CN109067367A - A kind of hall signal amplifying circuit - Google Patents
A kind of hall signal amplifying circuit Download PDFInfo
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- CN109067367A CN109067367A CN201811088232.1A CN201811088232A CN109067367A CN 109067367 A CN109067367 A CN 109067367A CN 201811088232 A CN201811088232 A CN 201811088232A CN 109067367 A CN109067367 A CN 109067367A
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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
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/42—Amplifiers with two or more amplifying elements having their dc paths in series with the load, the control electrode of each element being excited by at least part of the input signal, e.g. so-called totem-pole amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45026—One or more current sources are added to the amplifying transistors in the differential amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45031—Indexing scheme relating to differential amplifiers the differential amplifier amplifying transistors are compositions of multiple transistors
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Abstract
The invention discloses a kind of hall signal amplifying circuits, including the Hall sensor module connected to power supply, first amplifier, second amplifier, third amplifier, compensating module, the non-inverting input terminal connection of the first output end and the first amplifier of Hall sensor module, the second output terminal of Hall sensor module is connected with the inverting input terminal of the first amplifier, the in-phase output end of first amplifier is connect with the non-inverting input terminal of the in-phase output end of the second amplifier and third amplifier respectively, the reversed-phase output of first amplifier is connect with the inverting input terminal of the reversed-phase output of the second amplifier and third amplifier respectively, first output end of compensating module is connect with the non-inverting input terminal of the second amplifier, the second output terminal of compensating module is connect with the inverting input terminal of the second amplifier.The present invention generates equivalent input noise voltage relevant to thermal voltage by compensating module, while eliminating offset voltage, has good temperature compensation function.
Description
Technical field
The present invention relates to amplifier regions, more particularly to a kind of hall signal amplifying circuit.
Background technique
It during amplifying to hall signal, is influenced by offset voltage, quiescent output voltage (zero magnetic field conditions
Under) not in midpoint potential, to influence its application in high-precision speed detection sensor, position-detection sensor.For
Reduce the influence of offset voltage, traditional hall signal amplifying circuit is generally using instrument amplification shown in referring to Fig.1
Device structure, including the Hall sensor module 01 for exporting hall signal, the first operational amplifier OPA1, the second operation amplifier
Device OPA2, third operational amplifier OPA3, first resistor, second resistance is until the 7th resistance, wherein first resistor is denoted as R0, the
Two resistance are identical with 3rd resistor, are denoted as R01, the 4th resistance and the 5th resistance are identical, are denoted as R02, the 6th resistance and the 7th
Resistance is identical, is denoted as R03Though this symmetrical structure can reduce the influence of offset voltage to a certain extent, can not
Completely eliminate offset voltage.In order to achieve the effect that offset offset voltage, which ties herein
It further include adjustment module 02 on the basis of structure, for adjusting reference voltage VREFSize, to offset the shadow of offset voltage
It rings, but the offset voltage in hall signal amplifying circuit can also vary with temperature and change, it is contemplated that amplifier imbalance electricity
Press the thermal voltage V in temperature coefficient and the amplifying circuitTIt is related, it is difficult to it is offset by the temperature coefficient of independent resistance, because
This, there is no good effect temperature compensation, nothings to the offset voltage in Hall amplifying circuit for scheme in the prior art
Method guarantees that quiescent output voltage has very high precision in total temperature working range.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art need to solve at present
Problem.
Summary of the invention
The object of the present invention is to provide a kind of hall signal amplifying circuits, are generated by compensating module relevant to thermal voltage
Equivalent input noise voltage has good temperature compensation function while eliminating offset voltage, keeps Static output electric
Being pressed in total temperature working range has very high precision.
In order to solve the above technical problems, the present invention provides a kind of hall signal amplifying circuits, including what is connected to power supply
Hall sensor module, the first amplifier, the second amplifier identical with first amplifier architecture, third amplifier are mended
Repay module, in which:
First output end of the Hall sensor module is connected with the non-inverting input terminal of first amplifier, it is described suddenly
You connect the second output terminal of sensor module with the inverting input terminal of first amplifier, the same phase of first amplifier
Output end is connect with the non-inverting input terminal of the in-phase output end of second amplifier and the third amplifier respectively, and described
The reversed-phase output of one amplifier is defeated with the reverse phase of the reversed-phase output of second amplifier and the third amplifier respectively
Enter end connection, the first output end of the compensating module is connect with the non-inverting input terminal of second amplifier, the compensation mould
The second output terminal of block is connect with the inverting input terminal of second amplifier；
The compensating module, for determining reference current relevant to thermal voltage, and according to the reference current and acquisition
Input offset voltage, obtain and the input offset voltage is equal in magnitude, polarity is opposite and relevant with the thermal voltage etc.
Input offset voltage is imitated, and the equivalent input noise voltage is exported to second amplifier.
Preferably, the compensating module includes first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
The first transistor, second transistor, third transistor, the 4th transistor, the 5th transistor, the 6th transistor, the 7th transistor,
8th transistor, the 9th transistor, the first fusible link, the second fusible link, in which:
The first end of the first resistor first end with the first end of the 3rd resistor and the 4th resistance respectively
Connection, common end connect with the power supply, the second end of the first resistor respectively with the first end of the first transistor,
The control terminal of the first transistor and the connection of the control terminal of the second transistor, the second end difference of the first transistor
It is connected with the control terminal of the first end of the third transistor and the 4th transistor, the control terminal point of the third transistor
The other second end with the first end of the 4th transistor and the second transistor connects, the second end of the 4th transistor
Connected with the first end of the second resistance, the first end of the second transistor respectively with the 5th transistor first
End, the connection of the control terminal of the 7th transistor, the control terminal of the 8th transistor, the control terminal of the 9th transistor,
The second end of 5th transistor is connect with the second end of the 3rd resistor, the control terminal of the 5th transistor respectively and
The second end of 7th transistor and the control terminal connection of the 6th transistor, the second end of the 6th transistor and institute
State the 4th resistance second end connection, the first end of the 6th transistor respectively with the second end of the 8th transistor and institute
State the 9th transistor second end connection, the first end of the 8th transistor respectively with the first end of the 5th resistance and institute
State the first end connection of the first fusible link, second output terminal of the common end as the compensating module, the 9th transistor
First end connect respectively with the first end of the second end of the 5th resistance and the second resistance silk, common end is as institute
State the first output end of compensating module, the second end of the third transistor, the first end of the 7th transistor and described
The second end of two resistance is grounded；
The compensating module further includes connecting respectively with the 5th resistance, first fusible link and second fusible link
It connects, for adjusting the resistance value of the 5th resistance to control the 5th ohmically voltage and the input offset voltage size
Fusing that is equal, being also used to control first fusible link and second fusible link is to control the equivalent input noise voltage
With the opposite polarity control unit of the input offset voltage；
The second resistance is identical as the 3rd resistor, the 4th resistance, the type of the 5th resistance.
