CN108377135A - A kind of signal acquiring system - Google Patents
A kind of signal acquiring system Download PDFInfo
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- CN108377135A CN108377135A CN201810334467.8A CN201810334467A CN108377135A CN 108377135 A CN108377135 A CN 108377135A CN 201810334467 A CN201810334467 A CN 201810334467A CN 108377135 A CN108377135 A CN 108377135A
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- 230000003321 amplification Effects 0.000 claims abstract description 82
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 82
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000001629 suppression Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention belongs to field of circuit technology, more particularly to a kind of signal acquiring system.The present invention includes sensor, operation amplifier circuit, signal processing circuit, display output circuit, bandwidth-limited circuit, analog to digital conversion circuit, overvoltage crowbar, capacitance observation circuit, the signal input part of the sensor connects detected input signals, the signal output end of sensor is separately connected the signal input part of operation amplifier circuit, the signal input part of signal processing circuit, the signal input part of the signal output end connection display output circuit of the signal processing circuit, signal processing circuit respectively with overvoltage crowbar, two-way communication link between capacitance observation circuit, the signal output end of the operation amplifier circuit connects the signal input part of analog to digital conversion circuit by bandwidth-limited circuit.The present invention can realize acquisition and amplification to small-signal, can suppression common mode interference signal, and over-pressed phenomenon can be monitored in real time.
Description
Technical field
The invention belongs to field of circuit technology, more particularly to a kind of signal acquiring system.
Background technology
Operational amplifier is vital component in signal acquiring system, is in a kind of analogue layout
Basic module is mainly manufactured with CMOS technology, with the development of the integrated circuit of profession, can all there is many models every year
Operational amplifier is produced, and the major parameter of operational amplifier is gain and power consumption.
Signal acquiring system in the prior art can not be monitored over-pressed phenomenon in real time, and signal acquiring system
Operation amplifier circuit in small power consumption, can not ensure the requirement of its stability, thus there is an urgent need to provide a kind of noise it is low,
The good signal acquiring system of small power consumption, stability.
Invention content
The present invention in order to overcome the above-mentioned deficiencies of the prior art, provides a kind of signal acquiring system, and the present invention can be right
Over-pressed phenomenon is monitored in real time, and noise is low, small power consumption, stability are good.
Solve the problems, such as that techniques discussed above, the technical solution that the present invention takes are：
A kind of signal acquiring system include sensor, operation amplifier circuit, signal processing circuit, display output circuit,
The signal input part of bandwidth-limited circuit, analog to digital conversion circuit, overvoltage crowbar, capacitance observation circuit, the sensor connects
Detected input signals are connect, the signal output end of sensor is separately connected the signal input part of operation amplifier circuit, signal processing
The signal input part of circuit, the signal input part of the signal output end connection display output circuit of the signal processing circuit, letter
Number processing circuit two-way communication link between overvoltage crowbar, capacitance observation circuit respectively, the operation amplifier circuit
Signal output end pass through bandwidth-limited circuit connect analog to digital conversion circuit signal input part, the letter of analog-digital conversion circuit as described
The signal input part of number output end connection display output circuit.
Preferably, the operation amplifier circuit includes signal primary amplification system, secondary transducers operational amplification system
And power supply system, the signal input part of the signal primary amplification system is connected with the signal output end of sensor, described
The signal input part of secondary transducers operational amplification system is connected with the signal output end of signal primary amplification system, and secondary passes
Signal output end of the signal output end of sensor operational amplification system as operation amplifier circuit, the secondary transducers operation
Amplification system is used to follow the voltage change of power supply system, and amplification is compensated to the output signal of signal primary amplification system,
The signal input part of the signal output end connection bandwidth-limited circuit of secondary transducers operational amplification system.
Preferably, the signal primary amplification system includes two-stage amplification system, respectively level-one amplification system and two level
Amplification system, the signal input part of the signal input part of the level-one amplification system as operation amplifier circuit, level-one amplification
The signal input part of system is connected with the signal output end of sensor, and signal output end and the two level of level-one amplification system are amplified
The signal input part of system is connected, signal output end and the secondary transducers operational amplification system of the two level amplification system
Signal input part is connected.
