CN108900169A - A kind of Hall amplifier - Google Patents
A kind of Hall amplifier Download PDFInfo
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- CN108900169A CN108900169A CN201811087338.XA CN201811087338A CN108900169A CN 108900169 A CN108900169 A CN 108900169A CN 201811087338 A CN201811087338 A CN 201811087338A CN 108900169 A CN108900169 A CN 108900169A
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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
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Abstract
The invention discloses a kind of Hall amplifiers, including the Hall Plate connected to power supply, first amplifier, second amplifier, third amplifier, feedback module, the output signal that the present invention generates the Hall voltage signal that Hall Plate exports after the first amplifier and the amplification of third amplifier, the second amplifier is fed back to through feedback module, it is equal in magnitude with the output signal of the second amplifier of guarantee and the output signal of the first amplifier, polarity is opposite, and the output signal that the second amplifier generates and the output signal that the first amplifier generates are summed, two-way output signal after summation exports after the amplification of third amplifier again, to realize the accurate amplification to Hall voltage signal, it is easy to operate.
Description
Technical Field
The invention relates to the field of amplifiers, in particular to a Hall amplifier.
Background
In the amplification environment of the hall voltage signal, because the hall voltage signal is very weak and accompanied by a lot of noises, it is particularly critical how to effectively detect and amplify the hall voltage signal, which has a high requirement on the structure of the amplifier.
At present, the common hall amplifier adopts the instrumentation amplifier structure shown in fig. 1, which includes a hall plate 01 and an operational amplifier OPA1Operational amplifier OPA2Operational amplifier OPA3The first resistance, the second resistance up to the seventh resistance, the first resistance is marked as R0The second resistor and the third resistor are the same and are both marked as R01The fourth resistor and the fifth resistor are the same and are both marked as R02The sixth resistor and the seventh resistor are the same and are both denoted as R03The Hall voltage signal (i.e. the input voltage) is denoted as VinThe output voltage signal (i.e. output voltage) is denoted as VoutUnder the above structure, the relation between the output voltage and the input voltage isIn order to adjust the amplification of the hall amplifier (i.e. to adjust the voltage sensitivity), the resistor needs to be adjusted if the resistor R is adjusted0Or adjusting two resistors R synchronously02The linear adjustment of the amplification precision cannot be realized, the mass production of the Hall amplifier is influenced, and if the two resistors R are synchronously adjusted01Or two resistors R03The two resistors need to be changed simultaneously, the operation is complex, and the output performance of the hall amplifier is affected by the conditions that the magnitude of the input voltage signal of the non-inverting input end and the magnitude of the input voltage signal of the inverting input end of the third amplifier are different in the adjusting process.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a Hall amplifier, which is characterized in that output signals generated after Hall voltage signals output by a Hall plate are amplified by a first amplifier and a third amplifier are fed back to a second amplifier by a feedback module so as to ensure that the output signals of the second amplifier are equal in size and opposite in polarity to the output signals of the first amplifier, the output signals generated by the second amplifier and the output signals generated by the first amplifier are summed, and the two paths of summed output signals are amplified by the third amplifier and then output, so that the Hall voltage signals are accurately amplified, and the operation is simple and convenient.
In order to solve the above technical problem, the present invention provides a hall amplifier, including a hall plate connected to a power supply, a first amplifier, a second amplifier, a third amplifier, and a feedback module, wherein:
the first output end of the Hall plate is connected with the non-inverting input end of the first amplifier, the second output end of the Hall plate is connected with the inverting input end of the first amplifier, the non-inverting output end of the first amplifier is respectively connected with the non-inverting output end of the second amplifier and the non-inverting input end of the third amplifier, the inverting output end of the first amplifier is respectively connected with the inverting output end of the second amplifier and the inverting input end of the third amplifier, so as to sum the output signal of the non-inverting output terminal of the first amplifier and the output signal of the non-inverting output terminal of the second amplifier and output the sum to the non-inverting input terminal of the third amplifier, meanwhile, the output signal of the inverting output end of the first amplifier and the output signal of the inverting output end of the second amplifier are summed and then output to the inverting input end of the third amplifier;
the output end of the third amplifier is connected with the input end of the feedback module, the first output end of the feedback module is connected with the inverting input end of the second amplifier, the second output end of the feedback module is connected with the non-inverting input end of the second amplifier, and the feedback module is used for adjusting the output signal of the second amplifier according to the summation result of the output signals, so that the input signal of the non-inverting input end of the third amplifier is equal in magnitude and opposite in polarity to the input signal of the inverting input end of the third amplifier.
