CN110061711A - Signal amplification circuit and electronic device - Google Patents
Signal amplification circuit and electronic device Download PDFInfo
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- CN110061711A CN110061711A CN201910471903.0A CN201910471903A CN110061711A CN 110061711 A CN110061711 A CN 110061711A CN 201910471903 A CN201910471903 A CN 201910471903A CN 110061711 A CN110061711 A CN 110061711A
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- 230000003321 amplification Effects 0.000 title claims abstract description 92
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 92
- 239000000523 sample Substances 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims description 39
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000001052 transient effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/083—Means for indicating or recording, e.g. for remote indication electrical
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Amplification And Gain Control (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A kind of signal amplification circuit, comprising: amplification module amplifies for the sensing signal to an air pressure probe and export the first amplified signal, wherein the amplification module has a preset gain；Gain controllable module is electrically connected to the amplification module, for amplifying to first amplified signal and exporting the second amplified signal；And control unit, it is electrically connected to the gain controllable module, for detecting second amplified signal, and second amplified signal is compared to generation control signal with preset signals value；Wherein, the gain controllable module is also used to carry out gain adjustment according to the control signal.The present invention also provides a kind of electronic devices.The signal of air pressure probe can be amplified to zone of reasonableness, utmostly reduce distorted signals by above-mentioned signal amplification circuit and electronic device.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of sensing signal progress for air pressure probe
The signal amplification circuit of amplification and electronic device comprising the signal amplification circuit.
Background technique
Air pressure probe can generate a degree of electric signal output, the electric signal after sensing measured information
It is fainter, it needs to be detected by back-end circuit after amplifying circuit amplifies, but is easy if amplification factor is excessive
Cause distorted signals.Automatic growth control (AGC) circuit is usually used to realize from gain adjustment and amplify in existing way, but
Since the voltage of the electric signal of air pressure probe output is minimum, the nominal input voltage that may be unable to reach agc circuit is wanted
It asks, is easy to make the resonance curve of controlled amplification grade to deform, causes distorted signals.
Summary of the invention
In view of the foregoing, it is necessary to a kind of signal amplification circuit and electronic device are provided, air pressure can be sensed
The signal of device is amplified to zone of reasonableness, utmostly reduces distorted signals.
An embodiment of the present invention provides a kind of signal amplification circuit, for the sensing signal to air pressure probe into
Row amplification, comprising:
Amplification module amplifies for the sensing signal to an air pressure probe and exports the first amplified signal,
Wherein the amplification module has a preset gain；
Gain controllable module is electrically connected to the amplification module, for amplifying to first amplified signal and defeated
Second amplified signal out；And
Control unit is electrically connected to the gain controllable module, for detecting second amplified signal, and by described
Two amplified signals are compared generation control signal with preset signals value；
Wherein, the gain controllable module is also used to carry out gain adjustment according to the control signal.
Preferably, the sensing signal of the air pressure probe is AC signal, and the signal amplification circuit further includes
Be electrically connected to the bias treatment module of the amplification module, the sensing signal of the air pressure probe by the biasing at
It manages after module carries out voltage bias processing and exports to the amplification module.
Preferably, the bias treatment module includes:
First capacitor, one end are used to receive the sensing signal of the air pressure probe；
Transient supression diode, one end are electrically connected to one end of the first capacitor, other end ground connection；
First resistor, one end are electrically connected to the other end of the first capacitor, and the other end is electrically connected to a power end；And
Second resistance, one end are electrically connected to the common end of the first resistor Yu the first capacitor, other end ground connection.
Preferably, the amplification module includes the first amplifying unit and the second amplifying unit, and first amplifying unit is used
In the amplification for carrying out the first preset gain, second amplifying unit is used to carry out the amplification of the second preset gain, and described second
Preset gain is greater than first preset gain.
