CN105763163A - Novel ultrahigh frequency weak signal combined amplification circuit - Google Patents
Novel ultrahigh frequency weak signal combined amplification circuit Download PDFInfo
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Abstract
The invention belongs to the field of on-line monitoring of electrical equipment ultrahigh frequency local discharging, and particularly relates to a novel ultrahigh frequency weak signal combined amplification circuit.The circuit comprises a signal end, a noise end, a differential noise-reducing pre-amplification circuit, a signal amplification circuit, a first biasing circuit, a second biasing circuit and an output end, the high-symmetry differential amplification circuit is adopted for the differential noise-reducing pre-amplification circuit to perform differential noise-reducing processing and signal amplifying on an input signal and a noise signal, and the noise end is placed at the position away from monitoring equipment, so that background noise is filtered away to the maximum; two-stage amplification design is adopted for the signal amplification circuit, the signal amplification factor of the first stage is 102-104, and the signal amplification factor of the second stage is 103-106; a filtering device is arranged in the circuit, so that a needed signal is amplified, and meanwhile the noise signal is reduced to the maximum; the measurement precision of the weak signal can reach the level of microamp and even reach the level of nanoampere.
Description
Technical field
The invention belongs to power equipment high-frequency local discharging on-line monitoring field, particularly to a kind of novel hyperfrequency small-signal combined amplifier.
Background technology
The maintenance mode of power equipment is changed to repair based on condition of component by Ge great Utilities Electric Co. of current China by periodic inspection, promptly and accurately grasps the running status of power equipment, and it is primary work that equipment carries out on-line monitoring.By equipment is carried out shelf depreciation on-line checking, quickly can grasp Electric Power Equipment Insulation state in time, reduce the blindness of maintenance of equipment test.The Observational frequency band of ultra-high-frequency detection method is generally 300MHz～3GHz, power equipment uses the corona discharge frequency band in background scene noise and air all at below 300MHz, can effectively evade the multiple electrical Interference such as the encountered corona of tradition Partial Discharge Detection means, switching manipulation, and the detection bandwidth of ultra-high-frequency detection method, highly sensitive, working stability, development rapidly and application is therefore obtained in recent years.
The subject matter encountered on Weak absorption of hyperfrequency weak signal amplification circuit of the prior art is that certainty of measurement is inadequate, even if can be measured that the electric current of mA level or other be with the high precision of magnitude physical quantity comparison, and capacity of resisting disturbance being more weak, reliability is relatively low.Therefore, the combined amplifier that a kind of certainty of measurement of offer is high, capacity of resisting disturbance is strong is needed badly.
Summary of the invention
The present invention is in order to overcome above-mentioned the deficiencies in the prior art, provide a kind of novel hyperfrequency small-signal combined amplifier, the Weak absorption precision of the present invention is up to μ A level or even nA level, and the present invention is also equipped with the feature that capacity of resisting disturbance is strong, reliability is high, can be mass.
For achieving the above object, present invention employs techniques below measure:
A kind of novel hyperfrequency small-signal combined amplifier, this combined amplifier includes signal end, noise end, difference noise abatement pre-amplification circuit, signal amplification circuit, the first biasing circuit, the second biasing circuit, outfan, wherein,
Signal end, noise end, be respectively used to introduce the signal source of monitored equipment, noise source, described signal end, noise end signal output part be all connected with the signal input part of difference noise abatement pre-amplification circuit；
Difference noise abatement pre-amplification circuit, for receiving respectively from signal end, the input signal of noise end, noise signal, and input signal and noise signal are carried out difference noise abatement process and signal amplification, the signal output part of described difference noise abatement pre-amplification circuit connects the signal input part of signal amplification circuit；
Signal amplification circuit, for the input signal coming from difference noise abatement pre-amplification circuit is carried out signal processing and amplifying, what monitoring was easy in the signal output part output of described signal amplification circuit outputs signal to outfan；
First biasing circuit, the second biasing circuit, be respectively used to for described difference noise abatement pre-amplification circuit, signal amplification circuit provide normal operating conditions voltage, described first biasing circuit, the second biasing circuit signal output part connect the signal input part of difference noise abatement pre-amplification circuit, signal amplification circuit respectively.
