CN108809266A - A kind of charge amplifier circuit - Google Patents
A kind of charge amplifier circuit Download PDFInfo
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- CN108809266A CN108809266A CN201810759735.0A CN201810759735A CN108809266A CN 108809266 A CN108809266 A CN 108809266A CN 201810759735 A CN201810759735 A CN 201810759735A CN 108809266 A CN108809266 A CN 108809266A
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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
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Abstract
The present invention is a kind of charge amplifier circuit, solves the problems such as conventional charge amplifier denoising performance is limited, cost is excessively high.Circuit of the present invention is made of three amplifier chips, three feedback resistances, two filter resistances, two ground resistances, two filter capacitors, seven oval filter capacitors, three oval filter inductances and ground resistance, impedance matching resistor and feedback capacity.Charge amplifier circuit of the present invention uses three-level amplifier enlarged structure, and controllable gain, cutoff frequency and sensitivity, circuit structure is simple, and noise removal capability is strong.In structure, the present invention uses modularization idea, and individual module is made in each channel, optional port number, Portable practical, the real cost made can be far below domestic charge amplifier as needed.
Description
Technical field
The present invention relates to charge amplifier technical field, specifically a kind of charge amplifier circuit based on amplifier LF353.
Background technology
With the rapid development of electronic information science & technology, sensor technology is in fields such as traffic, machinery, electric power
It is widely used.Tremendous development has also been obtained for the signal processing technology of sensor.Many sensors（For example piezoelectricity passes
Sensor, electrostatic transducer etc.）The signal of output belongs to non-electrical physical quantity, and the measurement of non-electrical physical quantity is often related to largely shaking
Dynamic signal.Charge amplifier is exactly such a secondary meter for measuring Vibration Signal in Frequency Domain, it can convert charge signal
For voltage signal, and then for subsequent amplification, processing.
Charge amplifier technology on current international market comparative maturity has approached in performance quasi-static and ultralow
Frequency is horizontal, and noise is almost eliminated, but core technology is still monopolized by a few European countries, and the market price often will
Millions of dollars, although and having charge amplifier product on domestic market（Such as YE5852A type charge amplifiers）, but it have can
Few with channel, volume is big, it is difficult to which the shortcomings of with the system integration, performance is often difficult to meet the requirements, and price is still high.
It can be seen that develop it is a kind of it is of low cost, interactivity is good, circuit is simple, the charge amplifier of Portable practical tool
There is great researching value.
Invention content
The purpose of the present invention is to solve conventional charge amplifier denoising performances it is limited, cost is excessively high the problems such as, and carry
For a kind of charge amplifier circuit.Circuit of the present invention is at the advance signal for the electrostatic signal of gas-particle two-phase streaming system design
Manage electronic instrument.
The present invention is achieved through the following technical solutions：
A kind of charge amplifier circuit, it is characterised in that：Including the first amplifier chip, the second amplifier chip, third amplifier chip,
First feedback resistance, the second feedback resistance, third feedback resistance, ground resistance, impedance matching resistor, the first filter resistance,
Two filter resistances, the first ground resistance, the second ground resistance, feedback capacity, the first filter capacitor, the second filter capacitor, first
Oval filter capacitor, the second oval filter capacitor, third ellipse filter capacitor, the 4th oval filter capacitor, the 5th oval filtering
Capacitance, the 6th oval filter capacitor, the 7th oval filter capacitor, the first oval filter inductance, the second oval filter inductance, third
Oval filter inductance；
Wherein, the first pin of the first amplifier chip connects the first feedback resistance, the first amplifier of another termination of the first feedback resistance
First pin of the second pin of chip, the first amplifier chip connects feedback capacity, another termination the first amplifier core of feedback capacity