Preferably, the first amplifier is a first transconductance amplifier, and the second amplifier is a second transconductance amplifier;
the hall amplifier further comprises a first resistor and a second resistor, wherein:
the first end of the first resistor is connected with the inverted output end of the first transconductance amplifier, the first end of the second resistor is connected with the non-inverted output end of the second transconductance amplifier, and the second end of the first resistor and the second end of the second resistor are both connected with the ground or a direct-current power supply.
Preferably, the feedback module includes a third resistor, a fourth resistor, and a management unit respectively connected to the third resistor and the fourth resistor, configured to obtain a terminal voltage of the third resistor and a terminal voltage of the fourth resistor, and further configured to adjust a resistance value of the third resistor and a resistance value of the fourth resistor, where:
the first end of the third resistor is used as the input end of the feedback module, the second end of the third resistor is respectively connected with the first end of the fourth resistor and the inverting input end of the second amplifier, and the second end of the fourth resistor is connected with the non-inverting input end of the second amplifier.
Preferably, the first transconductance amplifier includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth resistor, and the second transconductance amplifier includes a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, and a sixth resistor, wherein:
the control end of the first transistor is used as the non-inverting input end of the first transconductance amplifier, the control end of the second transistor is used as the inverting input end of the first transconductance amplifier, a second end of the first transistor is respectively connected with a first end of the fifth resistor and a first end of the third transistor, a second terminal of the second transistor is connected to a second terminal of the fifth resistor and a first terminal of the fourth transistor, the first end of the first transistor is respectively connected with the power module and the control end of the third transistor, a second end of the third transistor is used as an inverted output end of the first transconductance amplifier, a first end of the second transistor is respectively connected with the power module and a control end of the fourth transistor, and a second end of the fourth transistor is used as a non-inverted output end of the first transconductance amplifier;
a control terminal of the fifth transistor is used as a non-inverting input terminal of the second transconductance amplifier, a control terminal of the sixth transistor is used as an inverting input terminal of the second transconductance amplifier, a second end of the fifth transistor is connected to a first end of the sixth resistor and a first end of the seventh transistor respectively, a second terminal of the sixth transistor is connected to a second terminal of the sixth resistor and a first terminal of the eighth transistor, the first end of the fifth transistor is respectively connected with the power module and the control end of the seventh transistor, a second end of the seventh transistor is used as an inverted output end of the second transconductance amplifier, a first end of the sixth transistor is respectively connected with the power module and a control end of the eighth transistor, and a second end of the eighth transistor is used as a non-inverted output end of the second transconductance amplifier.
Preferably, the first transconductance amplifier includes a ninth transistor, a tenth transistor, an eleventh transistor, a twelfth transistor, and a seventh resistor, and the second transconductance amplifier includes a thirteenth transistor, a fourteenth transistor, a fifteenth transistor, a sixteenth transistor, and an eighth resistor, wherein:
a control terminal of the eleventh transistor serves as a non-inverting input terminal of the first transconductance amplifier, a control terminal of the twelfth transistor serves as an inverting input terminal of the first transconductance amplifier, a first end of the eleventh transistor is connected to the control end of the ninth transistor, a second end of the eleventh transistor is connected to the first end of the ninth transistor, the first end of the seventh resistor, and the power module, respectively, a second end of the ninth transistor is used as an inverting output end of the first transconductance amplifier, a second end of the twelfth transistor is respectively connected with a second end of the seventh resistor, the power supply module and a first end of the tenth transistor, a first end of the twelfth transistor is connected with a control end of the tenth transistor, and a second end of the tenth transistor is used as a non-inverting output end of the first transconductance amplifier;
a control terminal of the fifteenth transistor serves as a non-inverting input terminal of the second transconductance amplifier, a control terminal of the sixteenth transistor serves as an inverting input terminal of the second transconductance amplifier, a first end of the fifteenth transistor is connected to the control end of the thirteenth transistor, a second end of the fifteenth transistor is connected to the first end of the thirteenth transistor, the first end of the eighth resistor, and the power module, respectively, a second end of the thirteenth transistor is used as an inverting output end of the second transconductance amplifier, a second end of the sixteenth transistor is respectively connected with a second end of the eighth resistor, the power module and a first end of the fourteenth transistor, a first end of the sixteenth transistor is connected to a control end of the fourteenth transistor, and a second end of the fourteenth transistor is used as a non-inverting output end of the second transconductance amplifier.