Preferably, first amplifying unit includes:
First amplifier, positive input terminal is for receiving the sensing signal；And
3rd resistor, be electrically connected to first amplifier negative input end and first amplifier output end it
Between；
Second amplifying unit includes:
Second capacitor, one end are electrically connected to the output end of first amplifier；
4th resistance, one end are electrically connected to the other end of second capacitor；
Second amplifier, positive input terminal are electrically connected to one end of the 5th resistance and one end of the 6th resistance, negative input end electricity
It is connected to the other end of the 4th resistance, the other end of the 5th resistance is connected to a power end, the 6th resistance
Other end ground connection；And
7th resistance, be electrically connected to second amplifier negative input end and second amplifier output end it
Between.
Preferably, the gain controllable module includes:
Third capacitor, one end are electrically connected to the amplification module；
8th resistance, one end are electrically connected to the other end of the third capacitor；
Third amplifier, positive input terminal are electrically connected to the other end of the 8th resistance, and negative input end is electrically connected to the 9th
The other end of one end of resistance and one end of the tenth resistance, the 9th resistance is electrically connected to the other end of the 8th resistance,
The other end of tenth resistance is grounded；
Analog switch chip, including the first to the 8th input, output end and first, to third control terminal, the simulation is opened
The output end for closing chip is electrically connected to the output end of the third amplifier and the detecting pin of described control unit, the simulation
The first of switch chip to third control terminal is electrically connected to the control pin of described control unit, and the of the analog switch chip
One to the 8th input terminal is electrically connected in one end of a feedback resistance, and the other end of each feedback resistance is electrically connected to
The positive input terminal of the third amplifier, and each feedback resistance has different resistance values.
Preferably, the signal amplification circuit further includes level switch module, is electrically connected to the control of described control unit
The first of pin and the analog switch chip is to third control terminal, and the level switch module is for defeated to the control pin
Control signal out carries out level conversion, and the control signal of the first level of the control pin output is converted into the second electricity
Flat control signal to the analog switch chip first to third control terminal, wherein the second electrical level is greater than described first
Level.
Preferably, the signal amplification circuit further includes analog-to-digital conversion module, the input terminal electricity of the analog-to-digital conversion module
It is connected to the output end of the analog switch chip and the output end of the third amplifier, the output of the analog-to-digital conversion module
End is electrically connected to the detecting pin of described control unit, and the analog-to-digital conversion module is used for the output end to the third amplifier
Level signal carry out analog-to-digital conversion, with the detecting pin of output digit signals to described control unit.
Preferably, the signal amplification circuit further include be electrically connected to the gain controllable module impedance conversion module and
Division module；The impedance conversion module includes a voltage follower, and second for exporting to the gain controllable module puts
Big signal carries out impedance conversion process；The division module, the second amplified signal for being exported to the gain controllable module
Voltage division processing is carried out, described control unit is also used to sample the second amplified signal after voltage division processing, with detection
The sensing signal of the air pressure probe.
An embodiment of the present invention also provides a kind of electronic device, and the electronic device includes above-mentioned signal amplification electricity
Road.
Compared with prior art, above-mentioned signal amplification circuit and electronic device pass through the amplification module of a fixed gain
The sensing signal of air pressure probe is amplified with an AGC amplification module is unified, realization first amplifies sensing signal
To measuring range, then gain control is carried out, the amplification module of the fixed gain can first amplify faint sensing signal
Lead to simultaneously to the measuring range of AGC amplification module so that the input voltage of AGC amplification module meets nominal input voltage requirement
The gain for crossing control chip adjust automatically AGC amplification module, so that the signal of air pressure probe is in always after amplification
In reasonable amplitude range, farthest reduce distorted signals.
Detailed description of the invention
Fig. 1 is the functional block diagram of the electronic device in an embodiment of the present invention.
Fig. 2 is the functional block diagram of the signal amplification circuit in another embodiment of the present invention.
Fig. 3 A and Fig. 3 B is the circuit diagram of the signal amplification circuit in an embodiment of the present invention.
Fig. 4 is the circuit diagram of the level conversion unit in an embodiment of the present invention.
Main element symbol description
Specific embodiment
The present invention that the following detailed description will be further explained with reference to the above drawings.