Preferably, first amplifier is the first trsanscondutance amplifier, and second amplifier is the second trsanscondutance amplifier；
The then hall signal amplifying circuit further include:
The 6th electricity that first end is connect with the in-phase output end of first trsanscondutance amplifier, second end and AC deposition connect
Resistance；
The 7th electricity that first end is connect with the reversed-phase output of second trsanscondutance amplifier, second end and AC deposition connect
Resistance.
Preferably, first trsanscondutance amplifier and second trsanscondutance amplifier include the 8th resistance, the 9th resistance
Until thirteenth resistor, the tenth transistor, the 11st transistor is until the 25th transistor, in which:
The first end of 8th resistance respectively with the first end of the tenth resistance, the first end of eleventh resistor and the 12nd
The first end of resistance connects, and common end is connect with the power supply, and the second end of the 8th resistance is brilliant with the described tenth respectively
The control terminal of the first end of body pipe, the control terminal of the tenth transistor and the 11st transistor connects, and the described tenth is brilliant
The second end of body pipe is connect with the control terminal of the first end of the tenth two-transistor and the 13rd transistor respectively, and the described 12nd is brilliant
The control terminal of body pipe is connect with the second end of the first end of the 13rd transistor and the 11st transistor respectively, described
The second end of 13rd transistor is connect with the first end of the 9th resistance, the first end of the 11st transistor respectively with
The control terminal of 15th transistor and the connection of the first end of the 14th transistor, the second end of the 14th transistor with it is described
The second end of tenth resistance connects, the control terminal of the 14th transistor respectively with the second end of the 15th transistor and
The control terminal of the control terminal of 16th transistor, the control terminal of the 17th transistor and the 18th transistor connects, and the described tenth
The second end of six transistors is connect with the second end of the eleventh resistor, and the first end of the 16th transistor is respectively with
The first end of 19 transistors, the control terminal of the 19th transistor, the control terminal of the 20th transistor and the 21st are brilliant
The control terminal of body pipe connects, the second end of the 17th transistor respectively with the second end of the 18th transistor and described
The second end of twelfth resistor connects, the first end of the 17th transistor respectively with the first end of the 20th two-transistor and
The control terminal of 24th transistor connects, the first end of the 18th transistor respectively with the 23rd transistor first
The connection of the control terminal of end and the 25th transistor, the second end of the 20th two-transistor is respectively with the described 13rd
The first end of the first end of resistance, the first end of the 24th transistor and the 20th transistor connects, and described the
Non-inverting input terminal of the control terminal of 20 two-transistors as first trsanscondutance amplifier and second trsanscondutance amplifier, institute
State the second end of the 23rd transistor respectively with the first end of the 25th transistor, the thirteenth resistor second
The connection of the first end of end and the 21st transistor, the control terminal of the 23rd transistor is as first mutual conductance
The inverting input terminal of amplifier and second trsanscondutance amplifier, the second end of the 24th transistor is as described first
The reversed-phase output of trsanscondutance amplifier and second trsanscondutance amplifier, described in the second end of the 25th transistor is used as
The in-phase output end of first trsanscondutance amplifier and second trsanscondutance amplifier, it is the second end of the tenth two-transistor, described
The second end of 9th resistance, the first end of the 15th transistor, the second end of the 19th transistor, the described 20th
The second end of transistor and the second end of the 21st transistor are grounded.
Preferably, first trsanscondutance amplifier and second trsanscondutance amplifier include the 14th resistance, and the 15th
Resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 26th transistor, the 27th transistor is until the 40th
One transistor, in which:
The first end of 14th resistance respectively with the second end of the 30th transistor, the 30th two-transistor second
The second end connection at end, the second end of the 33rd transistor and the 34th transistor, common end are connect with the power supply,
The control with the first end, the 26th transistor of the 26th transistor respectively of the second end of 14th resistance
The connection of the control terminal of end processed and the 27th transistor, the second end of the 26th transistor is respectively with the 28th
The first end of transistor and the control terminal of the 29th transistor connection, the control terminal of the 28th transistor respectively with institute
The first end of the 29th transistor and the second end connection of the 27th transistor are stated, the 29th transistor
Second end is connect with the first end of the 15th resistance, and the first end of the 27th transistor is respectively with the described 30th
The first end of transistor, the control terminal of the 31st transistor connection, the control terminal of the 30th transistor respectively with it is described
The second end of 31st transistor, the control terminal of the 30th two-transistor, the control terminal of the 33rd transistor
And the 34th transistor control terminal connection, the first end of the 30th two-transistor respectively with the 35th crystal
The first end of pipe, the control terminal of the 35th transistor, the control terminal and the 37th transistor of the 36th transistor
Control terminal connection, the second end of the 35th transistor connect with the first end of the 16th resistance, the third
The second end of 16 transistors is connect with the second end of the 37th transistor, common end and the 17th resistance
First end connection, the first end of the 33rd transistor respectively with the first end of the 18th resistance, the 40th crystal
The second end of pipe and the first end of the 38th transistor connection, the first end of the 40th transistor respectively with the third
The control terminal of 18 transistors and the connection of the first end of the 36th transistor, the first end of the 34th transistor
Respectively with the first of the second end of the 18th resistance, the second end of the 41st transistor and the 39th transistor
End connection, the first end of the 41st transistor control terminal and the described 30th with the 39th transistor respectively
The first end of seven transistors connects, and the control terminal of the 40th transistor is as first trsanscondutance amplifier and described second
The non-inverting input terminal of trsanscondutance amplifier, the control terminal of the 41st transistor is as first trsanscondutance amplifier and described
The inverting input terminal of second trsanscondutance amplifier, the second end of the 38th transistor as first trsanscondutance amplifier and
The second end of the reversed-phase output of second trsanscondutance amplifier, the 39th transistor is amplified as first mutual conductance
The in-phase output end of device and second trsanscondutance amplifier, the second end of the 28th transistor, the 15th resistance
Second end, the first end of the 31st transistor, the second end of the 16th resistance, the 17th resistance
Two ends are grounded.