nullPreferably，Described difference noise abatement pre-amplification circuit includes the first operational amplifier and the second operational amplifier，The negative signal input of described first operational amplifier connects input signal、First electric capacity、And first one end of resistance，The positive signal input of the first operational amplifier connects the first port of the first biasing circuit，The signal output part of described first operational amplifier connects the first electric capacity、The other end of the first resistance and one end of the second electric capacity，The other end of described second electric capacity connects one end of the second resistance and the positive signal input of the 3rd operational amplifier，The other end ground connection of described second resistance，The negative signal input of described 3rd operational amplifier connects the second port of the first biasing circuit，The signal output part of the 3rd operational amplifier connects the 3rd port of the first biasing circuit and the positive signal input of the 5th differential amplifier，The signal output part of described 5th differential amplifier connects the signal input part of signal amplification circuit；
The negative signal input of described second operational amplifier connects noise signal, 3rd electric capacity, and the 7th one end of resistance, the positive signal input of the second operational amplifier connects the 4th port of the first biasing circuit, the signal output part of described second operational amplifier connects the 3rd electric capacity, the other end of the 7th resistance and one end of the 4th electric capacity, the other end of described 4th electric capacity connects one end of the 8th resistance and the positive signal input of four-operational amplifier, the other end ground connection of described 8th resistance, the negative signal input of described four-operational amplifier connects the fifth port of the first biasing circuit, the signal output part of four-operational amplifier connects the 6th port of the first biasing circuit and the negative signal input of the 5th differential amplifier.
nullPreferably，Described signal amplification circuit includes the 6th operational amplifier and the 7th operational amplifier，The negative signal input of described 6th operational amplifier connects the 13rd resistance、14th resistance、One end of 5th electric capacity，The other end of described 13rd resistance connects the signal output part of the 5th differential amplifier，The positive signal input of described 6th operational amplifier connects the first port of the second biasing circuit，The signal output part of described 6th operational amplifier connects the 5th electric capacity、The other end of the 14th resistance and one end of the 15th resistance，The other end of described 15th resistance connects the positive signal input of the 7th operational amplifier，The negative signal input of described 7th operational amplifier connects one end of the tenth electric capacity，The signal output part of the 7th operational amplifier connects the other end of the tenth electric capacity and one end of the 19th resistance，The other end of described 19th resistance connects the second port of the second biasing circuit，7th operational amplifier signal output part output be easy to monitoring output signal to outfan；
The negative electricity source of described 6th operational amplifier connects the negative pole of the first power supply and one end of the 6th electric capacity, the positive electrical source of described 7th operational amplifier connects the positive pole of second source and one end of the 7th electric capacity, the positive pole of described first power supply, the other end of the 6th electric capacity, the negative pole of second source, the 7th electric capacity the equal ground connection of the other end；The positive electrical source of described 6th operational amplifier connects the positive pole of the 3rd power supply and one end of the 8th electric capacity, the negative electricity source of described 7th operational amplifier connects the negative pole of the 4th power supply and one end of the 9th electric capacity, the negative pole of described 3rd power supply, the other end of the 8th electric capacity, the positive pole of the 4th power supply, the 9th electric capacity the equal ground connection of the other end.
Preferably, described first biasing circuit includes the 3rd resistance, 4th resistance, 5th resistance, 6th adjustable resistance, 9th resistance, tenth resistance, 11st resistance, 12nd adjustable resistance, one end ground connection of described 3rd resistance, the other end of the 3rd resistance connects the positive signal input of the first operational amplifier, and the 4th one end of resistance, the other end of described 4th resistance connects the positive pole of the first bias supply, one end of 5th resistance, the minus earth of described first bias supply, the other end of described 5th resistance connects the negative signal input of the 3rd operational amplifier, and the 6th one end of adjustable resistance, the other end of described 6th adjustable resistance connects the signal output part of the 3rd operational amplifier, and the 5th positive signal input of differential amplifier；
One end ground connection of described 9th resistance, the other end of the 9th resistance connects the positive signal input of the second operational amplifier, and the tenth one end of resistance, the other end of described tenth resistance connects the positive pole of the second bias supply, one end of 11st resistance, the minus earth of described second bias supply, the other end of described 11st resistance connects the negative signal input of four-operational amplifier, and the 12nd one end of adjustable resistance, the other end of described 12nd adjustable resistance connects the signal output part of four-operational amplifier, and the 5th negative signal input of differential amplifier.