Referring to Fig. 1, providing a kind of electronic device 1 for an embodiment of the present invention.The electronic device 1 is put including signal
Big circuit 100 and air pressure probe 200.The signal amplification circuit 100 can be used to defeated to air pressure probe 200
Sensing signal out is amplified to reasonable amplitude range, can be utmostly so that back-end circuit carries out sensing signal reading
Reduce distorted signals.
In one embodiment, after air pressure probe 200 detects the variation of pressure, it can generate and export a telecommunications
Number, the electrical signal intensity is fainter, need to could be detected by back-end circuit after amplifying circuit enhanced processing, but if putting
The excessive non-linear distortion for be easy to causeing signal of big multiple.The signal amplification circuit 100 can be by air pressure probe 200
Signal be amplified to zone of reasonableness, it can be achieved that gain from control.
The signal amplification circuit 100 includes amplification module 10, gain controllable module 20 and control unit 30.When the sky
After air pressure force snesor 200 senses the variation of air pressure, a sensing signal can be generated and export, the sensing signal is more micro-
It is weak, it can preferably be detected by back-end circuit after being amplified by the signal amplification circuit 100.
The amplification module 10 is for amplifying the sensing signal that air pressure probe 200 exports and exporting first
Amplified signal, wherein the amplification module 10 has a preset gain.The gain controllable module 20 is electrically connected to the amplification
Module 10, the gain controllable module 20 is for amplifying first amplified signal and exporting the second amplified signal.Institute
It states control unit 30 and is electrically connected to the gain controllable module 20, described control unit 30 is for detecting the second amplification letter
Number, and second amplified signal is compared to generation control signal with preset signals value.The gain controllable module 20 is also
For carrying out gain adjustment according to the control signal, so that the second amplified signal of output is in default amplitude range, it is maximum
Degree reduces distorted signals.
The signal amplification circuit 100 is realized by the amplification module 10 to the output of air pressure probe 200
The amplification of multiple is fixed in sensing signal, so that the voltage of the input signal of gain controllable module 20 is in zone of reasonableness (in institute
Within the scope of the measuring range for stating gain controllable module 20), then described control unit can be passed through according to the difference of signal magnitude
30 adjust the gain of the gain controllable module 20, so that amplified signal is in always within reasonable amplitude range, most
Big degree reduces distorted signals and back-end circuit is facilitated to sample the sensing signal after enhanced processing.
In one embodiment, it can detect to obtain the input letter of gain controllable module 20 by described control unit 30
Number signal magnitude, to adjust the gain of the gain controllable module 20 according to different signal magnitudes, so that amplified letter
Number always within reasonable amplitude range.For example, smaller signal carries out the amplification of larger multiple, larger signal carries out smaller
The amplification of multiple, so that amplified signal is in always within reasonable amplitude range.
Please refer to Fig. 2, the sensing signal that the air pressure probe 200 exports is AC signal.The signal
Amplifying circuit 100 further includes the bias treatment module 40 for being electrically connected to the amplification module 10, the air pressure probe 200
The sensing signal of output by the bias treatment module 40 carry out voltage bias processing after output to the amplification module 10 into
Row amplification.
In one embodiment, the amplification module 10 includes the first amplifying unit 102 and the second amplifying unit 104.Institute
It states the first amplifying unit 102 and is electrically connected for carrying out the amplification of the first preset gain, second amplifying unit 104 to sensing signal
It is connected to first amplifying unit 102, second amplifying unit 104 is used for amplified by the first amplifying unit 102
Signal carries out the amplification of the second preset gain.First preset gain can make with second preset gain according to actual
It is set with demand.For example, the amplification factor of first amplifying unit 102 is 5 times, second amplifying unit 104
Amplification factor is 15 times, and second preset gain is greater than first preset gain at this time.
In one embodiment, the gain controllable module 20 includes one for carrying out the switching of feedback resistance resistance value switching
Module 202, to realize the adjustment gain controllable module by the feedback resistance resistance value for changing the gain controllable module 20
20 gain.