Preferably, which further includes the 19th resistance, the 20th resistance, the 21st resistance, and
22 resistance, in which:
The first end of 19th resistance is connect with the in-phase output end of first amplifier, the 19th resistance
Second end connect respectively with the first end of the non-inverting input terminal of the third amplifier and the 21st resistance, described
The first end of 20 resistance is connect with the reversed-phase output of first amplifier, the second end of the 20th resistance respectively with
The inverting input terminal of the third amplifier and the connection of the first end of the 22nd resistance, the of the 22nd resistance
Two ends are connect with the output end of the third amplifier.
Preferably, the first transistor, the second transistor is until the 25th transistor is triode.
Preferably, the 26th transistor, the 27th transistor is until the 41st transistor is equal
For triode.
The present invention provides a kind of hall signal amplifying circuit, including the Hall sensor module connected to power supply, first
Amplifier, the second amplifier identical with the first amplifier architecture, third amplifier, compensating module, in which: Hall sensor mould
The non-inverting input terminal connection of the first output end and the first amplifier of block, the second output terminal of Hall sensor module and first are put
The inverting input terminal connection of big device, the in-phase output end of the first amplifier respectively with the in-phase output end and third of the second amplifier
The non-inverting input terminal of amplifier connects, the reversed-phase output of the first amplifier respectively with the reversed-phase output of the second amplifier and the
The inverting input terminal of three amplifiers connects, and the first output end of compensating module is connect with the non-inverting input terminal of the second amplifier, mends
The second output terminal for repaying module is connect with the inverting input terminal of the second amplifier；Compensating module is related to thermal voltage for determination
Reference current obtain and input offset voltage is equal in magnitude, polarity and according to reference current and the input offset voltage of acquisition
Equivalent input noise voltage opposite and relevant to thermal voltage, and equivalent input noise voltage is exported to the second amplifier.It can
See, in practical applications, using the solution of the present invention, equivalent inpnt imbalance electricity relevant to thermal voltage is generated by compensating module
Pressure has good temperature compensation function while eliminating offset voltage, and quiescent output voltage is made to work in total temperature
There is very high precision in range.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of hall signal amplifying circuit in the prior art；
Fig. 2 is a kind of structural schematic diagram of hall signal amplifying circuit provided by the present invention；
Fig. 3 is a kind of structural schematic diagram of compensating module provided by the present invention；
Fig. 4 is the structural schematic diagram of another hall signal amplifying circuit provided by the present invention；
Fig. 5 is a kind of structural schematic diagram of trsanscondutance amplifier provided by the present invention；
Fig. 6 is the structural schematic diagram of another trsanscondutance amplifier provided by the present invention；
Fig. 7 is a kind of structural schematic diagram of the embodiment of Hall amplified signal circuit provided by the present invention.
Specific embodiment
Core of the invention is to provide a kind of hall signal amplifying circuit, is generated by compensating module relevant to thermal voltage
Equivalent input noise voltage has good temperature compensation function while eliminating offset voltage, keeps Static output electric
Being pressed in total temperature working range has very high precision.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to figure 2., Fig. 2 is a kind of structural schematic diagram of hall signal amplifying circuit provided by the present invention, including with
The Hall sensor module 1 of power supply VCC connection, the first amplifier A1, with the first amplifier A1Identical second amplifier of structure
A2, third amplifier A3, compensating module 2, in which:
First output end of Hall sensor module 1 and the first amplifier A1Non-inverting input terminal connection, Hall sensor
The second output terminal of module 1 and the first amplifier A1Inverting input terminal connection, the first amplifier A1In-phase output end respectively with
Second amplifier A2In-phase output end and third amplifier A3Non-inverting input terminal connection, the first amplifier A1Anti-phase output
End respectively with the second amplifier A2Reversed-phase output and third amplifier A3Inverting input terminal connection, the first of compensating module 2
Output end and the second amplifier A2Non-inverting input terminal connection, the second output terminal of compensating module 2 and the second amplifier A2Reverse phase
Input terminal connection；
Compensating module 2 loses for determining reference current relevant to thermal voltage, and according to the input of reference current and acquisition
Voltage is adjusted, is obtained and input offset voltage is equal in magnitude, polarity is opposite and equivalent input noise voltage relevant with thermal voltage, and
Equivalent input noise voltage is exported to the second amplifier A2。
Specifically, power supply VCC is that Hall sensor power supply makes Hall sensor module 1 export hall signal, hall signal
Through the first amplifier A1After amplification, output to third amplifier A3Carry out second level amplification, the first amplifier A1With the second amplifier
A2Structure it is completely the same, the first amplifier A1Output signal divide two-way to export, be all the way from its in-phase output end export, separately
It is to be exported from its reversed-phase output all the way, the second amplifier A2Output signal, similarly.In said structure, from the first amplification
Device A1In-phase output end output output signal with from the second amplifier A2In-phase output end output output signal asked
With it is rear, then access third amplifier A3Non-inverting input terminal, correspondingly, from the first amplifier A1Reversed-phase output output it is defeated
Out signal with from the second amplifier A2Reversed-phase output output output signal summed after, then access third amplifier A3
Inverting input terminal, pass through detection third amplifier A3Output end quiescent output voltage VOUTIt can obtain output offset voltage
VOSout, quiescent output voltage and the calculation relational expression for exporting offset voltage are VOSout=Vout-Vcc/ 2, wherein VccFor power supply
Voltage, the input offset voltage VOS of amplifierinCalculation relational expression be VOSin=VOSout/ A, A are Hall sensor module 1
Output port is to third amplifier A3Output end gain, due to the first amplifier A1With the second amplifier A2Structure it is complete
It is identical, therefore, the output port of compensating module 2 to third amplifier A3The gain of output end be also A, that is to say, that if
It is generated and input offset voltage VOS in compensating module 2inEqual in magnitude, opposite polarity equivalent input noise voltage can be completely
Eliminate the influence of offset voltage, it is contemplated that the temperature coefficient of offset voltage is related to thermal voltage, and therefore, the present invention is logical
Overcompensation module 2 predefines reference current relevant to thermal voltage, is generated by reference current relevant to thermal voltage equivalent
Input offset voltage, while input offset voltage VOS obtained by calculationinSize and polarity, adjust the equivalent inpnt mistake
The size and polarity for adjusting voltage, make equivalent input noise voltage and input offset voltage VOSinIt is equal in magnitude, polarity is opposite.
