CN110061710A - Highly integrated charge amplifier circuit - Google Patents
Highly integrated charge amplifier circuit Download PDFInfo
- Publication number
- CN110061710A CN110061710A CN201910461483.8A CN201910461483A CN110061710A CN 110061710 A CN110061710 A CN 110061710A CN 201910461483 A CN201910461483 A CN 201910461483A CN 110061710 A CN110061710 A CN 110061710A
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- circuit
- resistance
- operational amplifier
- input terminal
- electrically connected
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/70—Charge amplifiers
Abstract
The invention discloses a kind of highly integrated charge amplifier circuits, it is packaged in the inside of piezoelectric transducer, it is electrically connected with the piezoelectric ceramics of piezoelectric transducer, including printed circuit board, printed circuit board is equipped with impedance inverter circuit, the output end of impedance inverter circuit is electrically connected with ability driving circuit, and quiescent point is connected between impedance inverter circuit and ability driving circuit and clamps down on circuit, the cathode of impedance inverter circuit is also electrically connected with floating ground circuit；Printed circuit board and each circuit are set to the inside of piezoelectric transducer, realize the highly integrated of charge amplifier, under the cooperation of each circuit, realizing becomes the very strong voltage signal of load capacity the charge signal of high internal resistance, greatly improve anti-interference ability, and electronic component dosage is greatly decreased, and will use the sensor cost control of the charge amplifier circuit within hundred yuan, be conducive to piezoelectric transducer promote the use of a large area and the use in Internet of Things building process.
Description
Technical field
The present invention relates to sensor technical fields more particularly to a kind of for handling the highly integrated of sensor detection signal
Charge amplifier circuit.
Background technique
Piezoelectric transducer can independently be generated the wide electric signal of dynamic range, be had using piezo-electric crystal as sensing element
The advantages that small in size, light-weight (being usually no more than 15g), bandwidth, structure be simple, reliable operation.It has been widely applied now
In fields such as the vibration-testing of aviation, ship, bridge and building, signal analysis, vibration calibration, mechanical dynamic experiments.But piezoelectricity
The quantity of electric charge generated after element stress is extremely faint, this brings certain difficulty to being followed by circuit, to measure charge faint in this way
Key be the charge leakage for preventing conducting wire, measuring circuit and acceleration transducer itself.For this purpose, usually the detection of sensor
Signal is first input into the preamplifier of high input impedance, and only under conditions of high input impedance, the input terminal of amplifier is several
It does not shunt, operation current only flows into feedback loop, and leak charge is reduced within limit required by accuracy of measurement.
But traditional charge amplifier design is complicated, expensive, volume is larger, is difficult to integrate, cause sensor with
Have to use cable connection between charge amplifier, and the greatest problem of cable connection is exactly to generate distribution capacity, and generate
Charge leakage.Especially for distance between piezoelectric type roughmeter, these sensors of high speed roundness measuring equipment and wiring board farther out and
It may occur for the instrument of relative motion, sensor wire itself can also generate charge because of friction, make to signal acquisition
At interference, therefore how to avoid charge leakage, sensor wire generation charge is avoided to have an impact signal, becomes raising sensing
Device accuracy of measurement needs the important technological problems solved.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of strong antijamming capability, without charge leakage, height at low cost
The integrated charge amplifier circuit of degree.
In order to solve the above technical problems, the technical scheme is that highly integrated charge amplifier circuit, is packaged in
The inside of piezoelectric transducer is electrically connected with the piezoelectric ceramics of the piezoelectric transducer, including printed circuit board, the printing
Circuit board is equipped with the impedance inverter circuit being electrically connected with the piezoelectric ceramics, the output end electrical connection of the impedance inverter circuit
There is ability driving circuit, is connected with quiescent point between the impedance inverter circuit and the ability driving circuit and clamps down on
Circuit, the cathode of the impedance inverter circuit are also electrically connected with floating ground circuit.
The anode that the printed circuit board is equipped with for being electrically connected the piezoelectric ceramics as a preferred technical solution, is defeated
Enter terminal and negative input terminal, for connecting the high level connection terminal of power supply anode, for output drive signal
Drive output and ground terminal, the impedance inverter circuit are connected to the positive input terminal and the negative input
On son, the output end of the ability driving circuit is electrically connected on drive output；It is described to be electrically connected to floatingly
On the negative input terminal.