In one embodiment, the switching module 202 can realize feedback resistance resistance value by analog switch chip
Switching.Described control unit 30 can be a control chip, for example described control unit 30 can be MCU, single-chip microcontroller etc..It is described
Signal amplification circuit 100 can also include analog-to-digital conversion module 50, level switch module 60, impedance conversion module 70 and partial pressure mould
Block 80.The analog-to-digital conversion module 50 is electrically connected to the gain controllable module 20 and described control unit 30, and the modulus turns
Second amplified signal that mold changing block 50 is used to will test is converted into digital signal and is input to described control unit 30, in turn
Described control unit 30 may be implemented to be compared to second amplified signal and preset signals value to generate control signal.
In one embodiment, due to the pin of pin level (the generally 3.3V) and analog switch chip of control chip
Level (generally 5V) is inconsistent, may be implemented that chip output control signal control will be controlled by the level switch module 60
The analog switch chip.Specifically, the level switch module 60 is electrically connected to described control unit 30 and the gain can
Module 20 is controlled, the level switch module is used to carry out level conversion to the control signal of the control chip output, by the
The control signal of one level is converted into the analog switch chip for controlling signal to the gain controllable module 20 of second electrical level,
Described in second electrical level be preferably greater than first level.For example, the level switch module 60 will control what chip exported
3.3V control signal is converted into the control signal of 5V, and then can control the analog switch chip and gated.
The impedance conversion module 70 is electrically connected to the gain controllable module 20, and the impedance conversion module 70 includes one
Voltage follower, the second amplified signal for exporting to the gain controllable module carry out impedance conversion process, realize impedance
Matching.The impedance conversion module 70 can play the role of buffering be isolated, reduce signal distortion.
In one embodiment, due in the pin level (generally 3.3V) and gain controllable module 20 of control chip
The pin level (generally 5V) of amplifier is inconsistent, may be implemented to allow controlling chip normal sample by the division module 80
Amplified sensing signal does not exceed the sampling upper limit of control chip.Specifically, the division module 80 is electrically connected to described
Impedance conversion module 70, the second amplified signal that the division module 80 is used to export the gain controllable module 20 are divided
Pressure processing, and then the control chip can sample the second amplified signal after voltage division processing, to realize detection
Amplified sensing signal.
Fig. 3 A and 3B are please referred to, provides a kind of circuit diagram of signal amplification circuit 100 for an embodiment of the present invention.
The air pressure probe 200 can realize that power supply and sensing signal are transmitted by audio interface 202, than
Such as, the air pressure probe 200 can be connected to the signal amplification circuit 100 by the audio interface of 3.5mm.
The bias treatment module 40 includes the electricity of transient supression diode TVS1, first to 3rd resistor R1~R3 and first
Hold C1.One end of the transient supression diode TVS1 is used to receive the sensing signal that the air pressure probe 200 exports,
The other end of the transient supression diode TVS1 is grounded.One end of the first resistor R1 is electrically connected to the transient supression two
One end of pole pipe TVS1, the other end ground connection of the first resistor R1.One end of the first capacitor C1 is electrically connected to described
One end of one resistance R1, the other end of the first capacitor C1 are electrically connected to one end and the third electricity of the second resistance R2
One end of R3 is hindered, the other end of the second resistance R2 is electrically connected to the first power end Vcc1, and the 3rd resistor R3's is another
End ground connection.The voltage of first power end Vcc1 can be set according to actual needs.In other embodiments of the invention,
The first resistor R1 also can be omitted.
First amplifying unit 102 includes the first amplifier OP1, the 4th to the 6th resistance R4~R6, the second capacitor C2
And third capacitor C3.The positive input terminal of the first amplifier OP1 is electrically connected to one end of the 3rd resistor R3, and the described 4th
Resistance R4 is electrically connected between the negative input end and output end of the first amplifier OP1.One end electricity of the second capacitor C2
It is connected to one end of the 4th resistance R4, the other end of the second capacitor C2 is electrically connected to the one of the 5th resistance R5
End, the other end of the 5th resistance R5 are electrically connected to the other end of the 4th resistance R4.One end of the 6th resistance R6
It is electrically connected to one end of the 4th resistance R4, the other end of the 6th resistance R6 is electrically connected to the one of the third capacitor C3
End, the other end ground connection of the third capacitor C3.In other embodiments of the invention, first amplifying unit 102
Subelement can be omitted, for example third capacitor C3 and the 6th resistance R6 can be omitted.