Second pin of piece, one end ground connection of the first ground resistance, the third pin of the first amplifier chip of another termination, impedance matching electricity
The first pin, another termination elliptic filter network of one the first amplifier chip of termination of resistance；One termination of the first filter capacitor
First pin of the second amplifier chip, the second filter resistance of another termination, one end ground connection of the second filter capacitor, another termination the
The third pin of two amplifier chips, the first pin of second amplifier chip of termination of the second feedback resistance, another termination second
Second pin of amplifier chip, one end of second filter resistance of termination of the first filter resistance, another termination elliptic filter
One end of network, the third pin of the second amplifier chip of another termination of the second filter resistance, the second ground resistance is grounded, is another
Terminate the second pin of the second amplifier chip, the 7th pin, the other end of a termination third amplifier chip of third feedback resistance
Connect the 6th pin of third amplifier chip, one end ground connection of third ground resistance, another the 6th pipe for terminating third amplifier chip
Foot；Respective corresponding the 8th pin VCC, the 4th pin VEE of first amplifier chip, the second amplifier chip and third amplifier chip
Positive supply+16V and negative supply -16V are met respectively；Signal input is inputted using current source, is directly accessed the of the first amplifier chip
Two pins, small-signal are exported after charge amplifier amplification by the 7th pin of third amplifier chip；
First oval filter capacitor, the second oval filter capacitor, third ellipse filter capacitor, the 4th oval filter capacitor, the 5th
Oval filter capacitor, the 6th oval filter capacitor, the 7th oval filter capacitor, the first oval filter inductance, the second oval filtering
Inductance, third ellipse filter inductance connect and compose the passive elliptic filter of seven ranks；Seven ranks passive elliptic filter volume one end and resistance
Anti- build-out resistor connection, the other end are connect with the first filter resistance.
In charge amplifier circuit of the present invention, the first amplifier chip and the first feedback resistance, the first ground resistance, impedance
Charge amplifying stage is formed with resistance, feedback capacity, realizes charge-voltage conversion；First filtering of the second amplifier chip and periphery
Resistance, the second filter resistance, the first filter capacitor, the second filter capacitor, the second feedback resistance, the second ground resistance form second order
Active low-pass filter filters out partial noise；Third amplifier chip U and the second feedback resistance, third ground resistance constitute normalization
Amplifying circuit, the sensitivity for adjusting amplifier；First oval filter capacitor, the second oval filter capacitor, the filter of third ellipse
Wave capacitance, the 4th oval filter capacitor, the 5th oval filter capacitor, the 6th oval filter capacitor, the 7th oval filter capacitor, the
One oval filter inductance, the second oval filter inductance, third ellipse filter inductance constitute the passive elliptic filter of seven ranks, structure together
At the passive elliptic filter of seven ranks connect with impedance matching resistor, can reach connection prime charge amplifying stage purpose, structure
At the passive elliptic filter of seven ranks connect with the first filter resistance and can reach the second order active low-pass filter of connection rear class
Purpose；The passive elliptic filter of seven ranks constituted can filter out most of noise.
The first amplifier chip, the second amplifier chip, the model of third amplifier chip are double as a preferred technical solution,
Amplifier LF353P, slew rate is higher, performance is stablized；First feedback resistance is 1 M Ω, the second feedback resistance is 160K Ω, third
Feedback resistance is 100 K Ω；First ground resistance is 470 K Ω, the second ground resistance is 17.8 K Ω, third ground resistance is
20 KΩ；Impedance matching resistor is 100 Ω；Feedback capacity is 1000pF；First filter resistance is 2.2 K Ω, the second filtered electrical
Resistance is 15 K Ω；First filter capacitor is 0.01uF, the second filter capacitor is 0.022 uF；First oval filter capacitor is
330nF, the second oval filter capacitor are 680nF, third ellipse filter capacitor is 680nF, the 4th oval filter capacitor is
330nF, the 5th oval filter capacitor are 300nF, the 6th oval filter capacitor is 47nF, the 7th oval filter capacitor is 180nF；
First oval filter inductance is 0.94mH, the second oval filter inductance is 0.94mH, third ellipse filter inductance is 1.14mH.