Preferably, the secondary transducers operational amplification system includes that filter unit, frequency compensation filter unit, signal are anti-
Unit is presented, the signal input part of the filter unit is connected with the signal output end of two level amplification system, the letter of filter unit
Number output end is connected with the signal input part of frequency compensation filter unit, the signal output end of the frequency compensation filter unit
It is connected with the signal input part of signal feedback unit, the signal output end of the signal feedback unit and bandwidth-limited circuit
Signal input part is connected.
It is further preferred that the filter unit includes the first capacitance C1, first resistor R1, second resistance R2, described the
One end of one capacitance C1, one end of second resistance R2 are all connected with the signal output end of two level amplification system, the second resistance R2
The other end be separately connected one end of first resistor R1 and the signal input part of frequency compensation filter unit, first capacitance
The other end of C1, the other end of first resistor R1 are grounded.
It is further preferred that the frequency compensation filter unit includes the first diode D1, the second diode D2, the second electricity
Hold C2, the first inductance L1, third capacitance C3, the 4th capacitance C4, the first amplifier A1, the anode of the first diode D1 connects
The cathode on ground, the second diode D2 connects power supply, and the cathode of the first diode D1, the anode of the second diode D2 are all connected with
One end of first resistor R1, one end of the 4th capacitance C4, one end of the first inductance L1, the second capacitance C2 one end, described second
The other end of capacitance C2, the first inductance L1 the other end be all connected with one end of third capacitance C3, the first amplifier A1 anode letter
Number input terminal, the other end ground connection of the third capacitance C3, the other end of the 4th capacitance C4 connect the first amplifier A1's
Negative signal input terminal, the signal output end of the signal output end of the first amplifier A1 as operation amplifier circuit.
It is further preferred that the signal feedback unit includes 3rd resistor R3 and the 4th resistance R4, the 3rd resistor
One end of R3 connects the signal output end of the first amplifier A1, and the other end of 3rd resistor R3 is separately connected the first amplifier A1's
One end of negative signal input terminal, the 4th resistance R4, the other end ground connection of the 4th resistance R4.
It is further preferred that the model LM393 of the first amplifier A1.
It is further preferred that the overvoltage crowbar includes overvoltage protection chip, the model of the overvoltage protection chip
WS3203。
It is further preferred that the capacitance observation circuit includes capacitance monitoring chip, the model of the capacitance monitoring chip
For AD7746.
Beneficial effects of the present invention are：
(1), the present invention includes sensor, operation amplifier circuit, signal processing circuit, display output circuit, band logical filter
Wave circuit, analog to digital conversion circuit, overvoltage crowbar, capacitance observation circuit, the present invention can realize the acquisition to small-signal
And amplification, can suppression common mode interference signal, and over-pressed phenomenon can be monitored in real time.
(2), the operation amplifier circuit include signal primary amplification system, secondary transducers operational amplification system and
Power supply system, the influence present invention effectively avoids the variation of voltage to operational amplifier, and also the noise of the present invention is low, work(
Consume that small, stability is good.
(3), the present invention substantially increases the power supply rejection ratio of operation amplifier circuit, and practicability is good.
Description of the drawings
The content of every width attached drawing expression in description of the invention and the label in figure are briefly described below：
Fig. 1 is the structural principle block diagram of the signal acquiring system of one embodiment of the present of invention；
Fig. 2 is the structural principle block diagram of the operation amplifier circuit of one embodiment of the present of invention；
Fig. 3 is the circuit diagram of the signal primary amplification system of one embodiment of the present of invention；
Fig. 4 is the circuit diagram of the secondary transducers operational amplification system of one embodiment of the present of invention.
Label in above-mentioned figure is：
10-signal primary amplification system 20-secondary transducers operational amplification systems
Specific implementation mode
Below against attached drawing, to shape, construction, each section of for example involved each component of specific implementation mode of the present invention
Between mutual alignment and connection relation, the effect of each section and operation principle etc. is described in further detail：
As shown in Figure 1, a kind of signal acquiring system includes sensor, operation amplifier circuit, signal processing circuit, display
Output circuit, bandwidth-limited circuit, analog to digital conversion circuit, overvoltage crowbar, capacitance observation circuit, the signal of the sensor
Input terminal connects detected input signals, the signal output end of sensor be separately connected the signal input part of operation amplifier circuit,
The signal of the signal input part of signal processing circuit, the signal output end connection display output circuit of the signal processing circuit is defeated
Enter end, the signal processing circuit two-way communication link between overvoltage crowbar, capacitance observation circuit respectively, the operation amplifier
The signal output end of device circuit connects the signal input part of analog to digital conversion circuit, the analog-to-digital conversion electricity by bandwidth-limited circuit
The signal input part of the signal output end connection display output circuit on road.