Second amplifying unit 104 includes the 4th capacitor C4, the 7th to eleventh resistor R7~R11 and the second amplifier
OP2.The 7th resistance R7, the 4th capacitor C4 and the 8th resistance R8 are successively connected in series in first amplifier
Between the output end of OP1 and the negative input end of the second amplifier OP2.The 9th resistance R9 is electrically connected to described second and puts
Between the negative input end and output end of big device OP2.The positive input terminal of the second amplifier OP2 is electrically connected to the tenth resistance
One end of R10 and one end of the eleventh resistor R11, the other end of the tenth resistance R10 are electrically connected to second source end
The other end of Vcc2, the eleventh resistor R11 are grounded.The voltage value of second source end Vcc2 can carry out according to actual needs
Setting.In other embodiments of the invention, the subelement of second amplifying unit 104 be can be omitted, such as the 7th
Resistance R7 can be omitted or the 8th resistance R8 can be omitted.
Described control unit 30 includes a MCU.The gain controllable module 20 includes the 5th capacitor C5, third amplifier
OP3, the 12nd to the 15th resistance R12~R15, analog switch chip CD1 and first to the 8th feedback resistance Rb1~Rb8.Institute
Twelfth resistor R12, the 5th capacitor C5 and the thirteenth resistor R13 is stated successively to be connected in series in second amplifier
Between the output end of OP2 and the positive input terminal of the third amplifier OP3.The 14th resistance R14 is electrically connected to described
Between the positive input terminal and negative input end of three amplifier OP3, one end of the 15th resistance R15 is electrically connected to the third and puts
The negative input end of big device OP3, the other end ground connection of the 15th resistance R15.The analog switch chip CD1 include first to
8th incoming end CH1~CH8, common end COM and first are to third control terminal A1, B1, C1.Described first to the 8th incoming end
CH1~CH8 corresponds the one end for being electrically connected to the described first to the 8th feedback resistance Rb1~Rb8, and described first to the 8th is anti-
The other end of feed resistance Rb1~Rb8 is electrically connected to the positive input terminal of the third amplifier OP3.The common end COM is electrically connected
It is connected to the output end of the third amplifier OP3, described first to third control terminal A1, B1, C1 is electrically connected to the MCU, with
Receive the control signal of the MCU output.In other embodiments of the invention, the part member of the gain controllable module 20
Part can be omitted, for example twelfth resistor R12 can be omitted or thirteenth resistor R13 can be omitted.
In one embodiment, the gain controllable module 20 can also include being electrically connected to the third amplifier OP3
Positive input terminal and output end between digital regulation resistance, the resistance value of the digital regulation resistance is controlled by the MCU, realize
The adjustable gain of the gain controllable module 20.
In one embodiment, first to the 8th feedback resistance Rb1~Rb8 has different resistance values, i.e., the described gain
Controllable module 20 can have eight groups of different gain shifts.The different switch states of analog switch chip CD1 are controlled by MCU
Eight groups of different feedback resistances are obtained, and then may be implemented to adjust the gain of the gain controllable module 20.
In one embodiment, the common end COM is also electrically coupled to the MCU, so that the MCU can detecte
To second amplified signal, and second amplified signal is compared to generate control letter with the preset signals value prestored
Number.When detect second amplified signal be greater than the preset signals value, can export reduce gain control signal, in turn
So that the gain controllable module 20 switches to smaller gain shift；When detecting that it is described default that second amplified signal is less than
Signal value can export the control signal for increasing gain, so that the gain controllable module 20 switches to larger gain shelves
Position.
In one embodiment, the MCU is electrically connected by the analog-to-digital conversion module 50 with the common end COM,
The signal of the output end of the third amplifier OP3 is input to described after the analog-to-digital conversion module 50 carries out analog-to-digital conversion
MCU, the MCU carry out operation to the digital signal of input, and operation result is compared with preset signals value, when detecting
The output valve of third amplifier OP3 it is small with preset signals value when, can control the analog switch chip CD1 and increase step by step
Benefit can control the analog switch chip CD1 when the output valve for detecting third amplifier OP3 is greater than preset signals value
Reduce gain, step by step to determine the gain of best match.The particular circuit configurations of the analog-to-digital conversion module 50 can be using existing
There is the AD conversion unit of technology, is not limited thereto.