Preferably, described second biasing circuit includes the 16th resistance, the 17th resistance, the 18th resistance, one end ground connection of described 16th resistance, the other end of the 16th resistance connects the positive signal input of the 6th operational amplifier and one end of the 17th resistance, the other end of described 17th resistance connects one end of the positive pole of the 3rd bias supply, the 18th resistance, the minus earth of described 3rd bias supply, the other end of described 18th resistance connects the other end of the 19th resistance.
Further, described first operational amplifier, the second operational amplifier, the 3rd operational amplifier, four-operational amplifier, the 6th operational amplifier, the 7th operational amplifier model be American TI Company produce OPA627 operational amplifier, the model of described 5th differential amplifier be American TI Company produce INA129 differential amplifier.
Further, all components and parts in described difference noise abatement pre-amplification circuit, signal amplification circuit are all detachably secured in supporting plate, and described supporting plate is nested in insulated support.
Further, this combined amplifier is sealed in metal shielding box.
Further, described noise end is placed in 5～10m place around distance monitored equipment.
Further, the signal amplification factor of described difference noise abatement pre-amplification circuit is 101～102Times, the signal amplification factor of described signal amplification circuit is 105～1010Times.
The beneficial effects of the present invention is:
1), circuit of the present invention includes signal end, noise end, difference noise abatement pre-amplification circuit, signal amplification circuit, the first biasing circuit, the second biasing circuit, outfan, described difference noise abatement pre-amplification circuit adopts high symmetric differential amplifier circuit that input signal and noise signal are carried out difference noise abatement process and signal amplifies, again described noise end is placed in 5～10m place around distance monitored equipment, makes background noise filter substantially；Described signal amplification circuit adopts the design that two-stage is amplified, and the signal amplification factor of the first order is 102～104, the signal amplification factor of the second level is 103～106, and circuit is provided with filter, it is ensured that while desired signal is amplified, noise signal is preferably minimized, and the Weak absorption precision of the present invention is up to μ A level or even nA level.
2), abandon traditional integrated plated circuit, difference noise abatement pre-amplification circuit in the present invention, all components and parts in signal amplification circuit are all detachably secured in supporting plate, described supporting plate is nested in insulated support, it is effectively improved the safety and reliability of whole combined amplifier, the present invention is subject to the phenomenon that the interference of extraneous factor is not susceptible to damage in the presence of a harsh environment, the present invention is also convenient for installing/dismounting and the maintenance of components and parts, greatly reduce in combined amplifier interfering and the error that causes between each element, add the precision of signal transmission；Adopt the welding connection of direct wire between element, and this combined amplifier is sealed in metal shielding box, greatly shields the interference of outer signals.
3) the first power supply, in described signal amplification circuit and second source, being connected also by polarity inversion between the 3rd power supply and the 4th power supply, error drift voltage caused is preferably minimized, and makes the monitoring waveform finally obtained be more prone to identify；6th adjustable resistance of setting, the 12nd adjustable resistance in described difference noise abatement pre-amplification circuit, it is possible to according to operational amplifier, the needs of bias voltage are adjusted at any time the size of resistance, facilitates the adjustment to signal times magnification of this combined amplifier.
Accompanying drawing explanation
Fig. 1 is principles of the invention block diagram；
Fig. 2 is the circuit theory diagrams of the difference noise abatement pre-amplification circuit of the present invention, the first biasing circuit；
Fig. 3 is the circuit theory diagrams of the signal amplification circuit of the present invention, the second biasing circuit.