Preferably, the first transistor, the second transistor, the fifth transistor, and the sixth transistor are all NPN transistors, wherein:
a base of the NPN type triode is used as a control terminal of the first transistor, the second transistor, the fifth transistor, and the sixth transistor, a collector of the NPN type triode is used as a first terminal of the first transistor, the second transistor, the fifth transistor, and the sixth transistor, and an emitter of the NPN type triode is used as a second terminal of the first transistor, the second transistor, the fifth transistor, and the sixth transistor;
the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor are all PNP-type triodes, wherein:
a base of the PNP transistor is used as a control terminal of the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor, a collector of the PNP transistor is used as a first terminal of the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor, and an emitter of the PNP transistor is used as a second terminal of the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor.
Preferably, the ninth transistor, the tenth transistor, the thirteenth transistor and the fourteenth transistor are all PNP transistors, wherein:
the base electrode of the PNP type triode is used as the control terminal of the ninth transistor, the tenth transistor, the thirteenth transistor and the fourteenth transistor, the collector electrode of the PNP type triode is used as the first terminal of the ninth transistor, the tenth transistor, the thirteenth transistor and the fourteenth transistor, and the emitter electrode of the PNP type triode is used as the second terminal of the ninth transistor, the tenth transistor, the thirteenth transistor and the fourteenth transistor;
the eleventh transistor, the twelfth transistor, the fifteenth transistor, and the sixteenth transistor are all NPN transistors, wherein:
a base of the NPN transistor serves as a control terminal of the eleventh, twelfth, fifteenth and sixteenth transistors, a collector of the NPN transistor serves as a first terminal of the eleventh, twelfth, fifteenth and sixteenth transistors, and an emitter of the NPN transistor serves as a second terminal of the eleventh, twelfth, fifteenth and sixteenth transistors.
Preferably, the third resistor comprises a plurality of resistors with different resistance values connected in series/in parallel.
The invention provides a Hall amplifier, which comprises a Hall plate connected with a power supply, a first amplifier, a second amplifier, a third amplifier and a feedback module, wherein: the first output end of the Hall plate is connected with the non-inverting input end of the first amplifier, the second output end of the Hall plate is connected with the inverting input end of the first amplifier, the non-inverting output end of the first amplifier is respectively connected with the non-inverting output end of the second amplifier and the non-inverting input end of the third amplifier, the inverting output end of the first amplifier is respectively connected with the inverting output end of the second amplifier and the inverting input end of the third amplifier, so that an output signal of the non-inverting output end of the first amplifier and an output signal of the non-inverting output end of the second amplifier are summed and then output to the non-inverting input end of the third amplifier, and meanwhile, an output signal of the inverting output end of the first amplifier and an output signal of the inverting output end of the second amplifier are summed and then output to the inverting input end of the; the output end of the third amplifier is connected with the input end of the feedback module, the first output end of the feedback module is connected with the inverting input end of the second amplifier, the second output end of the feedback module is connected with the non-inverting input end of the second amplifier, and the feedback module is used for adjusting the output signal of the second amplifier according to the summation result of the output signals, so that the input signal of the non-inverting input end of the third amplifier is equal in magnitude and opposite in polarity to the input signal of the inverting input end of the third amplifier.