To sum up, the present invention generates equivalent input noise voltage relevant to thermal voltage by compensating module 2, is eliminating amplifier
While offset voltage, there is good temperature compensation function, quiescent output voltage can be adjusted to midpoint potential, make Static output
Voltage VOUTAll there is very high precision in total temperature working range.
The present invention provides a kind of hall signal amplifying circuit, including the Hall sensor module connected to power supply, first
Amplifier, the second amplifier identical with the first amplifier architecture, third amplifier, compensating module, in which: Hall sensor mould
The non-inverting input terminal connection of the first output end and the first amplifier of block, the second output terminal of Hall sensor module and first are put
The inverting input terminal connection of big device, the in-phase output end of the first amplifier respectively with the in-phase output end and third of the second amplifier
The non-inverting input terminal of amplifier connects, the reversed-phase output of the first amplifier respectively with the reversed-phase output of the second amplifier and the
The inverting input terminal of three amplifiers connects, and the first output end of compensating module is connect with the non-inverting input terminal of the second amplifier, mends
The second output terminal for repaying module is connect with the inverting input terminal of the second amplifier；Compensating module is related to thermal voltage for determination
Reference current obtain and input offset voltage is equal in magnitude, polarity and according to reference current and the input offset voltage of acquisition
Equivalent input noise voltage opposite and relevant to thermal voltage, and equivalent input noise voltage is exported to the second amplifier.It can
See, in practical applications, using the solution of the present invention, equivalent inpnt imbalance electricity relevant to thermal voltage is generated by compensating module
Pressure has good temperature compensation function while eliminating offset voltage, and quiescent output voltage is made to work in total temperature
There is very high precision in range.
On the basis of the above embodiments:
Embodiment as one preferred, compensating module 2 include first resistor R1, second resistance R2, 3rd resistor R3, the
Four resistance R4, the 5th resistance R5, the first transistor M1, second transistor M2, third transistor M3, the 4th transistor M4, the 5th is brilliant
Body pipe M5, the 6th transistor M6, the 7th transistor M7, the 8th transistor M8, the 9th transistor M9, the first fusible link F1, second is molten
Fracture of wire F2, in which:
First resistor R1First end respectively with 3rd resistor R3First end and the 4th resistance R4First end connection,
Common end is connect with power supply VCC, first resistor R1Second end respectively with the first transistor M1First end, the first transistor M1
Control terminal and second transistor M2Control terminal connection, the first transistor M1Second end respectively with third transistor M3?
One end and the 4th transistor M4Control terminal connection, third transistor M3Control terminal respectively with the 4th transistor M4First end
And second transistor M2Second end connection, the 4th transistor M4Second end and second resistance R2First end connection, second is brilliant
Body pipe M2First end respectively with the 5th transistor M5First end, the 7th transistor M7Control terminal, the 8th transistor M8Control
End processed, the 9th transistor M9Control terminal connection, the 5th transistor M5Second end and 3rd resistor R3Second end connection, the
Five transistor M5Control terminal respectively with the 7th transistor M7Second end and the 6th transistor M6Control terminal connection, the 6th is brilliant
Body pipe M6Second end and the 4th resistance R4Second end connection, the 6th transistor M6First end respectively with the 8th transistor M8
Second end and the 9th transistor M9Second end connection, the 8th transistor M8First end respectively with the 5th resistance R5First
End and the first fusible link F1First end connection, second output terminal of the common end as compensating module 2, the 9th transistor M9's
First end respectively with the 5th resistance R5Second end and second resistance R2The first end connection of silk, common end is as compensating module 2
The first output end, third transistor M3Second end, the 7th transistor M7First end and second resistance R2Second end connect
Ground；
Compensating module 2 further include respectively with the 5th resistance R5, the first fusible link F1And the second fusible link F2It connects, for adjusting
Whole 5th resistance R5Resistance value to control the 5th resistance R5On voltage with input offset voltage is equal in magnitude, is also used to control the
One fusible link F1And the second fusible link F2Fusing to control equivalent input noise voltage and the opposite polarity control of input offset voltage
Unit 21 processed；
Second resistance R2With 3rd resistor R3, the 4th resistance R4, the 5th resistance R5Type it is identical.
Specifically, shown in specific structure reference Fig. 3 of compensating module 2, including first resistor R1, second resistance R2, third electricity
Hinder R3, the 4th resistance R4, the 5th resistance R5, the first transistor M1, second transistor M2, third transistor M3, the 4th transistor M4,
5th transistor M5, the 6th transistor M6, the 7th transistor M7, the 8th transistor M8, the 9th transistor M9, the first fusible link F1,
Second fusible link F2With control unit 21, wherein the first transistor M1To the 9th transistor M9Represented with the structure of triode.