Accompanying drawing labelling implication in figure is as follows:
10 difference noise abatement pre-amplification circuit 20 signal amplification circuits
30 first biasing circuit 40 second biasing circuits
AMP1～AMP7 the first operational amplifier～the 7th operational amplifier
C1～C10 the first electric capacity～the tenth electric capacity
R1～R5 the first resistance～the 5th resistance
R7～R11 the first resistance～the 11st resistance
R13～R19 the first resistance～the 19th resistance
R6 the 6th adjustable resistance R12 the 12nd adjustable resistance
VCC1～VCC4 the first power supply～the 4th power supply
Vf1～Vf3 the first bias supply～the 3rd bias supply
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
nullAs shown in Figure 1，This combined amplifier includes signal end、Noise end、Difference noise abatement pre-amplification circuit 10、Signal amplification circuit 20、First biasing circuit 30、Second biasing circuit 40、Outfan，Described signal end、Noise end is respectively used to introduce the signal source of monitored equipment、Noise source，Described signal end、The signal output part of noise end is all connected with the signal input part of difference noise abatement pre-amplification circuit 10，The signal output part of described difference noise abatement pre-amplification circuit 10 connects the signal input part of signal amplification circuit 20，Described first biasing circuit 30、The signal output part of the second biasing circuit 40 connects difference noise abatement pre-amplification circuit 10 respectively、The signal input part of signal amplification circuit 20，Described signal amplification circuit 20 signal output part output be easy to monitoring output signal to outfan.
nullAs shown in Figure 2，Described difference noise abatement pre-amplification circuit 10 includes the first operational amplifier A MP1 and the second operational amplifier A MP2，The negative signal input of described first operational amplifier A MP1 connects input signal、First electric capacity C1、And first one end of resistance R1，The positive signal input of the first operational amplifier A MP1 connects the first port of the first biasing circuit 30，The signal output part of described first operational amplifier A MP1 connects the first electric capacity C1、The other end of the first resistance R1 and one end of the second electric capacity C2，The other end of described second electric capacity C2 connects one end of the second resistance R2 and the positive signal input of the 3rd operational amplifier A MP3，The other end ground connection of described second resistance R2，The negative signal input of described 3rd operational amplifier A MP3 connects the second port of the first biasing circuit 30，The signal output part of the 3rd operational amplifier A MP3 connects the 3rd port of the first biasing circuit 30 and the positive signal input of the 5th differential amplifier A MP5，The signal output part of described 5th differential amplifier A MP5 connects the signal input part of signal amplification circuit 20；
nullThe negative signal input of described second operational amplifier A MP2 connects noise signal、3rd electric capacity C3、And the 7th one end of resistance R7，The positive signal input of the second operational amplifier A MP2 connects the 4th port of the first biasing circuit 30，The signal output part of described second operational amplifier A MP2 connects the 3rd electric capacity C3、The other end of the 7th resistance R7 and one end of the 4th electric capacity C4，The other end of described 4th electric capacity C4 connects one end of the 8th resistance R8 and the positive signal input of four-operational amplifier AMP4，The other end ground connection of described 8th resistance R8，The negative signal input of described four-operational amplifier AMP4 connects the fifth port of the first biasing circuit 30，The signal output part of four-operational amplifier AMP4 connects the 6th port of the first biasing circuit 30 and the negative signal input of the 5th differential amplifier A MP5.
nullAs shown in Figure 2，Described first biasing circuit 30 includes the 3rd resistance R3、4th resistance R4、5th resistance R5、6th adjustable resistance R6、9th resistance R9、Tenth resistance R10、11st resistance R11、12nd adjustable resistance R12，One end ground connection of described 3rd resistance R3，The other end of the 3rd resistance R3 connects the positive signal input of the first operational amplifier A MP1、And the 4th one end of resistance R4，The other end of described 4th resistance R4 connects the positive pole of the first bias supply Vf1、One end of 5th resistance R5，The minus earth of described first bias supply Vf1，The other end of described 5th resistance R5 connects the negative signal input of the 3rd operational amplifier A MP3、And the 6th one end of adjustable resistance R6，The other end of described 6th adjustable resistance R6 connects the signal output part of the 3rd operational amplifier A MP3、And the 5th positive signal input of differential amplifier A MP5；
One end ground connection of described 9th resistance R9, the other end of the 9th resistance R9 connects the positive signal input of the second operational amplifier A MP2, and the tenth one end of resistance R10, the other end of described tenth resistance R10 connects the positive pole of the second bias supply Vf2, one end of 11st resistance R11, the minus earth of described second bias supply Vf2, the other end of described 11st resistance R11 connects the negative signal input of four-operational amplifier AMP4, and the 12nd one end of adjustable resistance R12, the other end of described 12nd adjustable resistance R12 connects the signal output part of four-operational amplifier AMP4, and the 5th negative signal input of differential amplifier A MP5.