One, charge amplification principle
Fig. 2 is charge amplifier equivalent circuit diagram, and Ca is electrostatic transducer equivalent capacity in figure, and Cc is connecting cable capacitance, Ci
For the input capacitance of amplifier, Ra is that the insulation leakagel volume leakage of piezoelectric transducer hinders, and Ri is the input impedance of operational amplifier, and Cf is to put
The feedback capacity of big device, Rf is the ohmic leakage for being connected in parallel on feedback capacity both ends.Capacitance negative-feedback is used in charge amplifier, it is right
Dc point is equivalent to open circuit, more sensitive to cable noise, therefore amplifier drift is larger and generates error, to reduce zero
Drift, makes amplifier operation stablize, Rf selects the very high resistance of resistance value (about 1010- 1014Ω), to provide DC feedback.By circuit
Theory can obtain the output voltage of amplifier：
, in practical electricity
The operational amplifier open-loop gain A used in road is about 104-106The order of magnitude, so there is (1+ A) Cf>>Ca+ Cc+ Ci, at this time
Ca, Cc and Ci are negligible, and when Ra, Ri and Rf are quite big, the output voltage of amplifier can be written as：, from above formula it can be found that in the measuring system using charge amplifier, charge is put
The output voltage U of big device0It is directly proportional to charge Q, it is unrelated with cable capacitance Cc, it is also not related with the frequency of signal.
In fact, electrostatic transducer directly converts physical signal to charge signal, but signal is very faint.Therefore, it needs
Corresponding high input impedance voltage or charge amplifier is wanted to carry out charge amplification to the signal that electrostatic transducer element exports.Due to
The sensitivity of voltage amplifier changes with distribution capacity, the piezoelectric transducer selfcapacity of connecting cable, therefore, using charge
Amplifier technique is more.Charge amplifier is worked using Miller effect principle, by feedback capacity on backfeed loop and anti-
Equivalent resistance is presented in input terminal, equivalent capacity is much larger than other parasitic capacitances and conductance with conductance, keeps amplifier sensitivity basic
Only influenced by feedback capacity and feedback resistance.
Two, higher order passive elliptic filter principle
Ideal filtering circuit frequency response is that have maximum amplitude and linear phase shift in passband, and amplitude is zero in stopband.But practical filtering
Circuit is often difficult to reach ideal characterisitics, and it is difficult to realize that amplitude-frequency and phase-frequency response, which are all met the requirements,.It can only basis when design
It needs, seeks best design scheme, obtain the filter of approximate ideal.
Common low-pass filter is had by function category:Butterworth type, Chebyshev type, (Bart is fertile for inverse Chebyshev type
Think of-Chebyshev filter), ellipse (simultaneous Chebyshev filter), Bessel type, Gaussian.Butterworth type passband
It is interior relatively flat, but the decaying in stopband is more slow, it is most weak to the attenuation of out-of-band interference signal；Chebyshev type is logical
There is equal ripples fluctuating in band, cut-off characteristics is especially good, but group delay frequency characteristic is not so good；Attenuation characteristic in inverse Chebyshev type passband
It is flattest, stopband internal characteristic has fluctuating, since cut-off characteristics is poorer than ellipse, so being rarely employed；Ellipse is logical
There is fluctuating in band and stopband, stopband characteristic is all better than other filters, and intermediate zone is precipitous, while very high to requirement on devices；Shellfish
Lag characteristic is the most flat in Sai Er type passbands, and phase characteristic is good, and only cut-off characteristics is mutually on duty；Gaussian cut-off characteristics is not yet
It is good.In contrast, since the frequency converter in the present invention introduces a very noisy, about 300mV, and frequency is relatively fixed,
The ellipse lowpass filter for thus selecting intermediate zone very precipitous herein.
In circuit design, charge amplifier circuit of the present invention uses three-level amplifier enlarged structure, controllable gain, cutoff frequency
Rate and sensitivity, circuit structure is simple, and noise removal capability is strong.
In order to remove very noisy, circuit of the present invention increases higher order passive elliptic filter between charge amplifier grade, choosing
With seven rank filters, calculating is first passed around, obtains theoretical value, then compare with standard series capacitance, inductance, carefully choosing out can
With actually available circuit element, the signal of 10khz or more can be decayed to 50db or more by actual measurement, although Bode diagram
There is a small amount of oscillation, but substantially eliminates noise well while retaining small signal.