Specifically, by first resistor R1, second resistance R2, the first transistor M1, second transistor M2, third transistor M3,
4th transistor M4Auto bias circuit is constituted, reference current I is generatedREF, reference current IREFCalculation relational expression be IREF=VT×
ln(n)/R2, VTFor the thermal voltage of hall signal amplifying circuit, n is second transistor M2With third transistor M3Area product
With the first transistor M1With the 4th transistor M4Area product ratio, i.e., For the first transistor M1's
Area,For second transistor M2Area,For third transistor M3Area,For the 4th transistor M4Area,
And pass through the 5th transistor M5, the 6th transistor M6, 3rd resistor R3, the 4th resistance R4Composition current source generates electric current I1,
Assuming that the 5th transistor M5With the 6th transistor M6Area ratio be equal to 3rd resistor R3With the 4th resistance R4Ratio, electric current I1
Calculation relational expression be I1=IREF×R3/R4。
Specifically, control unit 21 controls the first fusible link F by way of trimming (trimming)1Or second fusible link
F2Fusing, to control the polarity of equivalent input noise voltage, since the polarity and size of input offset voltage can pass through meter
It obtains, known quantity can be regarded, therefore, control unit 21 can directly obtain pole required for equivalent input noise voltage
Property, specifically, the polarity of equivalent input noise voltage is negative if the polarity for the input offset voltage being calculated is positive, that
Control unit 21 controls the first fusible link F1It disconnects, then OUT+ < OUT-, wherein OUT+ is the first output of compensating module 2
The voltage at end, OUT- are the voltage of the second output terminal of compensating module 2, and the equivalent inpnt that compensating module 2 exports at this time is lacked of proper care electric
Pressure is negative, if the polarity for the input offset voltage being calculated is negative, the polarity of equivalent input noise voltage is positive, then controlling
Unit 21 processed controls the second fusible link F2It disconnects, then OUT+ > OUT-, the equivalent input noise voltage that compensating module 2 exports at this time
Polarity be positive.
After having adjusted the polarity of equivalent input noise voltage, according to the big ditty for the input offset voltage being calculated
The size of whole equivalent input noise voltage, according to the circuit structure of the present embodiment it is found that I1=IREF×R3/R4, I1=I2+I3, I2
=I3=1/2I1=1/2IREF×R3/R4, therefore, equivalent input noise voltage relational expression is | (OUT+)-(OUT-) |=1/2 ×
VT×ln(n)×(R5/R2)×(R3/R4), control unit 21 makes by adjusting the resistance value of R5 | (OUT+)-(OUT-) | size with
Input offset voltage is equal, while second resistance R2, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5It is all made of same type
Resistance, the influence of the temperature coefficient of resistance to the temperature coefficient of quiescent output voltage is offset with this, makes equivalent inpnt imbalance electricity
The temperature coefficient of pressure is only related to thermal voltage, so that control unit 21 adjusts the 5th resistance R by way of trimming5Resistance
Value adjusts the size of equivalent input noise voltage, can be completely counterbalanced by the input offset voltage of amplifier.
Referring to figure 4., Fig. 4 is another hall signal amplifying circuit provided by the present invention, hall signal amplification electricity
Road is on the basis of the above embodiments:
Embodiment as one preferred, the first amplifier A1For the first trsanscondutance amplifier GM1, the second amplifier A2It is
Two trsanscondutance amplifier GM2；
The then hall signal amplifying circuit further include:
First end and the first trsanscondutance amplifier GM1In-phase output end connection, second end and AC deposition AC Ground connection
The 6th resistance R6；
First end and the second trsanscondutance amplifier GM2Reversed-phase output connection, second end and AC deposition AC Ground connection
The 7th resistance R7。
Specifically, trsanscondutance amplifier is a kind of amplifier that input difference voltage is converted to output electric current, therefore first
Trsanscondutance amplifier GM1In-phase output end output be current signal, be connected to the 6th resistance R in its in-phase output end6Purpose be
In order to by the first trsanscondutance amplifier GM1In-phase output end output current signal and the second trsanscondutance amplifier GM2Same phase output
It holds the sum of the current signal of output to be converted to differential voltage signal and accesses third amplifier A again3Non-inverting input terminal, the second mutual conductance
Amplifier GM2Similarly, by the second trsanscondutance amplifier GM2Reversed-phase output connect the 7th resistance R7, so as to by the first mutual conductance
The current signal and the second trsanscondutance amplifier GM of the reversed-phase output output of amplifier GM12Reversed-phase output output electric current
The sum of signal is converted to differential voltage signal and accesses third amplifier A again3Reverse input end, the 6th resistance R6Second termination
AC deposition AC Ground, the 7th resistance R7Second termination AC deposition AC Ground.
Embodiment as one preferred, the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2It include the 8th electricity
Hinder R8, the 9th resistance R9Until thirteenth resistor R13, the tenth transistor M10, the 11st transistor M11Until the 25th transistor
M25, in which:
8th resistance R8First end respectively with the tenth resistance R10First end, eleventh resistor R11First end and the tenth
Two resistance R12First end connection, common end connect with power supply VCC, the 8th resistance R8Second end respectively with the tenth transistor
M10First end, the tenth transistor M10Control terminal and the 11st transistor M11Control terminal connection, the tenth transistor M10?
Two ends respectively with the tenth two-transistor M12First end and the 13rd transistor M13Control terminal connection, the tenth two-transistor M12
Control terminal respectively with the 13rd transistor M13First end and the 11st transistor M11Second end connection, the 13rd crystal
Pipe M13Second end and the 9th resistance R9First end connection, the 11st transistor M11First end respectively with the 15th transistor
M15Control terminal and the 14th transistor M14First end connection, the 14th transistor M14Second end and the tenth resistance R10's
Second end connection, the 14th transistor M14Control terminal respectively with the 15th transistor M15Second end and the 16th transistor
M16Control terminal, the 17th transistor M17Control terminal and the 18th transistor M18Control terminal connection, the 16th transistor M16
Second end and eleventh resistor R11Second end connection, the 16th transistor M16First end respectively with the 19th transistor
M19First end, the 19th transistor M19Control terminal, the 20th transistor M20Control terminal and the 21st transistor M21's
Control terminal connection, the 17th transistor M17Second end respectively with the 18th transistor M18Second end and twelfth resistor R12
Second end connection, the 17th transistor M17First end respectively with the 20th two-transistor M22First end and the 24th
Transistor M24Control terminal connection, the 18th transistor M18First end respectively with the 23rd transistor M23First end and
25th transistor M25Control terminal connection, the 20th two-transistor M22Second end respectively with thirteenth resistor R13?