nullAs shown in Figure 3，Described signal amplification circuit 20 includes the 6th operational amplifier A MP6 and the seven operational amplifier A MP7，The negative signal input of described 6th operational amplifier A MP6 connects the 13rd resistance R13、14th resistance R14、One end of 5th electric capacity C5，The other end of described 13rd resistance R13 connects the signal output part of the 5th differential amplifier A MP5，The positive signal input of described 6th operational amplifier A MP6 connects the first port of the second biasing circuit 40，The signal output part of described 6th operational amplifier A MP6 connects the 5th electric capacity C5、The other end of the 14th resistance R14 and one end of the 15th resistance R15，The other end of described 15th resistance R15 connects the positive signal input of the 7th operational amplifier A MP7，The negative signal input of described 7th operational amplifier A MP7 connects one end of the tenth electric capacity C10，The signal output part of the 7th operational amplifier A MP7 connects the other end of the tenth electric capacity C10 and one end of the 19th resistance R19，The other end of described 19th resistance R19 connects the second port of the second biasing circuit 40，7th operational amplifier A MP7 signal output part output be easy to monitoring output signal to outfan；
The negative electricity source of described 6th operational amplifier A MP6 connects the negative pole of the first power supply VCC1 and one end of the 6th electric capacity C6, the positive electrical source of described 7th operational amplifier A MP7 connects the positive pole of second source VCC2 and one end of the 7th electric capacity C7, the positive pole of described first power supply VCC1, the other end of the 6th electric capacity C6, the negative pole of second source VCC2, the 7th electric capacity C7 the equal ground connection of the other end；The positive electrical source of described 6th operational amplifier A MP6 connects the positive pole of the 3rd power supply VCC3 and one end of the 8th electric capacity C8, the negative electricity source of described 7th operational amplifier A MP7 connects the negative pole of the 4th power supply VCC4 and one end of the 9th electric capacity C9, the negative pole of described 3rd power supply VCC3, the other end of the 8th electric capacity C8, the positive pole of the 4th power supply VCC4, the 9th electric capacity C9 the equal ground connection of the other end.
As shown in Figure 3, described second biasing circuit 40 includes the 16th resistance R16, the 17th resistance R17, the 18th resistance R18, one end ground connection of described 16th resistance R16, the other end of the 16th resistance R16 connects the positive signal input of the 6th operational amplifier A MP6 and one end of the 17th resistance R17, the other end of described 17th resistance R17 connects one end of the positive pole of the 3rd bias supply Vf3, the 18th resistance R18, the minus earth of described 3rd bias supply Vf3, the other end of described 18th resistance R18 connects the other end of the 19th resistance R19.
Detailed description below the preferred embodiments of the present invention, as shown in Figure 2, choose the second resistance R2, the resistance value of the 8th resistance R8 is sized to R2=R8=1k Ω, second electric capacity C2, the 4th electric capacity C4 capacitance be sized to C2=C4=0.53052pF, for realizing preliminary high-pass filtering, will be less than the harmonic wave of 300MHz and background noise filters；Choose the first resistance R1, the resistance value of the 7th resistance R7 is sized to R1=R7=100 Ω, the first electric capacity C1, the 3rd electric capacity C3 capacitance be sized to C1=C3=1.592pF, be used for realizing low-pass filtering, the harmonic wave more than 1GHz and other noises further filtered out；The cut-off frequency of low-pass filtering and high-pass filtering is by formulaDetermine；
Described first operational amplifier A MP1, the second operational amplifier A MP2, the 3rd operational amplifier A MP3, four-operational amplifier AMP4 the model OPA627 operational amplifier that all adopts American TI Company to produce.