Secondly, in charge amplifying stage, amplifying stage uses typical charge amplifier pattern, in order to extract by electrostatic transducer
The faint charge signal of output, needs corresponding high input impedance voltage or charge amplifier to export electrostatic transducer element
Signal carries out charge amplification.The design of charge amplifying circuit makes the easy to adjust and quick of whole bandwidth.And pass through feedback
It holds and connects different size of resistance addition direct current negative-feedback, different capacitance sizes and knob are connected together, and realize that bandwidth is controllable.
When a sensor is replaced, for same vibratory output because the sensitivity of piezoelectric acceleration sensor is different, sensor is defeated
The quantity of electric charge gone out is different, this differs the voltage value for causing charge amplifier to export.In view of the practicability of circuit and general
Property, meter of the present invention third level operational amplifier circuit is as normalization amplifying circuit.The effect of normalization amplifying circuit is added when tested
One timing of speed, when going to measure with the different sensor of sensitivity, output result ensures unanimously, that is, to correspond to unit acceleration,
Different sensors correspond to the same voltage of the output phase in charge amplifier output end.The big of feedback resistance is controlled by slide rheostat
It is small, it realizes the fine tuning of gain, when to ensure that the sensor with two different sensitivities removes the acceleration measured, is put in normalizing
Big circuit obtains equal output, reaches normalized purpose.
In structure, the present invention uses modularization idea, and individual module is made in each channel, can be appointed as needed
Port number is selected, Portable practical, the real cost made is far below domestic charge amplifier.
Charge amplifier circuit of the present invention, cutoff frequency 7kHz, relief volume is 0.1dB in passband, and stop-band frequency is
10kHz, minimum stop-band attenuation herein are -50dB, meet index, and characteristic impedance is 50 ohm.
Description of the drawings
Attached drawing herein is used for providing the further explanation to the present invention, constitutes part of this application, of the invention shows
Meaning property embodiment and its explanation are used for explaining the present invention, not constitute improper limitations of the present invention.
Fig. 1 is circuit diagram of the present invention.
Fig. 2 is charge amplifier equivalent circuit diagram.
Fig. 3 is the characterization source input waveform figure that oscillograph one is shown.
Fig. 4 is the display of oscillograph two by the amplified oscillogram of charge.
Fig. 5 be oscillograph three show it is filtered after oscillogram.
Fig. 6 is the display of oscillograph four by normalizing amplified oscillogram.
Fig. 7 is filter Bode diagram amplitude versus frequency characte figure.
In figure：The first amplifier chips of 1-, the second amplifier chips of 2-, 3- thirds amplifier chip, the first feedback resistances of 4-, 5-
Two feedback resistances, 6- thirds feedback resistance, the first ground resistances of 7-, 8- impedance matching resistors, the first filter resistances of 9-, 10-
Two filter resistances, the second ground resistances of 11-, 12- thirds ground resistance, 13- feedback capacities, the first filter capacitors of 14-, 15-
The oval filter capacitor of two filter capacitors, 16- first, the oval filter capacitors of 17- second, 18- third ellipses filter capacitor, 19- the
The oval filter capacitor of four oval filter capacitors, 20- the 5th, the oval filter capacitors of 21- the 6th, the oval filter capacitors of 22- the 7th,
The oval filter inductances of 23- first, the oval filter inductances of 24- second, 25- third ellipse filter inductances.
Specific implementation mode
In order to make those skilled in the art be better understood from the present invention, below in conjunction with refer to the attached drawing and in conjunction with the embodiments to this
Further clear, complete explanation is made in invention.It should be noted that in the absence of conflict, embodiment in the application and
Feature in embodiment can be combined with each other.