One end, the 24th transistor M24First end and the 20th transistor M20First end connection, the 20th two-transistor M22's
Control terminal is as the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2Non-inverting input terminal, the 23rd transistor M23's
Second end respectively with the 25th transistor M25First end, thirteenth resistor R13Second end and the 21st transistor M21
First end connection, the 23rd transistor M23Control terminal as the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2
Inverting input terminal, the 24th transistor M24Second end as the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2
Reversed-phase output, the 25th transistor M25Second end as the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2
In-phase output end, the tenth two-transistor M12Second end, the 9th resistance R9Second end, the 15th transistor M15First
End, the 19th transistor M19Second end, the 20th transistor M20Second end and the 21st transistor M21Second end it is equal
Ground connection.
Specifically, the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2Structure be it is identical, specific structure ginseng
According to shown in Fig. 5, wherein the tenth transistor M10To the 25th transistor M25Structure represented with the structure of triode, with the
One trsanscondutance amplifier GM1For, the 8th resistance R8, the 9th resistance R9, the tenth transistor M10, the 11st transistor M11, the 12nd
Transistor M12, the 13rd transistor M13The auto bias circuit of composition generates reference current IREF, by mirror current source to difference
Amplifier is biased, the 20th two-transistor M22Control terminal and the 23rd transistor M23Control terminal as first across
Lead amplifier GM1Differential input end, the 24th transistor M24With the 25th transistor M25For emitter follower, after reducing
Influence of the grade input impedance to prime signal, wherein the equivalent transconductance relational expression of trsanscondutance amplifier is
Embodiment as one preferred, the first trsanscondutance amplifier GM1 and the second trsanscondutance amplifier GM2 include the 14th
Resistance R14, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance R18, the 26th transistor
M26, the 27th transistor M27Until the 41st transistor M41, in which:
14th resistance R14First end respectively with the 30th transistor M30Second end, the 30th two-transistor M32's
Second end, the 33rd transistor M33Second end and the 34th transistor M34Second end connection, common end and power supply
VCC connection, the 14th resistance R14Second end respectively with the 26th transistor M26First end, the 26th transistor M26
Control terminal and the 27th transistor M27Control terminal connection, the 26th transistor M26Second end respectively with the 20th
Eight transistor M28First end and the 29th transistor M29Control terminal connection, the 28th transistor M28Control terminal point
Not with the 29th transistor M29First end and the 27th transistor M27Second end connection, the 29th transistor M29
Second end and the 15th resistance R15First end connection, the 27th transistor M27First end respectively with the 30th crystal
Pipe M30First end, the 31st transistor M31Control terminal connection, the 30th transistor M30Control terminal respectively with the 30th
One transistor M31Second end, the 30th two-transistor M32Control terminal, the 33rd transistor M33Control terminal and the 30th
Four transistor M34Control terminal connection, the 30th two-transistor M32First end respectively with the 35th transistor M35First
End, the 35th transistor M35Control terminal, the 36th transistor M36Control terminal and the 37th transistor M37Control
End connection, the 35th transistor M35Second end and the 16th resistance R16First end connection, the 36th transistor M36's
Second end and the 37th transistor M37Second end connection, common end and the 17th resistance R17First end connection, third
13 transistor M33First end respectively with the 18th resistance R18First end, the 40th transistor M40Second end and third
18 transistor M38First end connection, the 40th transistor M40First end respectively with the 38th transistor M38Control
End and the 36th transistor M36First end connection, the 34th transistor M34First end respectively with the 18th resistance R18
Second end, the 41st transistor M41Second end and the 39th transistor M39First end connection, the 41st crystal
Pipe M41First end respectively with the 39th transistor M39Control terminal and the 37th transistor M37First end connection, the
40 transistor M40Control terminal as the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2Non-inverting input terminal, the 4th
11 transistor M41Control terminal as the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2Inverting input terminal, third
18 transistor M38Second end as the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2Reversed-phase output, third
19 transistor M39Second end as the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2In-phase output end, second
18 transistor M28Second end, the 15th resistance R15Second end, the 31st transistor M31First end, the 16th electricity
Hinder R16Second end, the 17th resistance R17Second end be grounded.
Specifically, the first trsanscondutance amplifier GM1With the second trsanscondutance amplifier GM2Can also using structure as shown in FIG. 6 come
Realize its function.
Embodiment as one preferred, the hall signal amplifying circuit further include the 19th resistance R19, the 20th resistance
R20, the 21st resistance R21, the 22nd resistance R22, in which:
19th resistance R19First end and the first amplifier A1In-phase output end connection, the 19th resistance R19Second
End respectively with third amplifier A3Non-inverting input terminal and the 21st resistance R21First end connection, the 20th resistance R20?
One end and the first amplifier A1Reversed-phase output connection, the 20th resistance R20Second end respectively with third amplifier A3It is anti-
Phase input terminal and the 22nd resistance R22First end connection, the 22nd resistance R22Second end and third amplifier A3It is defeated
Outlet connection.
Specifically, referring to shown in Fig. 7, the 19th resistance R19, the 20th resistance R20, the 21st resistance R21, the 22nd
Resistance R22With third amplifier A3Constitute difference ratio operational amplifier configuration, the 19th resistance R19With the 20th resistance R20Phase
Together, the 21st resistance R21With the 22nd resistance R22It is identical, if third amplifier A at this time3Yield value be A1, corresponding A1
=-R21/R19。
Embodiment as one preferred, the first transistor M1, second transistor M2Until the 25th transistor M25?
For triode.
Embodiment as one preferred, the 26th transistor M26, the 27th transistor M27Until the 41st is brilliant
Body pipe M41It is triode.
Specifically, cost is relatively low for triode, hall signal amplifying circuit provided by the present invention is constituted using triode
While can guaranteeing its advantage, save the cost.
Certainly, above-mentioned each transistor can also select CMOS tube according to actual requirement of engineering in addition to that can select triode
Or other transistors, as long as above-mentioned function may be implemented.