The overvoltage crowbar is used for the internal cause overvoltage protection to being generated during capacitor group switching；
The capacitance observation circuit is used to monitor the working condition of capacitance；
Specifically, the overvoltage crowbar includes overvoltage protection chip, the model WS3203 of the overvoltage protection chip；
Capacitance observation circuit includes capacitance monitoring chip, the model AD7746 of the capacitance monitoring chip.
Detected input signals first pass around operation amplifier circuit, realize the amplification to signal, can be to different faint
Signal realizes that different amplifications, operation amplifier circuit can dramatically reduce common mode interference signal, operational amplifier electricity
Road will further be filtered after signal filter and amplification by bandwidth-limited circuit, is removed interference signal, is finally sent the signal to mould
Number conversion circuit, converts analog signals into digital signal, digital signal, which is finally sent to display output circuit, shows
Analysis.
As shown in Fig. 2, the operation amplifier circuit includes signal primary amplification system 10, secondary transducers operation amplifier
The signal input part of system 20 and power supply system, the signal primary amplification system 10 is connected with the signal output end of sensor
It connects, the signal output end phase of the signal input part and signal primary amplification system 10 of the secondary transducers operational amplification system 20
Connection, the signal output end of the signal output end of secondary transducers operational amplification system 20 as operation amplifier circuit are described
Secondary transducers operational amplification system 20 is used to follow the voltage change of power supply system, the output to signal primary amplification system 10
Signal compensates amplification, and the signal of the signal output end connection bandwidth-limited circuit of secondary transducers operational amplification system 20 is defeated
Enter end.
As shown in figure 3, the signal primary amplification system 10 include two-stage amplification system, respectively level-one amplification system and
Two level amplification system, the signal input part of the signal input part of the level-one amplification system as operation amplifier circuit, level-one
The signal input part of amplification system is connected with the signal output end of sensor, the signal output end and two level of level-one amplification system
The signal input part of amplification system is connected, signal output end and the secondary transducers operation amplifier system of the two level amplification system
The signal input part of system 20 is connected.
Specifically, the level-one amplification system includes the first transistor V1, second transistor V2, third transistor V3,
Four transistor V4, the two level amplification system include the 5th transistor V5, the 6th transistor V6, the 7th transistor V7, the 8th crystalline substance
Body pipe V8.
As shown in figure 4, the secondary transducers operational amplification system 20 include filter unit, frequency compensation filter unit,
The signal input part of signal feedback unit, the filter unit is connected with the signal output end of two level amplification system, and filtering is single
The signal output end of member is connected with the signal input part of frequency compensation filter unit, the signal of the frequency compensation filter unit
Output end is connected with the signal input part of signal feedback unit, the signal output end and bandpass filtering of the signal feedback unit
The signal input part of circuit is connected.
As shown in figure 4, the filter unit includes the first capacitance C1, first resistor R1, second resistance R2, first electricity
One end of one end, second resistance R2 for holding C1 is all connected with the signal output end of two level amplification system, and the second resistance R2's is another
One end is separately connected one end of first resistor R1 and the signal input part of frequency compensation filter unit, the first capacitance C1's
The other end, first resistor R1 the other end be grounded.
The frequency compensation filter unit includes the first diode D1, the second diode D2, the second capacitance C2, the first inductance
L1, third capacitance C3, the 4th capacitance C4, the first amplifier A1, the plus earth of the first diode D1, the second diode D2
Cathode connect power supply, the cathode of the first diode D1, the anode of the second diode D2 are all connected with the one of first resistor R1
End, one end of the 4th capacitance C4, one end of the first inductance L1, the second capacitance C2 one end, the other end of the second capacitance C2,
The other end of first inductance L1 be all connected with one end of third capacitance C3, the first amplifier A1 positive signal input terminal, described
The other end of three capacitance C3 is grounded, and the other end of the 4th capacitance C4 connects the negative signal input terminal of the first amplifier A1,
Signal output end of the signal output end of the first amplifier A1 as operation amplifier circuit.