Therefore, in practical application, by adopting the scheme of the invention, the output signals generated by amplifying the Hall voltage signals output by the Hall plate through the first amplifier and the third amplifier are fed back to the second amplifier through the feedback module so as to ensure that the input voltage signals of the non-inverting input end and the inverting input end of the third amplifier are equal in magnitude and opposite in polarity, the output signals generated by the second amplifier and the output signals generated by the first amplifier are summed, and the two paths of summed output signals are amplified by the third amplifier and then output, so that the Hall voltage signals are accurately amplified, and the operation is simple and convenient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a Hall amplifier in the prior art;
FIG. 2 is a schematic structural diagram of a Hall amplifier provided by the present invention;
FIG. 3 is a schematic structural diagram of another Hall amplifier provided by the invention;
FIG. 4 is a schematic structural diagram of another Hall amplifier provided by the invention;
FIG. 5 is a schematic structural diagram of another Hall amplifier provided by the invention;
FIG. 6 is a schematic structural diagram of another Hall amplifier provided by the invention;
fig. 7 is a schematic structural diagram of another hall amplifier provided by the present invention.
Detailed Description
The core of the invention is to provide a Hall amplifier, output signals generated after Hall voltage signals output by a Hall plate are amplified by a first amplifier and a third amplifier are fed back to a second amplifier by a feedback module to ensure that the output signals of the second amplifier are equal in size and opposite in polarity to the output signals of the first amplifier, the output signals generated by the second amplifier and the output signals generated by the first amplifier are summed, and the two paths of summed output signals are amplified by the third amplifier and then output, so that the Hall voltage signals are accurately amplified, and the operation is simple and convenient.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a hall amplifier provided in the present invention, including: hall plate 1 connected to a power supply, first amplifier A1A second amplifier A2Third amplifier A3A feedback module 2, wherein:
first output end of Hall plate 1 and first amplifier A1Is connected with the non-inverting input end of the Hall plate 1, and the second output end of the Hall plate 1 is connected with the first amplifier A1Is connected to the inverting input terminal of a first amplifier A1Respectively with the second amplifier A2In-phase output terminal and third amplifier A3Is connected to the non-inverting input terminal of a first amplifier A1Respectively with the second amplifier A2And the third amplifier A3Is connected to the inverting input of the first amplifier a so as to connect the first amplifier a to the inverting input of the second amplifier a1And the output signal of the non-inverting output terminal of the second amplifier A2The output signals of the in-phase output end are summed and then output to a third amplifier A3While the first amplifier a is connected to the non-inverting input of1And the output signal of the inverting output terminal of the first amplifier and the second amplifier A2The output signals of the inverting output end are summed and then output to a third amplifierAmplifier A3The inverting input terminal of (1);
third amplifier A3Is connected with the input of the feedback module 2, a first output of the feedback module 2 and a second amplifier a2Is connected with the inverting input terminal of the feedback module 2, and the second output terminal of the feedback module 2 is connected with the second amplifier A2Is connected to the non-inverting input of the first amplifier, a feedback module 2 for adjusting the second amplifier a in dependence on the result of the summation of the output signals2Is output signal of the third amplifier A3The input signal of the non-inverting input end and the input signal of the inverting input end are equal in magnitude and opposite in polarity.
Specifically, the Hall plate 1 outputs a Hall voltage signal VinThrough a first amplifier A1The output signal is generated and passed through a third amplifier A3And a feedback module 2, passing through a second amplifier A2The generated output signals are summed, and two paths of signals generated by summation pass through a third amplifier A3Amplified and then output to realize the Hall voltage signal VinAnd carrying out precise amplification.
In particular, the first amplifier A1Comprises a non-inverting input terminal, an inverting input terminal, a non-inverting output terminal, and a first amplifier A1The non-inverting input end and the inverting input end of the Hall voltage amplifier are respectively connected with the Hall plate 1 and used for receiving Hall voltage signals and carrying out first-stage amplification on the Hall voltage signals, and the second amplifier A2Comprises a non-inverting input terminal, an inverting input terminal, a non-inverting output terminal, and a second amplifier A2Is respectively connected with the feedback module 2, and is used for receiving the voltage signal output by the feedback module 2 and applying the voltage signal to the first amplifier A1And the second amplifier A2The output signals of the in-phase output terminal are summed while the first amplifier A is being operated1And the second amplifier a2The feedback module 2 sums the output signals of the two amplifier in-phase output ends and the output signals of the two amplifier anti-phase output ends according to the sum result of the output signals of the two amplifier in-phase output ends and the output signals of the two amplifier anti-phase output endsThe summation result of (a) is compared with a preset condition, and when the summation result does not meet the preset condition, the feedback module 2 adjusts the second amplifier a2The magnitude of the output signal at the output terminal to ensure the third amplifier A3The input voltage signal of the non-inverting input terminal and the input voltage signal of the inverting input terminal have the same magnitude and opposite polarity, and meet the actual amplification requirement, it can be understood that the feedback module 2 is a real-time feedback, and can be based on the third amplifier a3The output voltage signal of the output terminal of the first amplifier A adjusts the second amplifier A in real time2Output signal of the output terminal, the third amplifier A3The input voltage signals of the non-inverting input end and the inverting input end are equal in magnitude and opposite in polarity, and finally the third amplifier A is enabled3The static output voltage of the output terminal of (a) remains unchanged.