In one embodiment, the MCU also pass through level switch module 60 with described first to third control terminal A1,
B1, C1 are electrically connected to.The level switch module 60 can believe the control that the 3.3V control signal that MCU is exported is converted to 5V
Number, and then control using the control signal of 5V the switching that the analog switch chip CD1 carries out different switch states.The electricity
Flat conversion module 60 may include three level conversion units 602, and each level conversion unit 602 is electrically connected to a control of MCU
Between a control terminal A1/B1/C1 of pin and analog switch chip CD1 processed.Fig. 4 illustrates a kind of reality of level conversion unit 602
Apply the circuit diagram of mode.The level conversion unit 602 is provided with the 4th power end Vcc4, passes through two NPN triode Q1s, Q2
And multiple resistance realize level conversion.
In one embodiment, described first to third amplifier OP1~OP3 high-accuracy amplifier can be used, such as
LT1498CS8 chip.The analog switch chip CD1 can use CD4051 chip.
In one embodiment, the impedance conversion module 70 includes the 4th amplifier OP4 and the 16th resistance R16.Institute
The negative input end for stating the 4th amplifier OP4 is electrically connected to the output end of the third amplifier OP3, the 4th amplifier OP4
Output end be electrically connected to the positive input terminal and negative input end of the 4th amplifier OP4.The 16th resistance R16 electrical connection
Between the negative input end and output end of the 4th amplifier OP4.
In one embodiment, the division module 80 includes the 17th to the 20th resistance R17~R20.Described tenth
One end of seven resistance R17 is electrically connected to third power end Vcc3, and the other end of the 17th resistance R17 is electrically connected to described
The output end of one end of 18 resistance R18 and the 4th amplifier OP4, the other end ground connection of the 18th resistance R18.Institute
The one end for stating the 19th resistance R19 is electrically connected to the output end of the 4th amplifier OP4, and the 19th resistance R19's is another
One end is electrically connected to one end of the 20th resistance R20 and the other end ground connection of the MCU, the 20th resistance R20.Institute
The signal that MCU samples one end of the 20th resistance R20 is stated, detects amplified sensing signal to realize.Third power end
The voltage of Vcc3 can be set according to actual needs.
Above-mentioned signal amplification circuit and electronic device are amplified by the amplification module of a fixed gain with an AGC is unified
Module amplifies the sensing signal of air pressure probe, realizes and sensing signal is first amplified to measuring range, then into
Row gain control, the amplification module of the fixed gain can first amplify to AGC amplification module faint sensing signal
Measuring range so that the input voltage of AGC amplification module meets nominal input voltage requirement, while being adjusted automatically by controlling chip
The gain of whole AGC amplification module, so that the signal of air pressure probe is in reasonable amplitude range always after amplification,
Farthest reduce distorted signals.
It will be apparent to those skilled in the art that the reality of production can be combined with scheme of the invention according to the present invention and inventive concept
Border needs to make other and is altered or modified accordingly, and these change and adjustment all should belong to range disclosed in this invention.
Claims (10)
1. a kind of signal amplification circuit amplifies, which is characterized in that described for the sensing signal to air pressure probe
Signal amplification circuit includes:
Amplification module amplifies for the sensing signal to the air pressure probe and exports the first amplified signal,
Described in amplification module have a preset gain；
Gain controllable module is electrically connected to the amplification module, for be amplified and exported to first amplified signal
Two amplified signals；And
Control unit is electrically connected to the gain controllable module, puts for detecting second amplified signal, and by described second
Big signal is compared generation control signal with preset signals value；
Wherein, the gain controllable module is also used to carry out gain adjustment according to the control signal.
2. signal amplification circuit as described in claim 1, which is characterized in that the sensing signal of the air pressure probe is
AC signal, the signal amplification circuit further include the bias treatment module for being electrically connected to the amplification module, the air pressure
The sensing signal of force snesor exports after carrying out voltage bias processing by the bias treatment module to the amplification module.