The signal feedback unit includes 3rd resistor R3 and the 4th resistance R4, one end connection of the 3rd resistor R3 the
The other end of the signal output end of one amplifier A1,3rd resistor R3 is separately connected the negative signal input of the first amplifier A1
It holds, one end of the 4th resistance R4, the other end ground connection of the 4th resistance R4.
Specifically, the model LM393 of the first amplifier A1.
The secondary transducers operational amplification system 20 follows the voltage change of power supply system, exports amplified signal,
Voltage will not impact the output signal of operational amplifier, can be improved to the power supply rejection ratio of operational amplifier.
In conclusion the present invention includes sensor, operation amplifier circuit, signal processing circuit, display output circuit, band
Bandpass filter circuit, analog to digital conversion circuit, overvoltage crowbar, capacitance observation circuit, the present invention can be realized to small-signal
Acquisition and amplification, can suppression common mode interference signal, and over-pressed phenomenon can be monitored in real time.
The present invention substantially increases the power supply rejection ratio of operation amplifier circuit, and practicability is good.
The above content is combine specific preferred embodiment to the further description of the invention made, and it cannot be said that originally
The specific implementation mode of invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs,
The other embodiment obtained in the case where not departing from technical scheme of the present invention, should be included within the scope of the present invention.
Claims (10)
1. a kind of signal acquiring system, it is characterised in that：Including sensor, operation amplifier circuit, signal processing circuit, display
Output circuit, bandwidth-limited circuit, analog to digital conversion circuit, overvoltage crowbar, capacitance observation circuit, the signal of the sensor
Input terminal connects detected input signals, the signal output end of sensor be separately connected the signal input part of operation amplifier circuit,
The signal of the signal input part of signal processing circuit, the signal output end connection display output circuit of the signal processing circuit is defeated
Enter end, the signal processing circuit two-way communication link between overvoltage crowbar, capacitance observation circuit respectively, the operation amplifier
The signal output end of device circuit connects the signal input part of analog to digital conversion circuit, the analog-to-digital conversion electricity by bandwidth-limited circuit
The signal input part of the signal output end connection display output circuit on road.
2. a kind of signal acquiring system as described in claim 1, it is characterised in that：The operation amplifier circuit includes signal
Primary amplification system (10), secondary transducers operational amplification system (20) and power supply system, the signal primary amplification system
(10) signal input part is connected with the signal output end of sensor, the letter of the secondary transducers operational amplification system (20)
Number input terminal is connected with the signal output end of signal primary amplification system (10), secondary transducers operational amplification system (20)
Signal output end of the signal output end as operation amplifier circuit, the secondary transducers operational amplification system (20) be used for
With the voltage change of power supply system, amplification, secondary transducers are compensated to the output signal of signal primary amplification system (10)
The signal input part of the signal output end connection bandwidth-limited circuit of operational amplification system (20).
3. a kind of signal acquiring system as claimed in claim 2, it is characterised in that：Signal primary amplification system (10) packet
Include two-stage amplification system, respectively level-one amplification system and two level amplification system, the signal input part of the level-one amplification system
As the signal input part of operation amplifier circuit, the signal input part of level-one amplification system and the signal output end phase of sensor
Connection, the signal output end of level-one amplification system are connected with the signal input part of two level amplification system, two level amplification system
The signal output end of system is connected with the signal input part of secondary transducers operational amplification system (20).
4. a kind of signal acquiring system as claimed in claim 3, it is characterised in that：The secondary transducers operational amplification system
(20) include filter unit, frequency compensation filter unit, signal feedback unit, the signal input part and two level of the filter unit
The signal output end of amplification system is connected, the signal input part of the signal output end and frequency compensation filter unit of filter unit
It is connected, the signal output end of the frequency compensation filter unit is connected with the signal input part of signal feedback unit, described
The signal output end of signal feedback unit is connected with the signal input part of bandwidth-limited circuit.