The invention provides a Hall amplifier, which comprises a Hall plate connected with a power supply, a first amplifier, a second amplifier, a third amplifier and a feedback module, wherein: the first output end of the Hall plate is connected with the non-inverting input end of the first amplifier, the second output end of the Hall plate is connected with the inverting input end of the first amplifier, the non-inverting output end of the first amplifier is respectively connected with the non-inverting output end of the second amplifier and the non-inverting input end of the third amplifier, the inverting output end of the first amplifier is respectively connected with the inverting output end of the second amplifier and the inverting input end of the third amplifier, so that an output signal of the non-inverting output end of the first amplifier and an output signal of the non-inverting output end of the second amplifier are summed and then output to the non-inverting input end of the third amplifier, and meanwhile, an output signal of the inverting output end of the first amplifier and an output signal of the inverting output end of the second amplifier are summed and then output to the inverting input end of the; the output end of the third amplifier is connected with the input end of the feedback module, the first output end of the feedback module is connected with the inverting input end of the second amplifier, the second output end of the feedback module is connected with the non-inverting input end of the second amplifier, and the feedback module is used for adjusting the output signal of the second amplifier according to the summation result of the output signals, so that the input signal of the non-inverting input end of the third amplifier is equal in magnitude and opposite in polarity to the input signal of the inverting input end of the third amplifier.
Therefore, in practical application, by adopting the scheme of the invention, the output signals generated by amplifying the Hall voltage signals output by the Hall plate through the first amplifier and the third amplifier are fed back to the second amplifier through the feedback module so as to ensure that the input voltage signals of the non-inverting input end and the inverting input end of the third amplifier are equal in magnitude and opposite in polarity, the output signals generated by the second amplifier and the output signals generated by the first amplifier are summed, and the two paths of summed output signals are amplified by the third amplifier and then output, so that the Hall voltage signals are accurately amplified, and the operation is simple and convenient.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another hall amplifier provided by the present invention, based on the above embodiment:
as a preferred embodiment, the first amplifier A1Is a first transconductance amplifier GM1A second amplifier A2Is a second transconductance amplifier GM2；
The hall amplifier further comprises a first resistor R1And a second resistor R2Wherein:
a first resistor R1First terminal of (1) and first transconductance amplifier GM1Is connected to the inverting output terminal of the second resistor R2First terminal of and second transconductance amplifier GM2Is connected with the same-phase output end of the first resistor R1Second terminal and second resistor R2And the second ends of the two are connected with the ground or the direct current power supply.
Specifically, the transconductance amplifier is an amplifier for converting an input differential voltage into an output current, and thus the first transconductance amplifier GM1The output signal of the in-phase output end is a current signal, and the in-phase output end is connected with a sixth resistor R6For the purpose of connecting the first transconductance amplifier GM1Current signal outputted from the in-phase output terminal of the first transconductance amplifier GM and the second transconductance amplifier GM2Current signal output by the same-phase output terminalThe sum of the signals is converted into a differential voltage signal and then connected to a third amplifier A3The non-inverting input terminal of the second transconductance amplifier GM2Similarly, by using a second transconductance amplifier GM2The inverting output end of the resistor is connected with a seventh resistor R7A first transconductance amplifier GM1The current signal output by the inverting output terminal of the second transconductance amplifier GM2The sum of the current signals output by the inverting output terminal of the first amplifier is converted into a differential voltage signal and then connected to a third amplifier A3The inverting input terminal of (1).