The impedance inverter circuit includes operational amplifier U4B, the operational amplifier as a preferred technical solution,
The normal phase input end of U4B is connected to the positive input terminal, and the inverting input terminal of the operational amplifier U4B is connected to described
Negative input terminal, and on the conducting wire between the negative input terminal and the inverting input terminal of the operational amplifier U4B according to
The secondary connecting pin for being serially connected with Low Drift Temperature resistance R1 and Low Drift Temperature resistance R3, the Low Drift Temperature resistance R1 and the Low Drift Temperature resistance R3
Low Drift Temperature resistance R2, the reverse phase of the operational amplifier U4B are connected between the normal phase input end of the operational amplifier U4B
Input terminal is connect with the output end of the operational amplifier U4B, and the positive power source terminal of the operational amplifier U4B is electrically connected to described
The negative power end of high level connection terminal, the operational amplifier U4B is grounded setting.
It is in parallel between the positive power source terminal and the negative power end as a preferred technical solution, to be equipped with capacitor C1 and capacitor
C2。
The ability driving circuit includes operational amplifier U4A, the operational amplifier as a preferred technical solution,
The normal phase input end of U4A is electrically connected to the output end of the operational amplifier U4B, the operational amplifier U4A by capacitor C3
Inverting input terminal be electrically connected to the output end of the operational amplifier U4A, the output end of the operational amplifier U4A with it is described
The connection of drive output, the quiescent point clamp down on circuit connection in the capacitor C3's and operational amplifier U4A
On conducting wire between normal phase input end.
It includes the resistance R5 and resistance being arranged in series that the quiescent point, which clamps down on circuit, as a preferred technical solution,
R6, the resistance R5 other end are connected to the high level connection terminal, the resistance R6 other end ground connection setting, the resistance
The connecting pin of R5 and the resistance R6 are connected with resistance R4 by conducting wire, and the other end of the resistance R4 is connected to institute by conducting wire
It states between capacitor C3 and the normal phase input end of the operational amplifier U4A.
As improvement to above-mentioned technical proposal, the floating ground circuit include be connected to the negative input terminal with it is described
Coupled capacitor E13 between Low Drift Temperature resistance R1, the coupled capacitor E13 ground connection setting.
As improvement to above-mentioned technical proposal, the size of the printed circuit board is less than 6mm × 6mm.
By adopting the above-described technical solution, highly integrated charge amplifier circuit, is packaged in piezoelectric transducer
Inside is electrically connected with the piezoelectric ceramics of the piezoelectric transducer, including printed circuit board, the printed circuit board be equipped with
The impedance inverter circuit of the piezoelectric ceramics electrical connection, the output end of the impedance inverter circuit are electrically connected with high energy power drive electricity
Road is connected with quiescent point and clamps down on circuit, the impedance between the impedance inverter circuit and the ability driving circuit
The cathode of conversion circuit is also electrically connected with floating ground circuit；The beneficial effects of the present invention are: impedance inverter circuit and ability are driven
Circuit integration is moved to printed circuit board, and printed circuit board is set to the inside of piezoelectric transducer, realizes charge amplifier
It is highly integrated, handled by the cooperation of each circuit, realizing becomes the very strong electricity of load capacity the charge signal of high internal resistance
Signal is pressed, anti-interference ability is greatly improved, and electronic component dosage is greatly decreased, the charge amplifier circuit will be used
Sensor cost control is conducive to promoting the use of a large area and in Internet of Things building process for piezoelectric transducer within hundred yuan
Use.
Detailed description of the invention
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein:
Fig. 1 is the integrated morphology schematic diagram of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the embodiment of the present invention；
Fig. 3 is the circuit diagram of floating ground of embodiment of the present invention circuit；
Fig. 4 is the circuit connection diagram of high level of embodiment of the present invention connection terminal and ground terminal.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is further explained.In the following detailed description, only pass through explanation
Mode describes certain exemplary embodiments of the invention.Undoubtedly, those skilled in the art will recognize,
In the case where without departing from the spirit and scope of the present invention, described embodiment can be repaired with a variety of different modes
Just.Therefore, attached drawing and description are regarded as illustrative in nature, and are not intended to limit the scope of the claims.
As depicted in figs. 1 and 2, highly integrated charge amplifier circuit is packaged in the inside of piezoelectric transducer, with institute
The piezoelectric ceramics electrical connection of piezoelectric transducer is stated, including printed circuit board, the printed circuit board are equipped with and the piezoelectricity
The impedance inverter circuit of ceramics electrical connection, the output end of the impedance inverter circuit is electrically connected with ability driving circuit, described
It is connected with quiescent point between impedance inverter circuit and the ability driving circuit and clamps down on circuit, the impedance inverter circuit
Cathode be also electrically connected with floating ground circuit.The size of the embodiment of the present invention printed circuit board is less than 6mm × 6mm, can be used
0.6mm thickness FR4 plate, pad turmeric technique, conducive to the anti-interference ability for improving integrated level and signal.In actual use, originally
Embodiment is integrated in sensor internal, and other filtering parts, end power amplifier part etc. stay on outside line plate, make charge
Amplifier is highly integrated, solves the anti-interference transmission problem of piezo-electric sensor signals.