5. a kind of signal acquiring system as claimed in claim 4, it is characterised in that：The filter unit includes the first capacitance
C1, first resistor R1, second resistance R2, one end of the first capacitance C1, one end of second resistance R2 are all connected with two level amplification
The other end of the signal output end of system, the second resistance R2 is separately connected one end and the frequency compensation filter of first resistor R1
The signal input part of wave unit, the other end of the first capacitance C1, the other end of first resistor R1 are grounded.
6. a kind of signal acquiring system as claimed in claim 5, it is characterised in that：The frequency compensation filter unit includes the
One diode D1, the second diode D2, the second capacitance C2, the first inductance L1, third capacitance C3, the 4th capacitance C4, the first amplification
The cathode of device A1, the plus earth of the first diode D1, the second diode D2 connect power supply, the first diode D1's
Cathode, the second diode D2 anode be all connected with one end of first resistor R1, one end of the 4th capacitance C4, the first inductance L1 one
It holds, one end of the second capacitance C2, the other end of the second capacitance C2, the other end of the first inductance L1 are all connected with third capacitance C3
One end, the first amplifier A1 positive signal input terminal, the third capacitance C3 the other end ground connection, the 4th capacitance C4
The other end connect the first amplifier A1 negative signal input terminal, the signal output end of the first amplifier A1 is as operation
The signal output end of amplifier circuit.
7. a kind of signal acquiring system as claimed in claim 6, it is characterised in that：The signal feedback unit includes third electricity
R3 and the 4th resistance R4 is hindered, one end of the 3rd resistor R3 connects the signal output end of the first amplifier A1,3rd resistor R3
The other end be separately connected one end of the negative signal input terminal of the first amplifier A1, the 4th resistance R4, the 4th resistance R4
The other end ground connection.
8. a kind of signal acquiring system as claimed in claim 7, it is characterised in that：The model of the first amplifier A1
LM393。
9. a kind of signal acquiring system as described in claim 1~8 any one, it is characterised in that：The overvoltage protection electricity
Road includes overvoltage protection chip, the model WS3203 of the overvoltage protection chip.
10. a kind of signal acquiring system as claimed in claim 9, it is characterised in that：The capacitance observation circuit includes capacitance
Monitor chip, the model AD7746 of the capacitance monitoring chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810334467.8A CN108377135B (en) | 2018-04-14 | 2018-04-14 | Signal acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810334467.8A CN108377135B (en) | 2018-04-14 | 2018-04-14 | Signal acquisition system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108377135A true CN108377135A (en) | 2018-08-07 |
| CN108377135B CN108377135B (en) | 2020-09-18 |
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ID=63032262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810334467.8A Active CN108377135B (en) | 2018-04-14 | 2018-04-14 | Signal acquisition system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532507A (en) * | 2013-10-23 | 2014-01-22 | 成都市宏山科技有限公司 | Sensor signal operational amplifier |
| CN203406831U (en) * | 2013-07-11 | 2014-01-22 | 长沙理工大学 | Amplification circuit with zero correction circuit |
| CN205655864U (en) * | 2016-04-28 | 2016-10-19 | 成都齐沃农业科技有限公司 | Environment monitoring device based on wireless communication |
| CN106357264A (en) * | 2015-07-14 | 2017-01-25 | 张学 | Small signal amplifying measurement circuit |
| CN107911119A (en) * | 2017-12-12 | 2018-04-13 | 成都互聚科技有限公司 | A kind of gathered data processing system applied to security monitoring device |
-
2018
- 2018-04-14 CN CN201810334467.8A patent/CN108377135B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203406831U (en) * | 2013-07-11 | 2014-01-22 | 长沙理工大学 | Amplification circuit with zero correction circuit |
| CN103532507A (en) * | 2013-10-23 | 2014-01-22 | 成都市宏山科技有限公司 | Sensor signal operational amplifier |
| CN106357264A (en) * | 2015-07-14 | 2017-01-25 | 张学 | Small signal amplifying measurement circuit |
| CN205655864U (en) * | 2016-04-28 | 2016-10-19 | 成都齐沃农业科技有限公司 | Environment monitoring device based on wireless communication |
| CN107911119A (en) * | 2017-12-12 | 2018-04-13 | 成都互聚科技有限公司 | A kind of gathered data processing system applied to security monitoring device |
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| CN108377135B (en) | 2020-09-18 |
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