Referring to fig. 4, fig. 4 is a schematic structural diagram of another hall amplifier provided by the present invention, the hall amplifier is based on the above embodiment:
as a preferred embodiment, the feedback module 2 comprises a third resistor R3Fourth resistor R4Respectively connected to a third resistor R3And a fourth resistor R4Connected for obtaining a third resistance R3Terminal voltage and fourth resistance R4And also for adjusting the third resistance R3And the fourth resistor R4The management unit 21 of resistance value of (1), wherein:
third resistor R3As an input of the feedback module 2, a third resistor R3Respectively with a fourth resistor R4First terminal and second amplifier A2Is connected to the inverting input terminal of the fourth resistor R4Second terminal of and second amplifier A2Is connected to the non-inverting input terminal.
In particular, the third resistor R in the feedback module 23The resistance value and the voltage sensitivity (amplification factor) have a one-to-one correspondence relationship, and the management unit 21 may determine the third resistor R according to the actually required voltage sensitivity, i.e., the preset voltage sensitivity3And detecting the output voltage signal of the present hall amplifier to obtain the actual voltage sensitivity, i.e. according to the third resistor R obtained by the management unit 213The voltage value across (i.e. the third resistor R)3The terminal voltage of) the actual voltage sensitivity is calculated,according to the difference value between the actual voltage sensitivity and the preset voltage sensitivity, the second amplifier A is adjusted2The magnitude of the output signal of (1) so that the second amplifier A2And the first amplifier A1By changing the third resistance R, the sum of the output signals satisfies a predetermined condition3The voltage sensitivity is adjusted or modified by the resistance value, and the operation is convenient. Accordingly, only the third resistor R is described in the present embodiment3The fourth resistor R may be predetermined for the purpose of adjusting or modifying the voltage sensitivity4By adjusting the fourth resistor R4Or simultaneously adjusting the fourth resistance R4And a third resistor R3The purpose of adjusting or modifying the voltage sensitivity is achieved, but the invention is not limited thereto.
As a preferred embodiment, the first transconductance amplifier GM1Comprising a first transistor M1Second transistor M2A third transistor M3Fourth transistor M4Fifth resistor R5Second transconductance amplifier GM2Comprising a fifth transistor M5The sixth transistor M6The seventh transistor M7The eighth transistor M8A sixth resistor R6Wherein:
first transistor M1As a first transconductance amplifier GM1Non-inverting input terminal of, a second transistor M2As a first transconductance amplifier GM1The first transistor M1Respectively with a fifth resistor R5First terminal and third transistor M3Is connected to the first terminal of the second transistor M2Respectively with a fifth resistor R5Second terminal and fourth transistor M4Is connected to a first terminal of a first transistor M1Respectively connected with the power supply module and the third transistor M3Is connected to the control terminal of the third transistor M3As a first transconductance amplifier GM1The inverting output terminal of (1), the second transistor M2Respectively connected with the power module and the fourth transistor M4Is connected to the control terminal of the fourth transistor M4As a first transconductance amplifier GM1The same-phase output terminal of (1);
fifth transistor M5As a second transconductance amplifier GM2The non-inverting input terminal of (1), a sixth transistor M6As a second transconductance amplifier GM2Of the fifth transistor M5Respectively with a sixth resistor R6First terminal and seventh transistor M7Is connected to the first terminal of the sixth transistor M6Respectively with a sixth resistor R6Second terminal and eighth transistor M8Is connected to the first terminal of the fifth transistor M5Respectively connected with the power module and the seventh transistor M7Is connected to the control terminal of the seventh transistor M7Is used as a second transconductance amplifier GM2The sixth transistor M6Respectively connected with the power module and the eighth transistor M8Is connected to the control terminal of an eighth transistor M8Is used as a second transconductance amplifier GM2The non-inverting output terminal.