As shown in Figure 1, the printed circuit board be equipped with for be electrically connected the piezoelectric ceramics positive input terminal and
Negative input terminal, for connecting the high level connection terminal of power supply anode, the driving for output drive signal is exported
Terminal and ground terminal, the impedance inverter circuit are connected on the positive input terminal and the negative input terminal, institute
The output end for stating ability driving circuit is electrically connected on drive output, described to be electrically connected to the cathode floatingly
On input terminal.
As shown in Fig. 2, the impedance inverter circuit includes operational amplifier U4B, the positive of the operational amplifier U4B is defeated
Enter end and be connected to the positive input terminal, the inverting input terminal of the operational amplifier U4B is connected to the negative input
Son, and be sequentially connected in series on the conducting wire between the negative input terminal and the inverting input terminal of the operational amplifier U4B low
The connecting pin of temperature drift resistance R1 and Low Drift Temperature resistance R3, the Low Drift Temperature resistance R1 and the Low Drift Temperature resistance R3 and the operation
Low Drift Temperature resistance R2, the inverting input terminal of the operational amplifier U4B and institute are connected between the normal phase input end of amplifier U4B
The output end connection for stating operational amplifier U4B, forms depth negative voltage feedback, greatly reduces the output impedance of signal, improve
Driving capability.The positive power source terminal of the operational amplifier U4B is electrically connected to the high level connection terminal, the operation amplifier
The negative power end of device U4B is grounded setting.As shown in figure 3, in parallel between the positive power source terminal and the negative power end be equipped with capacitor
The multi-layer ceramic capacitance of 4.7uF can be used in C1 and capacitor C2, the capacitor C1 and the capacitor C2, to guarantee the operation amplifier
The stability of the work of device U4B.
Three Low Drift Temperature resistance and an operational amplifier cooperation realize impedance transformation, wherein the Low Drift Temperature resistance R1
It is 20M Ω using 100K Ω, the Low Drift Temperature precision resistance of 1% precision, the Low Drift Temperature resistance R2, the Low Drift Temperature essence of 1% precision
Cipher telegram resistance, the Low Drift Temperature resistance R3 can be used using 2K Ω, the Low Drift Temperature precision resistance of 1% precision, operational amplifier U4B
The MCP6072-E/MNY of Microchip company production.The impedance inverter circuit of above-mentioned connection type is utilized in piezoelectric transducer
The parasitic capacitance in portion, constitutes a slow discharge circuit, and the presence of the Low Drift Temperature resistance R2 had both avoided the continuous of charge
Accumulation forms voltage error, and eliminates the feedback score capacitor in conventional charge amplifier, so as to avoid because of capacitor itself
Characteristic and the loss problem occurred.Although the conversion of the higher charge signal of this unsuitable frequency of circuit, can meet big
Partial piezoelectric signal especially piezoelectric type roughmeter sensor, high speed roundness measuring equipment sensor and low-frequency shock transducer make
With.
As shown in Fig. 2, the ability driving circuit includes operational amplifier U4A, the positive of the operational amplifier U4A
Input terminal is electrically connected to the output end of the operational amplifier U4B, the anti-phase input of the operational amplifier U4A by capacitor C3
End is electrically connected to the output end of the operational amplifier U4A, the output end of the operational amplifier U4A and the drive output
Son connection, the quiescent point clamp down on circuit connection in the normal phase input end of the capacitor C3 and the operational amplifier U4A
Between conducting wire on, the capacitor C3 use 2.2uF multi-layer ceramic capacitance, other terminals of the operational amplifier U4A with
The connection type of the operational amplifier U4B is similar.The quiescent point clamps down on circuit and the floating ground circuit cooperates, and realizes
Under the premise of single-ended power, the amplification of bipolar signal.
The inverting input terminal of the operational amplifier U4A is electrically connected to the output end of the operational amplifier U4A, is formed deep
Negative-feedback is spent, voltage follow is realized, further improves signal driving capability, reduce the line loss of signal, if be not provided with
This level-one follows, and since the resistance value that the quiescent point clamps down on resistance in circuit is bigger, the equivalent internal resistance of formation also compares
Greatly, signal driving capability will weaken significantly.