Wherein, in such as Fig. 3, Fig. 5, structural schematic diagram shown in fig. 6, the first transistor M1, second transistor M2, third
Transistor M3, the 4th transistor M4, the tenth transistor M10, the 11st transistor M11, the tenth two-transistor M12, the 13rd transistor
M13, the 19th transistor M19, the 20th transistor M20, the 21st transistor M21, the 20th two-transistor M22, the 23rd
Transistor M23, the 26th transistor M26, the 27th transistor M27, the 28th transistor M28, the 29th transistor
M29, the 35th transistor M35, the 36th transistor M36, the 37th transistor M37, the 38th transistor M38, third
19 transistor M39It is NPN type triode, remaining all transistor is PNP transistor.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of hall signal amplifying circuit, which is characterized in that including the Hall sensor module connected to power supply, the first amplification
Device, the second amplifier identical with first amplifier architecture, third amplifier, compensating module, in which:
First output end of the Hall sensor module is connected with the non-inverting input terminal of first amplifier, and the Hall passes
The second output terminal of sensor module is connected with the inverting input terminal of first amplifier, the same phase output of first amplifier
End is connect with the non-inverting input terminal of the in-phase output end of second amplifier and the third amplifier respectively, and described first puts
The reversed-phase output of the big device inverting input terminal with the reversed-phase output of second amplifier and the third amplifier respectively
Connection, the first output end of the compensating module are connect with the non-inverting input terminal of second amplifier, the compensating module
Second output terminal is connect with the inverting input terminal of second amplifier；
The compensating module, for determining relevant to thermal voltage reference current, and according to the defeated of the reference current and acquisition
Enter offset voltage, obtains and the input offset voltage is equal in magnitude, polarity is opposite and relevant with the thermal voltage equivalent defeated
Enter offset voltage, and the equivalent input noise voltage is exported to second amplifier.
2. hall signal amplifying circuit according to claim 1, which is characterized in that the compensating module includes the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first transistor, second transistor, third transistor, the 4th
Transistor, the 5th transistor, the 6th transistor, the 7th transistor, the 8th transistor, the 9th transistor, the first fusible link, second
Fusible link, in which:
The first end of the first resistor is connected with the first end of the first end of the 3rd resistor and the 4th resistance respectively,
Its common end is connect with the power supply, the second end of the first resistor respectively with the first end of the first transistor, described
The control terminal of the first transistor and the connection of the control terminal of the second transistor, the second end of the first transistor is respectively and institute
State third transistor first end and the 4th transistor control terminal connection, the control terminal of the third transistor respectively and
The first end of 4th transistor and the second end connection of the second transistor, the second end of the 4th transistor and institute
State second resistance first end connection, the first end of the second transistor respectively with the first end of the 5th transistor, institute
State the control terminal of the 7th transistor, the control terminal of the 8th transistor, the connection of the control terminal of the 9th transistor, described the
The second end of five transistors is connect with the second end of the 3rd resistor, and the control terminal of the 5th transistor is respectively with described
The second end of seven transistors and the connection of the control terminal of the 6th transistor, the second end and the described 4th of the 6th transistor
The second end of resistance connects, the first end of the 6th transistor second end and the described 9th with the 8th transistor respectively
The second end of transistor connects, the first end of the 8th transistor first end and described first with the 5th resistance respectively
The first end of fusible link connects, second output terminal of the common end as the compensating module, and the first of the 9th transistor
End is connect with the first end of the second end of the 5th resistance and the second resistance silk respectively, and common end is as the compensation
First output end of module, the first end and the second resistance of the second end of the third transistor, the 7th transistor
Second end be grounded；
The compensating module further include connect respectively with the 5th resistance, first fusible link and second fusible link,
For adjusting the resistance value of the 5th resistance to control the 5th ohmically voltage and the input offset voltage size phase
Deng, be also used to control the fusing of first fusible link and second fusible link with control the equivalent input noise voltage with
The opposite polarity control unit of input offset voltage；
The second resistance is identical as the 3rd resistor, the 4th resistance, the type of the 5th resistance.
3. hall signal amplifying circuit according to claim 1, which is characterized in that first amplifier is the first mutual conductance
Amplifier, second amplifier are the second trsanscondutance amplifier；
The then hall signal amplifying circuit further include:
The 6th resistance that first end is connect with the in-phase output end of first trsanscondutance amplifier, second end and AC deposition connect；
The 7th resistance that first end is connect with the reversed-phase output of second trsanscondutance amplifier, second end and AC deposition connect.
4. hall signal amplifying circuit according to claim 3, which is characterized in that first trsanscondutance amplifier and described
Second trsanscondutance amplifier includes the 8th resistance, and the 9th resistance is until thirteenth resistor, the tenth transistor, the 11st transistor are straight
To the 25th transistor, in which:
The first end of 8th resistance respectively with the first end, the first end of eleventh resistor and twelfth resistor of the tenth resistance
First end connection, common end connect with the power supply, the second end of the 8th resistance respectively with the tenth transistor
First end, the connection of the control terminal of the control terminal of the tenth transistor and the 11st transistor, the tenth transistor
Second end connect respectively with the control terminal of the first end of the tenth two-transistor and the 13rd transistor, the tenth two-transistor
Control terminal connect respectively with the second end of the first end of the 13rd transistor and the 11st transistor, the described tenth
The second end of three transistors is connect with the first end of the 9th resistance, and the first end of the 11st transistor is respectively with the tenth
The control terminal of five transistors and the connection of the first end of the 14th transistor, the second end and the described tenth of the 14th transistor
The second end of resistance connects, the control terminal of the 14th transistor second end and the tenth with the 15th transistor respectively
The control terminal of the control terminal of six transistors, the control terminal of the 17th transistor and the 18th transistor connects, and the described 16th is brilliant
The second end of body pipe is connect with the second end of the eleventh resistor, and the first end of the 16th transistor is respectively with the 19th
The first end of transistor, the control terminal of the 19th transistor, the control terminal and the 21st transistor of the 20th transistor
Control terminal connection, the second end of the 17th transistor second end and the described tenth with the 18th transistor respectively
The second ends of two resistance connects, the first end of the 17th transistor first end and second with the 20th two-transistor respectively
The control terminals of 14 transistors connects, the first end of the 18th transistor respectively with the first end of the 23rd transistor and
The control terminal of 25th transistor connects, the second end of the 20th two-transistor respectively with the thirteenth resistor
First end, the connection of the first end of the first end of the 24th transistor and the 20th transistor, the described 20th
Non-inverting input terminal of the control terminal of two-transistor as first trsanscondutance amplifier and second trsanscondutance amplifier, described
The second end of 23 transistors respectively with the first end of the 25th transistor, the second end of the thirteenth resistor and
The first end of 21st transistor connects, and the control terminal of the 23rd transistor is amplified as first mutual conductance
The inverting input terminal of device and second trsanscondutance amplifier, the second end of the 24th transistor is as first mutual conductance
The reversed-phase output of amplifier and second trsanscondutance amplifier, the second end of the 25th transistor is as described first
The in-phase output end of trsanscondutance amplifier and second trsanscondutance amplifier, the second end of the tenth two-transistor, the described 9th
The second end of resistance, the first end of the 15th transistor, the second end of the 19th transistor, the 20th crystal
The second end of pipe and the second end of the 21st transistor are grounded.