Specifically, referring to fig. 5, fig. 5 is a schematic structural diagram of another hall amplifier provided by the present invention, in which in fig. 5, the first transistor M1To eighth transistor M8The structure of the hall voltage compensation circuit is represented by a triode structure, and it should be noted in advance that the temperature coefficient of the hall voltage signal provided by the hall plate 1 is negative, and the output voltage signal required by the hall amplifier is zero temperature coefficient, so the negative temperature coefficient of the hall voltage signal is generally compensated by the positive temperature coefficient of the resistor in the prior art, that is, the respective corresponding weight values are set for the resistors in advance to compensate the negative temperature coefficient of the hall voltage signal, as the hall amplifier structure mentioned in the background art, refer to fig. 1, wherein the types of the resistors are different and have different temperature coefficients respectively, or each resistor is composed of resistors with different temperature coefficients, so the hall voltage compensation circuit is switched onWhen the amplification factor of the hall amplifier is changed by changing the resistance value of the resistor, the temperature coefficient corresponding to the resistor is changed once the resistance value of the resistor is changed, and the weight of each resistor is fixed, so that the temperature coefficient of the output voltage signal of the hall amplifier is influenced.
Considering so far, the fifth resistor R adopted by the present invention5And a sixth resistor R6Each having a single, independent temperature coefficient, i.e. varying the fifth resistance R5Or a sixth resistance R6The resistance value of (2) does not affect the temperature coefficient thereof, and generally, in combination with the previous embodiment, the third resistor R is adjusted3The voltage sensitivity can be understood as coarse adjustment of the voltage sensitivity, in this embodiment, by adjusting the sixth resistor R6The resistance value of (2) can realize fine adjustment of voltage sensitivity. Specifically, the target voltage sensitivity is determined according to actual needs, and then the third resistor R is adjusted according to the target voltage sensitivity3Detecting the output voltage signal of the Hall amplifier to obtain the current voltage sensitivity, calculating the difference between the current voltage sensitivity and the target voltage sensitivity to obtain the resistance difference, and adjusting the sixth resistor R according to the resistance difference6So that the voltage sensitivity of the voltage signal output by the output end of the Hall amplifier reaches the target voltage sensitivity.
Specifically, under the above structure, the first transconductance amplifier GM1Transconductance of (1)Second transconductance amplifier GM2Transconductance of (1)Voltage signal V at output terminaloutHall voltage signal V of input endinHas the relation ofThe temperature coefficient of each item of the above relation is calculated to be a deviation derivative, and the temperature coefficient relation isWherein, by adjusting the third resistance R3A fourth resistor R4A fifth resistor R5A sixth resistor R6Output signal V capable of reaching zero temperature coefficientOUTBy adjusting the third resistance R3And a sixth resistor R6When the amplification precision and the voltage sensitivity are adjusted, the third resistor R is used3Has a known temperature coefficient of resistance R6The temperature coefficient is fixed, therefore, the output voltage signal V is not changedOUTTemperature coefficient of (3), third resistance R3A fourth resistor R4A fifth resistor R5A sixth resistor R6All can be adjustable resistors, and in order to realize linear adjustment, the invention adopts the adjustment of the third resistor R3And a sixth resistor R6The amplification precision of the Hall amplifier can be changed, of course, the fourth resistor R can be adjusted4A sixth resistor R6The amplification precision of the hall amplifier is changed, and the invention is not limited to this.
As a preferred embodiment, the first transconductance amplifier GM1Comprises a ninth transistor M9The tenth transistor M10An eleventh transistor M11The twelfth transistor M12Seventh resistor R7Second transconductance amplifier GM2Comprising a thirteenth transistor M13The fourteenth transistor M14The fifteenth transistor M15The sixteenth transistor M16Eighth resistor R8Wherein:
eleventh transistor M11As a first transconductance amplifier GM1Of the non-inverting input terminal of the twelfth transistor M12As a first transconductance amplifier GM1Of the eleventh transistor M11First terminal and ninth transistor M9Is connected to the control terminal of the eleventh transistor M11Respectively with the ninth transistor M9First terminal, seventh resistor R7Is connected with the power supply module, a ninth transistor M9As a first transconductance amplifier GM1Of the inverting output terminal of the twelfth transistor M12Respectively with a seventh resistor R7Second terminal, power module and tenth transistor M10Is connected to the first terminal of the twelfth transistor M12First terminal and tenth transistor M10Is connected to the control terminal of the tenth transistor M10As a first transconductance amplifier GM1The same-phase output terminal of (1);
fifteenth transistor M15As a second transconductance amplifier GM2The non-inverting input terminal of (1), the sixteenth transistor M16As a second transconductance amplifier GM2Of the fifth transistor M15First terminal and thirteenth transistor M13Is connected to the control terminal of a fifteenth transistor M15Second terminals of the first and second transistors are connected with a thirteenth transistor M13First terminal, eighth resistor R8Is connected to the power supply module, a thirteenth transistor M13Is used as a second transconductance amplifier GM2The sixteenth transistor M16Respectively with an eighth resistor R8Second terminal, power module and fourteenth transistor M14Is connected to the sixteenth transistor M16First terminal and fourteenth transistor M14Is connected to the control terminal of the fourteenth transistor M14Is used as a second transconductance amplifier GM2The non-inverting output terminal.