As shown in Figure 1, a kind of charge amplifier circuit, including the first amplifier chip 1, the second amplifier chip 2, third amplifier
Chip 3, the first feedback resistance 4, the second feedback resistance 5, third feedback resistance 6, the first ground resistance 7, impedance matching resistor 8,
First filter resistance 9, the second filter resistance 10, the second ground resistance 11, third ground resistance 12, feedback capacity 13, first are filtered
Wave capacitance 14, second the 16, second oval filter capacitor 17 of the 15, first oval filter capacitor of filter capacitor, third ellipse filtered electrical
Hold the 21, the 7th oval filtered electrical of the 20, the 6th oval filter capacitor of the 19, the 5th oval filter capacitor of the 18, the 4th oval filter capacitor
Hold 22, first the 23, second oval filter inductance 24 of oval filter inductance, third ellipse filter inductance 25；
Wherein, the first pin of the first amplifier chip 1 connects the first feedback resistance 4, and another termination first of the first feedback resistance 4 is transported
The second pin of chip 1 is put, the first pin of the first amplifier chip 1 connects feedback capacity 13, another termination of feedback capacity 13
Second pin of one amplifier chip 1, one end ground connection of the first ground resistance 7, the third pipe of the first amplifier chip 1 of another termination
Foot, the first pin, another termination elliptic filter network of first amplifier chip 1 of termination of impedance matching resistor 8；First filter
The first pin, the second filter resistance 10 of another termination of one the second amplifier chip 2 of termination of wave capacitance 14, the second filter capacitor 15
One end ground connection, it is another termination the second amplifier chip 2 third pin, the second feedback resistance 5 one termination the second amplifier chip 2
The first pin, it is another termination the second amplifier chip 2 the second pin, the first filter resistance 9 one termination the second filter resistance
10 one end, another termination elliptic filter network, the third pipe of the second amplifier chip of another termination 2 of the second filter resistance 10
Foot, one end ground connection of the second ground resistance 11, the second pin of the second amplifier chip 2 of another termination, the one of third feedback resistance 6
The 7th pin of third amplifier chip 3, the 6th pin of another termination third amplifier chip 3 are terminated, third ground resistance 12
One end ground connection, another the 6th pin for terminating third amplifier chip 3；First amplifier chip 1, the second amplifier chip 2 and third fortune
It puts chip 3 respective corresponding the 8th pin VCC, the 4th pin VEE and meets positive supply+16V and negative supply -16V respectively；Signal is defeated
Enter and inputted using current source, be directly accessed the second pin of the first amplifier chip 1, small-signal by charge amplifier amplify with
Afterwards, it is exported by the 7th pin of third amplifier chip 3；
First the 16, second oval filter capacitor 17 of oval filter capacitor, the oval filter capacitor of third ellipse filter capacitor the 18, the 4th
19, the 21, the 7th the 22, first oval filter inductance of oval filter capacitor of the 20, the 6th oval filter capacitor of the 5th oval filter capacitor
23, the second oval filter inductance 24, third ellipse filter inductance 25 connect and compose the passive elliptic filter of seven ranks；Seven ranks are passive ellipse
Filter volume one end is connect circle with impedance matching resistor 8, the other end is connect with the first filter resistance 9.
In above-mentioned charge amplifier circuit, the first amplifier chip 1, the second amplifier chip 2, the model of third amplifier chip 3
It is double operational LF353P；First feedback resistance 4 is 1 M Ω, the second feedback resistance 5 is 160K Ω, third feedback resistance 6 is
100 KΩ；First ground resistance 7 is 470 K Ω, the second ground resistance 11 is 17.8 K Ω, third ground resistance 12 is 20 K
Ω；Impedance matching resistor 8 is 100 Ω；Feedback capacity 13 is 1000pF；First filter resistance 9 is 2.2 K Ω, the second filtered electrical
Resistance 10 is 15 K Ω；First filter capacitor 14 is 0.01uF, the second filter capacitor 15 is 0.022 uF；First oval filter capacitor
16 be 330nF, the second oval filter capacitor 17 is 680nF, third ellipse filter capacitor 18 is 680nF, the 4th oval filtered electrical
Appearance 19 is 330nF, the 5th oval filter capacitor 20 is 300nF, the 6th oval filter capacitor 21 is 47nF, the 7th oval filtered electrical
It is 180nF to hold 22；First oval filter inductance 23 is 0.94mH, the second oval filter inductance 24 is 0.94mH, the filter of third ellipse
Wave inductance 25 is 1.14mH.