Specifically, it includes the resistance R5 being arranged in series and resistance R6, the resistance R5 that the quiescent point, which clamps down on circuit,
The other end is connected to the high level connection terminal, the resistance R6 other end ground connection setting, the resistance R5 and the resistance
The connecting pin of R6 is connected with resistance R4 by conducting wire, and the other end of the resistance R4 is connected to the capacitor C3 and institute by conducting wire
Between the normal phase input end for stating operational amplifier U4A.The resistance R5 and resistance R6 be all made of 10K Ω, 1% precision it is low
Temperature drift precision resistance, the resistance R4 is using 1M Ω, the resistance of 5% precision.The resistance R5 is connected with the resistance R6,
The current potential of tie point is the 1/2 of 3.3V, that is, 1.65V, the tie point are connected with one end of the resistance R4, then described
The other end of resistance R4 is connected to one end of the capacitor C3, and such 1.65V current potential can be coupled to by the resistance R4
On the capacitor C3, the operational amplifier U4A and the operational amplifier U4B, by the Static Electro of two operational amplifiers
1.65V is all clamped down in position, as in quiescent point.The capacitance resistance ware of the present embodiment is put using 0402 or 0201 encapsulation, operation
Big device is encapsulated using TDFN.
As shown in figure 4, the floating ground circuit include be connected to the negative input terminal and the Low Drift Temperature resistance R1 it
Between coupled capacitor E13, the coupled capacitor E13 ground connection setting.The signal cathode PGND of the piezoelectric ceramics is using " floating ground "
Mode, be connected by the capacitor of a 4.7uF with systematically GND, with the quiescent point clamp down on circuit cooperation, realize
The amplification of signal.
The charge amplifier circuit of improvement through this embodiment, formation has the advantage that
1, it is printing electricity on 6mm × 6mm even smaller printed circuit board that entire circuit, which can integrate in an area,
Road plate is fully integratable to inside many piezoelectric transducers.Through the invention by the high internal resistance signal of piezoelectric ceramics in sensor
The voltage signal for being converted to low internal resistance greatly improves the anti-interference ability of signal transmission, avoids charge signal and be transmitted across
It is influenced in journey by cable distributed capacitance, cable length, the friction of cable etc. and generates charge leakage.
2, the circuit uses package dimension as 0402 or 0201 capacitor and resistance, and it is former to form small package patch capacitance-resistance
Part, add preferred operational amplifier, substantially reduce circuit board size, allow circuit and sensor piezoelectric ceramics height
It is integrated.
3, the circuit uses the printed circuit board of 0.6mm plate thickness, and operational amplifier used uses double fortune of TDFN encapsulation
It puts, component is welded after completion, and the total weight of printed circuit board is no more than 0.3g, it is truly realized the miniaturization of circuit board,
Be conducive to highly integrated.
4, this circuit uses the operational amplifier U4B of high input impedance, carries out impedance transformation, and high internal resistance charge signal is turned
It is changed to low internal resistance voltage signal, and using the profound and negative feedbck circuit for utilizing operational amplifier U4A, realizes voltage follow, so that
The driving capability and anti-interference ability of voltage signal further enhance.
5, this circuit uses two divider resistances of resistance R5 and resistance R6, obtains a reference potential, and pass through a resistance
Value is coupled to the non-inverting input terminal of operational amplifier U4A for the resistance R4 of 1M Ω, and to the inverting input terminal of operational amplifier U4B
Voltage clamping is carried out, and since signal ground PGND and power ground GND are by capacity coupled, it is the mode on a kind of " floating ground ",
Therefore the current potential of PGND is substantially 1.65V, this just realized in the case where single supply is powered the conversion of bipolar signal with
Amplification.
6, since this circuit design is more ingenious, operational amplifier is all made of high input impedance, low quiescent current
MCP6072, so that the cost and power consumption of charge amplifier substantially reduce, the cost of conventional charge amplifier is in hundreds of members to thousands of
Member differs, and charge amplifier cost of the invention can be reduced within 10 yuan, in addition after the filtering part of sensor rear end,
It also can control within 30 yuan completely, greatly reduce sensor uses threshold, is conducive to the large area of piezoelectric transducer
It promotes the use of and is used in the building medium and long distance signal acquisition of Internet of Things and transmission.
The above shows and describes the basic principle, main features and advantages of the invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (8)
1. highly integrated charge amplifier circuit is packaged in the inside of piezoelectric transducer, with the piezoelectric transducer
Piezoelectric ceramics electrical connection, including printed circuit board, it is characterised in that: the printed circuit board is equipped with and the piezoelectric ceramics electricity
The impedance inverter circuit of connection, the output end of the impedance inverter circuit are electrically connected with ability driving circuit, and the impedance turns
It changes between circuit and the ability driving circuit and is connected with quiescent point and clamps down on circuit, the cathode of the impedance inverter circuit
Also it is electrically connected with floating ground circuit.