First biasing circuit 30 adopts two bias supplies, first operational amplifier A MP1, the 3rd operational amplifier A MP3 are provided the bias voltage of steady-working state by respectively the first bias supply Vf1, the second bias supply Vf2, described first bias supply Vf1 by divider resistance the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th adjustable resistance R6；Second operational amplifier A MP2, four-operational amplifier AMP4 are provided the bias voltage of steady-working state by described second bias supply Vf2 by divider resistance the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the 12nd adjustable resistance R12；In order to not affect the normal operation of circuit while providing bias voltage, bias voltage impact is eliminated by the size regulating divider resistance, makes a concrete analysis of as follows:
By superposition theorem, respectively measured signal gain amplifier and bias voltage gain amplifier are analyzed, for the latter half of difference channel, as in figure 2 it is shown, the gain amplifier of signal is as follows,
By V can be releasedo1=IinR7
Therefore, Vb=Vo1, again,
Bias voltage gain amplifier is as follows,
It follows that
To sum up can obtaining, the global voltage output function of the latter half of difference channel is:
Namely R is worked as5R7-R6R8When=0, the gain of bias voltage can eliminate, the desirable R of this example5=R6=R7=R8, obtaining the gain before differential amplification is 200 times.
The model of afterbody the 5th differential amplifier A MP5 is the INA129 differential amplifier that American TI Company produces, its amplification amplification resistance R within the 5th differential amplifier A MP5GDetermine, this example RGChoose 49.4k Ω, then in this example, the amplification of the difference noise abatement pre-amplification circuit of Part I is 4 × 102。
Described signal amplification circuit 20 is made up of 2 grades of amplifying circuits, and two-stage is scaling circuit, but gain size is different, and the less error being easy to cause noise of prime amplification reduces as much as possible, and prime amplification is typically in 10～103Between, rear class amplification is typically in 104～105Between, regulate filter range by feedback capacity the 5th electric capacity C5, the tenth electric capacity C10 simultaneously and reduce self-excitation, it is connected also by polarity inversion between the first power supply VCC1 and second source VCC2, the 3rd power supply VCC3 and the four power supply VCC4 in described signal amplification circuit 20, error drift voltage caused is preferably minimized so that the monitoring waveform finally obtained is more prone to identify.In this example, the amplification choosing the 6th operational amplifier A MP6 is 102Times, the amplification of the 6th operational amplifier A MP6 is 104Times, the overall amplification of described signal amplification circuit 20 is 106Times, in conjunction with difference noise abatement pre-amplification circuit 10, the signal amplification factor of the present invention is 4 × 108Times.
Claims (10)
1. hyperfrequency small-signal combined amplifier one kind novel, it is characterized in that: this combined amplifier includes signal end, noise end, difference noise abatement pre-amplification circuit (10), signal amplification circuit (20), the first biasing circuit (30), the second biasing circuit (40), outfan, wherein
Signal end, noise end, be respectively used to introduce the signal source of monitored equipment, noise source, described signal end, noise end signal output part be all connected with the signal input part of difference noise abatement pre-amplification circuit (10)；
Difference noise abatement pre-amplification circuit (10), for receiving respectively from signal end, the input signal of noise end, noise signal, and input signal and noise signal are carried out difference noise abatement process and signal amplification, the signal output part of described difference noise abatement pre-amplification circuit (10) connects the signal input part of signal amplification circuit (20)；
Signal amplification circuit (20), for the input signal coming from difference noise abatement pre-amplification circuit (10) carries out signal processing and amplifying, what monitoring was easy in the output of the signal output part of described signal amplification circuit (20) outputs signal to outfan；
First biasing circuit (30), the second biasing circuit (40), be respectively used to for described difference noise abatement pre-amplification circuit (10), signal amplification circuit (20) provide normal operating conditions voltage, described first biasing circuit (30), the second biasing circuit (40) signal output part connect the signal input part of difference noise abatement pre-amplification circuit (10), signal amplification circuit (20) respectively.
