (Al) is deposited.
Thereafter, the photolithography process is performed using the photomask 3. Al is etched using the patterned photoresist as an etch mask.
Meanwhile, the piezoresistive type accelerometer according to an embodiment of the present invention is divided into an upper process for etching the mass body, the bridge type piezoresistive body and the connection portion, and a lower process for etching the connection portion and the support to fabricate the mass body, the bridge type piezoresistor, and the connection portion.
6 (e) shows the etching process of the connecting portion and the support.
The photolithography process is performed with the photomask No. 4, and the photoresist is used as an etching photomask to etch the oxide film and the silicon.
Fig. 6 (f) shows a process for fabricating a bridge type piezoresist, a connection portion and a mass via an upper process.
First, the photolithography process is performed with the
Finally, the dicing process is performed to separate the piezoresistive accelerometer manufactured as a unit.
In addition, a piezoresistive accelerometer manufactured by the method described above with reference to Fig. 7 can be confirmed. 7b) shows a
Hereinafter, packaging of the piezoresistive type accelerometer fabricated as described above will be described.
FIG. 8 is a flowchart showing a packaging method of a piezoresistive accelerometer according to an embodiment. FIGS. 9 (a) to 9 (e) illustrate how the manufactured piezoresistive type accelerometer is packaged, This is a photograph of packaging parts and packaging of a resistive accelerometer.
Referring to FIG. 8, the piezoresistive accelerometer according to one embodiment can be roughly packaged as follows.
First, wire bonding is performed to the piezoresistive accelerometer manufactured as described above (S10), and an adhesive is applied on the package substrate to which the piezoresistive accelerometer is to be bonded (S20). Then, the piezoresistive accelerometer is bonded on the package substrate (S30), and a wire primarily bonded to the piezoresistive accelerometer is secondarily bonded on the package substrate (S40). Then, the cap is mounted on the piezoresistive accelerometer (S50).
Specifically, FIG. 9 (a) shows a state in which the
For such wire bonding, the
Finally, as shown in FIG. 9 (e), after the completion of the secondary wire bonding, an epoxy adhesive is applied to the joint portion between the cap and the
In this regard, FIG. 10A is a package substrate actually made of ceramic board, FIG. 10B is a package substrate provided by ceramic board, FIG. 10C is a view in which a piezoresistive accelerometer is combined on a package substrate, The cap is packaged with a piezoresistive accelerometer coupled to the substrate.
Also, although not specifically shown, a piezoresistive accelerometer according to an embodiment can be roughly packaged as follows.
First, a piezoresistive accelerometer is bonded to the inside of the metal package, and a wire bonded to the piezoresistive accelerometer is bonded on the substrate of the metal package. The metal cap can be attached and welded by welding. At this time, a plurality of electrode pads may be provided to correspond to the substrates of the piezoresistive type accelerometer and the metal package, and electric wires corresponding to the electrode pads may be provided to extend out of the metal package.
Although the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto without departing from the scope of the present invention. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .
10: piezoresistive accelerometer
100: Support
110: Lower support
120: upper support
200: mass
300:
400: Connection
Claims (11)
A mass connected to the support and movable by an external force;
A plurality of piezoresistors disposed between the support and the mass and deformed by movement of the mass; And
A connection disposed between the support and the mass to enable rotation of the mass relative to the support;
Lt; / RTI >
Wherein the plurality of piezoresistors are tensioned or compressed by the rotation of the mass about the connecting portion to cause a resistance change in the plurality of piezoresistors,
A plurality of mass bodies are arranged symmetrically with respect to each other about the support,
Wherein the plurality of mass bodies comprise:
A first mass connected to a first side of the support; And
A second mass connected to a second side of the support opposite the first side of the support;
Lt; / RTI >
And the connection portion is disposed on the first side surface and the second side surface.
The plurality of the piezoresistors may be formed of,
A first piezoresist and a second piezoresistor disposed in a bridge form between the first mass and the first side of the support; And
A third piezoelectric resistor and a fourth piezoelectric resistor disposed in the form of a bridge between the second mass and the second side of the support;
Lt; / RTI >
Wherein the first piezoresistive member, the second piezoresistor, the third piezoresistor, and the fourth piezoresistor form a single Wheatstone bridge circuit.
Wherein the first and the fourth piezoresistors are arranged symmetrically with respect to each other with the support interposed therebetween, and the second piezoresistive element and the third piezoresistor are arranged symmetrically with respect to each other with the support interposed therebetween, Accelerometer.
When the first mass body or the second mass body is moved downward, the resistance of the first or fourth piezo resistor is increased to increase resistance. When the first mass body or the second mass body is moved upward, Wherein the first piezoresistor or the fourth piezoresistor is compressed to reduce the resistance.
The connecting portion is provided with a hinge,
The connecting portion has a length corresponding to the width of the mass body,
And the connecting portion is disposed at the center of the first and second piezoresistors and at the center of the third and fourth piezoresistors.
Wherein the support comprises:
A lower support joined to the lower surface of the package substrate; And
An upper support disposed on the upper surface of the lower support and connected to the side surface of the mass;
Lt; / RTI >
Wherein the lower surface of the mass body is spaced apart from the upper surface of the lower support.
Wherein the plurality of mass bodies are disposed symmetrically with respect to each other about the upper support body, and the plurality of piezo resistors are symmetrically or asymmetrically arranged with respect to the upper support body.
A plurality of masses connected to the support and movable by an external force; And
A plurality of piezoresistors arranged in a bridge between the support and the plurality of mass bodies and deformed by the movement of the masses;
Lt; / RTI >
The plurality of piezoresistors are disposed on the front surface and the back surface of the support,
Wherein the plurality of mass bodies are disposed symmetrically with respect to each other about the support,
Wherein the plurality of mass bodies comprise:
A first mass connected to a first side of the support; And
A second mass connected to a second side of the support opposite the first side of the support;
And an accelerometer.
A plurality of Wheatstone bridge circuits are formed by the plurality of piezoresistors,
Wherein the plurality of Wheatstone bridge circuits comprises:
A first Wheatstone bridge circuit composed of a first piezoresistor, a second piezoresistor, a third piezoresistor and a fourth piezoresistor connected between the support and the plurality of masses in front of the support; And
A second Wheatstone bridge circuit consisting of a fifth piezoresistor, a sixth piezoresistor, a seventh piezoresistor and an eighth piezoresistor connected between the support and the plurality of masses at the backside of the support;
And an accelerometer.
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KR1020160032258A KR101787878B1 (en) | 2016-03-17 | 2016-03-17 | Piezoresistive accelerometer |
PCT/KR2017/000930 WO2017159979A1 (en) | 2016-03-17 | 2017-01-26 | Piezoresistive accelerometer and method for packaging piezoresistive accelerometer |
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KR1020160032258A KR101787878B1 (en) | 2016-03-17 | 2016-03-17 | Piezoresistive accelerometer |
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Yu Xu et al. A Novel Piezoresistive Accelerometer with SPBs to Improve the Tradeoffbetween the Sensitivity and th Resonant Frequency. Sensors. 2016.02.06., Vol.16, No. 2, pp210-214.* |
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