5. hall signal amplifying circuit according to claim 3, which is characterized in that first trsanscondutance amplifier and described
Second trsanscondutance amplifier includes the 14th resistance, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, and
26 transistors, the 27th transistor is until the 41st transistor, in which:
The first end of 14th resistance respectively with the second end of the 30th transistor, the second end of the 30th two-transistor,
The second end of 33rd transistor and the second end connection of the 34th transistor, common end are connect with the power supply, institute
State the second end control with the first end, the 26th transistor of the 26th transistor respectively of the 14th resistance
The connection of the control terminal of end and the 27th transistor, the second end of the 26th transistor are brilliant with the 28th respectively
The first end of body pipe and the control terminal of the 29th transistor connection, the control terminal of the 28th transistor respectively with it is described
The first end of 29th transistor and the connection of the second end of the 27th transistor, the of the 29th transistor
Two ends are connect with the first end of the 15th resistance, and the first end of the 27th transistor is brilliant with the described 30th respectively
The first end of body pipe, the connection of the control terminal of the 31st transistor, the control terminal of the 30th transistor is respectively with described the
The second end of 31 transistors, the control terminal of the 30th two-transistor, the control terminal of the 33rd transistor and
The control terminal of 34th transistor connects, the first end of the 30th two-transistor respectively with the 35th transistor
First end, the control terminal of the 35th transistor, the control terminal of the 36th transistor and the 37th transistor
Control terminal connection, the second end of the 35th transistor are connect with the first end of the 16th resistance, and the described 30th
The second end of six transistors is connect with the second end of the 37th transistor, and the of common end and the 17th resistance
One end connection, the first end of the 33rd transistor respectively with the first end of the 18th resistance, the 40th transistor
Second end and the 38th transistor first end connection, the first end of the 40th transistor is respectively with the described 30th
The control terminal of eight transistors and the connection of the first end of the 36th transistor, the first end point of the 34th transistor
Not with the second end, the second end of the 41st transistor and the first end of the 39th transistor of the 18th resistance
Connection, the first end of the 41st transistor control terminal and the described 37th with the 39th transistor respectively
The first end of transistor connects, the control terminal of the 40th transistor as first trsanscondutance amplifier and described second across
The non-inverting input terminal of amplifier is led, the control terminal of the 41st transistor is as first trsanscondutance amplifier and described
The inverting input terminal of two trsanscondutance amplifiers, the second end of the 38th transistor is as first trsanscondutance amplifier and institute
The reversed-phase output of the second trsanscondutance amplifier is stated, the second end of the 39th transistor is as first trsanscondutance amplifier
With the in-phase output end of second trsanscondutance amplifier, the second end of the 28th transistor, the 15th resistance
Second end, the first end of the 31st transistor, the second end of the 16th resistance, the 17th resistance second
End is grounded.
6. hall signal amplifying circuit according to claim 1, which is characterized in that the hall signal amplifying circuit further includes
19th resistance, the 20th resistance, the 21st resistance, the 22nd resistance, in which:
The first end of 19th resistance is connect with the in-phase output end of first amplifier, and the of the 19th resistance
Two ends are connect with the first end of the non-inverting input terminal of the third amplifier and the 21st resistance respectively, and the described 20th
The first end of resistance is connect with the reversed-phase output of first amplifier, the second end of the 20th resistance respectively with it is described
The inverting input terminal of third amplifier and the connection of the first end of the 22nd resistance, the second end of the 22nd resistance
It is connect with the output end of the third amplifier.
7. hall signal amplifying circuit according to claim 4, which is characterized in that the first transistor, described second
Transistor is until the 25th transistor is triode.
8. hall signal amplifying circuit according to claim 5, which is characterized in that the 26th transistor, it is described
27th transistor is until the 41st transistor is triode.
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| CN111026220A (en) * | 2019-12-12 | 2020-04-17 | 南京邮电大学 | Temperature stability control system of CMOS Hall sensor |
| CN111474456A (en) * | 2020-04-14 | 2020-07-31 | 新磊半导体科技（苏州）有限公司 | Hall effect voltage determining method and Hall test system |
| CN113114143A (en) * | 2021-05-10 | 2021-07-13 | 上海传泰电子科技有限公司 | Fully differential summation amplifying circuit |
| CN114285385A (en) * | 2022-02-21 | 2022-04-05 | 成都芯翼科技有限公司 | Offset circuit of operational amplifier input current |
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| CN109830215A (en) * | 2019-02-20 | 2019-05-31 | 京东方科技集团股份有限公司 | A kind of gamma-correction circuit, bearing calibration, source electrode drive circuit and display panel |
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| CN113114143A (en) * | 2021-05-10 | 2021-07-13 | 上海传泰电子科技有限公司 | Fully differential summation amplifying circuit |
| CN113114143B (en) * | 2021-05-10 | 2024-02-13 | 上海传泰电子科技有限公司 | Full-differential summation amplifying circuit |
| CN114285385A (en) * | 2022-02-21 | 2022-04-05 | 成都芯翼科技有限公司 | Offset circuit of operational amplifier input current |
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