null2. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 1，It is characterized in that: described difference noise abatement pre-amplification circuit (10) includes the first operational amplifier (AMP1) and the second operational amplifier (AMP2)，The negative signal input of described first operational amplifier (AMP1) connects input signal、First electric capacity (C1)、And first one end of resistance (R1)，The positive signal input of the first operational amplifier (AMP1) connects the first port of the first biasing circuit (30)，The signal output part of described first operational amplifier (AMP1) connects the first electric capacity (C1)、The other end of the first resistance (R1) and one end of the second electric capacity (C2)，The other end of described second electric capacity (C2) connects one end of the second resistance (R2) and the positive signal input of the 3rd operational amplifier (AMP3)，The other end ground connection of described second resistance (R2)，The negative signal input of described 3rd operational amplifier (AMP3) connects the second port of the first biasing circuit (30)，The signal output part of the 3rd operational amplifier (AMP3) connects the 3rd port of the first biasing circuit (30) and the positive signal input of the 5th differential amplifier (AMP5)，The signal output part of described 5th differential amplifier (AMP5) connects the signal input part of signal amplification circuit (20)；
nullThe negative signal input of described second operational amplifier (AMP2) connects noise signal、3rd electric capacity (C3)、And the 7th one end of resistance (R7)，The positive signal input of the second operational amplifier (AMP2) connects the 4th port of the first biasing circuit (30)，The signal output part of described second operational amplifier (AMP2) connects the 3rd electric capacity (C3)、The other end of the 7th resistance (R7) and one end of the 4th electric capacity (C4)，The other end of described 4th electric capacity (C4) connects one end of the 8th resistance (R8) and the positive signal input of four-operational amplifier (AMP4)，The other end ground connection of described 8th resistance (R8)，The negative signal input of described four-operational amplifier (AMP4) connects the fifth port of the first biasing circuit (30)，The signal output part of four-operational amplifier (AMP4) connects the 6th port of the first biasing circuit (30) and the negative signal input of the 5th differential amplifier (AMP5).
null3. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 2，It is characterized in that: described signal amplification circuit (20) includes the 6th operational amplifier (AMP6) and the 7th operational amplifier (AMP7)，The negative signal input of described 6th operational amplifier (AMP6) connects the 13rd resistance (R13)、14th resistance (R14)、One end of 5th electric capacity (C5)，The other end of described 13rd resistance (R13) connects the signal output part of the 5th differential amplifier (AMP5)，The positive signal input of described 6th operational amplifier (AMP6) connects the first port of the second biasing circuit (40)，The signal output part of described 6th operational amplifier (AMP6) connects the 5th electric capacity (C5)、The other end of the 14th resistance (R14) and one end of the 15th resistance (R15)，The other end of described 15th resistance (R15) connects the positive signal input of the 7th operational amplifier (AMP7)，The negative signal input of described 7th operational amplifier (AMP7) connects one end of the tenth electric capacity (C10)，The signal output part of the 7th operational amplifier (AMP7) connects the other end of the tenth electric capacity (C10) and one end of the 19th resistance (R19)，The other end of described 19th resistance (R19) connects the second port of the second biasing circuit (40)，7th operational amplifier (AMP7) signal output part output be easy to monitoring output signal to outfan；
The negative electricity source of described 6th operational amplifier (AMP6) connects the negative pole of the first power supply (VCC1) and one end of the 6th electric capacity (C6), the positive electrical source of described 7th operational amplifier (AMP7) connects the positive pole of second source (VCC2) and one end of the 7th electric capacity (C7), the positive pole of described first power supply (VCC1), the other end of the 6th electric capacity (C6), the negative pole of second source (VCC2), the 7th electric capacity (C7) the equal ground connection of the other end；The positive electrical source of described 6th operational amplifier (AMP6) connects the positive pole of the 3rd power supply (VCC3) and one end of the 8th electric capacity (C8), the negative electricity source of described 7th operational amplifier (AMP7) connects the negative pole of the 4th power supply (VCC4) and one end of the 9th electric capacity (C9), the negative pole of described 3rd power supply (VCC3), the other end of the 8th electric capacity (C8), the positive pole of the 4th power supply (VCC4), the 9th electric capacity (C9) the equal ground connection of the other end.