3. signal amplification circuit as claimed in claim 2, which is characterized in that the bias treatment module includes:
First capacitor, one end are used to receive the sensing signal of the air pressure probe；
Transient supression diode, one end are electrically connected to one end of the first capacitor, other end ground connection；
First resistor, one end are electrically connected to the other end of the first capacitor, and the other end is electrically connected to a power end；And
Second resistance, one end are electrically connected to the common end of the first resistor Yu the first capacitor, other end ground connection.
4. signal amplification circuit as claimed in claim 2, which is characterized in that the amplification module include the first amplifying unit and
Second amplifying unit, first amplifying unit are used to carry out the amplification of the first preset gain, and second amplifying unit is used for
The amplification of the second preset gain is carried out, second preset gain is greater than first preset gain.
5. signal amplification circuit as claimed in claim 4, which is characterized in that first amplifying unit includes:
First amplifier, positive input terminal is for receiving the sensing signal；And
3rd resistor is electrically connected between the negative input end of first amplifier and the output end of first amplifier；
Second amplifying unit includes:
Second capacitor, one end are electrically connected to the output end of first amplifier；
4th resistance, one end are electrically connected to the other end of second capacitor；
Second amplifier, positive input terminal are electrically connected to one end of the 5th resistance and one end of the 6th resistance, negative input end electrical connection
In the other end of the 4th resistance, the other end of the 5th resistance is connected to a power end, the 6th resistance it is another
End ground connection；And
7th resistance is electrically connected between the negative input end of second amplifier and the output end of second amplifier.
6. signal amplification circuit as claimed in claim 2, which is characterized in that the gain controllable module includes:
Third capacitor, one end are electrically connected to the amplification module；
8th resistance, one end are electrically connected to the other end of the third capacitor；
Third amplifier, positive input terminal are electrically connected to the other end of the 8th resistance, and negative input end is electrically connected to the 9th resistance
One end and the tenth resistance one end, the other end of the 9th resistance is electrically connected to the other end of the 8th resistance, described
The other end of tenth resistance is grounded；
Analog switch chip, including the first to the 8th input, output end and first is to third control terminal, the analog switch core
The output end of piece is electrically connected to the output end of the third amplifier and the detecting pin of described control unit, the analog switch
The first of chip to third control terminal is electrically connected to the control pin of described control unit, the analog switch chip first to
8th input terminal is electrically connected in one end of a feedback resistance, and the other end of each feedback resistance is electrically connected to described
The positive input terminal of third amplifier, and each feedback resistance has different resistance values.
7. signal amplification circuit as claimed in claim 6, which is characterized in that further include level switch module, be electrically connected to institute
State control unit control pin and the analog switch chip first to third control terminal, the level switch module is used for
Level conversion is carried out to the control signal of the control pin output, by the control of the first level of the control pin output
Signal is converted into the control signal of second electrical level to the analog switch chip first to third control terminal, wherein described second
Level is greater than first level.
8. signal amplification circuit as claimed in claim 6, which is characterized in that further include analog-to-digital conversion module, the modulus turns
The input terminal of mold changing block is electrically connected to the output end of the analog switch chip and the output end of the third amplifier, the mould
The output end of number conversion modules is electrically connected to the detecting pin of described control unit, and the analog-to-digital conversion module is used for described the
The level signal of the output end of three amplifiers carries out analog-to-digital conversion, is drawn with the detecting of output digit signals to described control unit
Foot.
9. signal amplification circuit as described in claim 1, which is characterized in that further include being electrically connected to the gain controllable module
Impedance conversion module and division module；The impedance conversion module includes a voltage follower, for the gain controllable
Second amplified signal of module output carries out impedance conversion process；The division module, for defeated to the gain controllable module
The second amplified signal out carries out voltage division processing, and described control unit is also used to the second amplified signal after voltage division processing
It is sampled, to detect the sensing signal of the air pressure probe.
10. a kind of electronic device, which is characterized in that including such as described in any item signal amplification circuits of claim 1-9.
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