For the faint charge signal that electrostatic transducer in extraction two-phase flow system exports, the present invention has studied tradition in detail
The design scheme of charge amplifier, and the characteristics of electrostatic transducer output signal is analyzed.And then use NI companies
Multisim simulation softwares are emulated and have been optimized to traditional amplifier, are finally carried out to the signal of electrostatic transducer output
Charge amplification test finds that charge amplifier maximum can convert the charge signal of 1uA and be enlarged into the voltage of mV more than 900 and believe
Number, bandwidth is up to 0.1Hz-10kHz.
Charge amplifier circuit of the present invention obtains following by test as a result, Fig. 3 is that the characterization source that oscillograph one is shown is defeated
Enter waveform, represent input voltage, it is seen that its amplitude is very faint, and voltage peak-to-peak value only has 1.93uv；Fig. 4 shows for oscillograph two
Pass through the amplified waveform of charge, represent the voltage after charge amplifying stage, it is seen that its amplitude reaches 199.507mv；Fig. 5 is to show
Wave device three show it is filtered after waveform, represent the voltage after second-order low-pass filter, it is seen that its amplitude reaches
198.480mv；Fig. 6 is passing through for the display of oscillograph four to normalize amplified waveform, represents and normalizes amplified voltage, can
See that its amplitude reaches 11.92V, reaches by a relatively large margin；Amplify by the three-level of circuit of the present invention it can be seen from Fig. 3 to Fig. 6
Afterwards, waveforms at different levels are not distorted substantially, and reach 11.92V by a relatively large margin, and amplifier emulation is extremely successful.
Fig. 7 is filter Bode diagram amplitude versus frequency characte figure, is tested by Bode diagram instrument it is found that near 10kHz, original input is believed
Number 300mv decaying is less than 1mv, and ensure that original signal is constant, has achieved the effect that denoising.
The above is that technical solution in the embodiment of the present invention is clearly and completely described, described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
All other embodiment that art personnel are obtained without creative efforts belongs to the model that the present invention protects
It encloses.
Claims (2)
1. a kind of charge amplifier circuit, it is characterised in that：Including the first amplifier chip（1）, the second amplifier chip（2）, third
Amplifier chip（3）, the first feedback resistance（4）, the second feedback resistance（5）, third feedback resistance（6）, the first ground resistance（7）,
Impedance matching resistor（8）, the first filter resistance（9）, the second filter resistance（10）, the second ground resistance（11）, third ground connection electricity
Resistance（12）, feedback capacity（13）, the first filter capacitor（14）, the second filter capacitor（15）, the first oval filter capacitor（16）,
Two oval filter capacitors（17）, third ellipse filter capacitor（18）, the 4th oval filter capacitor（19）, the 5th oval filter capacitor
（20）, the 6th oval filter capacitor（21）, the 7th oval filter capacitor（22）, the first oval filter inductance（23）, it is second oval
Filter inductance（24）, third ellipse filter inductance（25）；
Wherein, the first amplifier chip（1）The first pin connect the first feedback resistance（4）, the first feedback resistance（4）Another termination
First amplifier chip（1）The second pin, the first amplifier chip（1）The first pin connect feedback capacity（13）, feedback capacity
（13）The first amplifier chip of another termination（1）The second pin, the first ground resistance（7）One end ground connection, another termination the
One amplifier chip（1）Third pin, impedance matching resistor（8）One termination the first amplifier chip（1）The first pin, another
Terminate elliptic filter network；First filter capacitor（14）One termination the second amplifier chip（2）The first pin, another termination
Second filter resistance（10）, the second filter capacitor（15）One end ground connection, the second amplifier chip of another termination（2）Third pipe
Foot, the second feedback resistance（5）One termination the second amplifier chip（2）The first pin, the second amplifier chip of another termination（2）'s
Second pin, the first filter resistance（9）One termination the second filter resistance（10）One end, another termination elliptic filter net
Network, the second filter resistance（10）The second amplifier chip of another termination（2）Third pin, the second ground resistance（11）One end
Ground connection, the second amplifier chip of another termination（2）The second pin, third feedback resistance（6）One termination third amplifier chip（3）
The 7th pin, another termination third amplifier chip（3）The 6th pin, third ground resistance（12）One end ground connection, it is another
Terminate third amplifier chip（3）The 6th pin；First amplifier chip（1）, the second amplifier chip（2）With third amplifier chip
（3）Respectively corresponding the 8th pin VCC, the 4th pin VEE meet positive supply+16V and negative supply -16V respectively；Signal input is adopted
It is inputted with current source, is directly accessed the first amplifier chip（1）The second pin, small-signal by charge amplifier amplify with
Afterwards, pass through third amplifier chip（3）The 7th pin output；
First oval filter capacitor（16）, the second oval filter capacitor（17）, third ellipse filter capacitor（18）, the 4th oval filter
Wave capacitance（19）, the 5th oval filter capacitor（20）, the 6th oval filter capacitor（21）, the 7th oval filter capacitor（22）,
One oval filter inductance（23）, the second oval filter inductance（24）, third ellipse filter inductance（25）It is passive to connect and compose seven ranks
Elliptic filter；Seven ranks passive elliptic filter volume one end and impedance matching resistor（8）Connection, the other end and the first filter resistance
（9）Connection.