null4. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 2，It is characterized in that: described first biasing circuit (30) includes the 3rd resistance (R3)、4th resistance (R4)、5th resistance (R5)、6th adjustable resistance (R6)、9th resistance (R9)、Tenth resistance (R10)、11st resistance (R11)、12nd adjustable resistance (R12)，One end ground connection of described 3rd resistance (R3)，The other end of the 3rd resistance (R3) connects the positive signal input of the first operational amplifier (AMP1)、And the 4th one end of resistance (R4)，The other end of described 4th resistance (R4) connects the positive pole of the first bias supply (Vf1)、One end of 5th resistance (R5)，The minus earth of described first bias supply (Vf1)，The other end of described 5th resistance (R5) connects the negative signal input of the 3rd operational amplifier (AMP3)、And the 6th one end of adjustable resistance (R6)，The other end of described 6th adjustable resistance (R6) connects the signal output part of the 3rd operational amplifier (AMP3)、And the 5th positive signal input of differential amplifier (AMP5)；
One end ground connection of described 9th resistance (R9), the other end of the 9th resistance (R9) connects the positive signal input of the second operational amplifier (AMP2), and the tenth one end of resistance (R10), the other end of described tenth resistance (R10) connects the positive pole of the second bias supply (Vf2), one end of 11st resistance (R11), the minus earth of described second bias supply (Vf2), the other end of described 11st resistance (R11) connects the negative signal input of four-operational amplifier (AMP4), and the 12nd one end of adjustable resistance (R12), the other end of described 12nd adjustable resistance (R12) connects the signal output part of four-operational amplifier (AMP4), and the 5th negative signal input of differential amplifier (AMP5).
5. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 3, it is characterized in that: described second biasing circuit (40) includes the 16th resistance (R16), 17th resistance (R17), 18th resistance (R18), one end ground connection of described 16th resistance (R16), the other end of the 16th resistance (R16) connects the positive signal input of the 6th operational amplifier (AMP6), and the 17th one end of resistance (R17), the other end of described 17th resistance (R17) connects the positive pole of the 3rd bias supply (Vf3), one end of 18th resistance (R18), the minus earth of described 3rd bias supply (Vf3), the other end of described 18th resistance (R18) connects the other end of the 19th resistance (R19).
6. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 3, it is characterized in that: described first operational amplifier (AMP1), the second operational amplifier (AMP2), the 3rd operational amplifier (AMP3), four-operational amplifier (AMP4), the 6th operational amplifier (AMP6), the 7th operational amplifier (AMP7) model be American TI Company produce OPA627 operational amplifier, the model of described 5th differential amplifier (AMP5) be American TI Company produce INA129 differential amplifier.
7. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 3, it is characterized in that: all components and parts in described difference noise abatement pre-amplification circuit (10), signal amplification circuit (20) are all detachably secured in supporting plate, and described supporting plate is nested in insulated support.
8. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 7, it is characterised in that: this combined amplifier is sealed in metal shielding box.
9. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 1, it is characterised in that: described noise end is placed in 5～10m place around distance monitored equipment.
10. a kind of novel hyperfrequency small-signal combined amplifier as claimed in claim 1, it is characterised in that: the signal amplification factor of described difference noise abatement pre-amplification circuit (10) is 101～102Times, the signal amplification factor of described signal amplification circuit (20) is 105～1010Times.
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| CN111208569A (en) * | 2020-01-16 | 2020-05-29 | 苏州工业职业技术学院 | Hydrophone |
| CN117192226A (en) * | 2023-08-11 | 2023-12-08 | 武汉大学 | Weak electromagnetic wave signal detection system |
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| CN105763163B (en) | 2018-07-03 |
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