2. highly integrated charge amplifier circuit as described in claim 1, it is characterised in that: set on the printed circuit board
There are the positive input terminal and negative input terminal for being electrically connected the piezoelectric ceramics, for connecting the height of power supply anode
Level connection terminal, drive output and ground terminal, the impedance inverter circuit for output drive signal are connected to
On the positive input terminal and the negative input terminal, the output end of the ability driving circuit is electrically connected to the drive
On dynamic output terminal；It is described to be electrically connected on the negative input terminal floatingly.
3. highly integrated charge amplifier circuit as claimed in claim 2, it is characterised in that: the impedance inverter circuit packet
Operational amplifier U4B is included, the normal phase input end of the operational amplifier U4B is connected to the positive input terminal, the operation
The inverting input terminal of amplifier U4B is connected to the negative input terminal, and the negative input terminal and the operation amplifier
Low Drift Temperature resistance R1 and Low Drift Temperature resistance R3, the Low Drift Temperature have been sequentially connected in series on conducting wire between the inverting input terminal of device U4B
Low temperature is connected between the normal phase input end of the connecting pin and the operational amplifier U4B of resistance R1 and the Low Drift Temperature resistance R3
Resistance R2 is floated, the inverting input terminal of the operational amplifier U4B is connect with the output end of the operational amplifier U4B, the fortune
The positive power source terminal for calculating amplifier U4B is electrically connected to the high level connection terminal, the negative supply termination of the operational amplifier U4B
Ground setting.
4. highly integrated charge amplifier circuit as claimed in claim 3, it is characterised in that: the positive power source terminal with it is described
It is in parallel between negative power end to be equipped with capacitor C1 and capacitor C2.
5. highly integrated charge amplifier circuit as claimed in claim 4, it is characterised in that: the ability driving circuit
Including operational amplifier U4A, the normal phase input end of the operational amplifier U4A is electrically connected to the operation amplifier by capacitor C3
The output end of device U4B, the inverting input terminal of the operational amplifier U4A are electrically connected to the output end of the operational amplifier U4A,
The output end of the operational amplifier U4A is connect with drive output, the quiescent point clamp down on circuit connection in
On conducting wire between the capacitor C3 and the normal phase input end of the operational amplifier U4A.
6. highly integrated charge amplifier circuit as claimed in claim 5, it is characterised in that: the quiescent point is clamped down on
Circuit includes the resistance R5 being arranged in series and resistance R6, and the resistance R5 other end is connected to the high level connection terminal, institute
It states resistance R6 other end ground connection to be arranged, the connecting pin of the resistance R5 and the resistance R6 are connected with resistance R4, institute by conducting wire
The other end for stating resistance R4 is connected between the capacitor C3 and the normal phase input end of the operational amplifier U4A by conducting wire.
7. highly integrated charge amplifier circuit as claimed in claim 4, it is characterised in that: the floating ground circuit includes connecting
The coupled capacitor E13 between the negative input terminal and the Low Drift Temperature resistance R1 is met, the coupled capacitor E13 ground connection sets
It sets.
8. the highly integrated charge amplifier circuit as described in claim 1 to 7 any claim, it is characterised in that: institute
The size for stating printed circuit board is less than 6mm × 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910461483.8A CN110061710A (en) | 2019-05-30 | 2019-05-30 | Highly integrated charge amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910461483.8A CN110061710A (en) | 2019-05-30 | 2019-05-30 | Highly integrated charge amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110061710A true CN110061710A (en) | 2019-07-26 |
Family
ID=67324998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910461483.8A Pending CN110061710A (en) | 2019-05-30 | 2019-05-30 | Highly integrated charge amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110061710A (en) |
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| CN208656723U (en) * | 2018-09-12 | 2019-03-26 | 齐鲁工业大学 | A kind of low-noise charge amplifier for piezoelectric transducer |
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2019
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1551990A (en) * | 2001-09-06 | 2004-12-01 | 住友金属工业株式会社 | Circuit and apparatus for detection of capacitance and microphone device |
| CN201373881Y (en) * | 2009-03-19 | 2009-12-30 | 重庆川仪自动化股份有限公司 | Input signal circuit of signal transmitting meter |
| CN102662095A (en) * | 2012-05-07 | 2012-09-12 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit |
| CN103281042A (en) * | 2013-05-16 | 2013-09-04 | 成都凯天电子股份有限公司 | Remote transmission IEPE type charge amplifier |
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