2. a kind of charge amplifier circuit according to claim 1, it is characterised in that：First amplifier chip（1）, second fortune
Put chip（2）, third amplifier chip（3）Model be double operational LF353P；First feedback resistance（4）Instead for 1 M Ω, second
Feed resistance（5）For 160K Ω, third feedback resistance（6）For 100 K Ω；First ground resistance（7）For 470 K Ω, the second ground connection
Resistance（11）For 17.8 K Ω, third ground resistance（12）For 20 K Ω；Impedance matching resistor（8）For 100 Ω；Feedback capacity
（13）For 1000pF；First filter resistance（9）For 2.2 K Ω, the second filter resistance（10）For 15 K Ω；First filter capacitor
（14）For 0.01uF, the second filter capacitor（15）For 0.022 uF；First oval filter capacitor（16）For 330nF, the second ellipse
Filter capacitor（17）For 680nF, third ellipse filter capacitor（18）For 680nF, the 4th oval filter capacitor（19）For 330nF,
5th oval filter capacitor（20）For 300nF, the 6th oval filter capacitor（21）For 47nF, the 7th oval filter capacitor（22）For
180nF；First oval filter inductance（23）For 0.94mH, the second oval filter inductance（24）It is filtered for 0.94mH, third ellipse
Inductance（25）For 1.14mH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759735.0A CN108809266A (en) | 2018-07-11 | 2018-07-11 | A kind of charge amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759735.0A CN108809266A (en) | 2018-07-11 | 2018-07-11 | A kind of charge amplifier circuit |
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| CN108809266A true CN108809266A (en) | 2018-11-13 |
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| CN201810759735.0A Pending CN108809266A (en) | 2018-07-11 | 2018-07-11 | A kind of charge amplifier circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202565232U (en) * | 2012-05-30 | 2012-11-28 | 四川兴达明科机电工程有限公司 | Charge amplifier |
| CN203251273U (en) * | 2013-05-08 | 2013-10-23 | 高怡达科技(深圳)有限公司 | Charge amplifier |
| CN204333948U (en) * | 2015-01-27 | 2015-05-13 | 仪特电子工业（宁波）有限公司 | Cross electric lightning protection filter circuit |
| JP6368591B2 (en) * | 2014-08-29 | 2018-08-01 | 新日本無線株式会社 | Charge amplifier circuit |
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2018
- 2018-07-11 CN CN201810759735.0A patent/CN108809266A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202565232U (en) * | 2012-05-30 | 2012-11-28 | 四川兴达明科机电工程有限公司 | Charge amplifier |
| CN203251273U (en) * | 2013-05-08 | 2013-10-23 | 高怡达科技(深圳)有限公司 | Charge amplifier |
| JP6368591B2 (en) * | 2014-08-29 | 2018-08-01 | 新日本無線株式会社 | Charge amplifier circuit |
| CN204333948U (en) * | 2015-01-27 | 2015-05-13 | 仪特电子工业（宁波）有限公司 | Cross electric lightning protection filter circuit |
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Application publication date: 20181113 |