Specifically, referring to fig. 6, fig. 6 is a schematic structural diagram of another hall amplifier provided by the present invention, and in fig. 6, a ninth transistor M9To the sixteenth transistor M16The structure of (1) is represented by a triode structure, wherein the seventh resistor R7And an eighth resistor R8Each having a single, independent temperature coefficient, i.e. varying the seventh resistance R7Or an eighth resistor R8Resistance value of without affecting temperature coefficient thereof
Specifically, under the above structure, the first transconductance amplifier GM1Transconductance of (1)Second transconductance amplifier GM2Transconductance of (1)Voltage signal V at output terminaloutHall voltage signal V of input endinHas the relation ofThe temperature coefficient of each item of the above relation is calculated to be a deviation derivative, and the temperature coefficient relation isWherein, by adjusting the third resistance R3A fourth resistor R4A seventh resistor R7An eighth resistor R8Output signal V capable of reaching zero temperature coefficientOUTBy adjusting the third resistance R3And an eighth resistor R8When the amplification precision and the voltage sensitivity are adjusted, the output signal V is not changedOUTTemperature coefficient of (3), third resistance R3A fourth resistor R4A seventh resistor R7An eighth resistor R8Are all adjustable resistorsIn order to realize linear adjustment, the invention adopts the adjustment of the third resistor R3And an eighth resistor R8The amplification precision of the Hall amplifier can be changed, of course, the fourth resistor R can be adjusted4A seventh resistor R7The amplification precision of the hall amplifier is changed, and the invention is not limited to this.
As a preferred embodiment, the first transistor M1A second transistor M2A fifth transistor M5And a sixth transistor M6All are NPN type triodes, wherein:
the base of NPN type triode is used as the first transistor M1A second transistor M2A fifth transistor M5And a sixth transistor M6The collector of the NPN type triode is used as the first transistor M1A second transistor M2A fifth transistor M5And a sixth transistor M6The emitter of the NPN type triode is used as a first transistor M1A second transistor M2A fifth transistor M5And a sixth transistor M6A second end of (a);
third transistor M3A fourth transistor M4The seventh transistor M7And an eighth transistor M8Are PNP type triodes, wherein:
the base electrode of the PNP type triode is used as a third transistor M3A fourth transistor M4The seventh transistor M7And an eighth transistor M8The collector of the PNP type triode is used as a third transistor M3A fourth transistor M4The seventh transistor M7And an eighth transistor M8The emitter of the PNP type triode is used as the third transistor M3A fourth transistor M4The seventh transistor M7And an eighth transistor M8The second end of (a).
As a preferred embodiment, a ninth transistor M9The tenth transistor M10A thirteenth transistorM13And a fourteenth transistor M14Are PNP type triodes, wherein:
the base electrode of the PNP type triode is used as a ninth transistor M9The tenth transistor M10Thirteenth transistor M13And a fourteenth transistor M14The collector of the PNP type triode is used as a ninth transistor M9The tenth transistor M10Thirteenth transistor M13And a fourteenth transistor M14The emitter of the PNP type triode is used as a ninth transistor M9The tenth transistor M10Thirteenth transistor M13And a fourteenth transistor M14A second end of (a);
eleventh transistor M11The twelfth transistor M12Fifteenth transistor M15And a sixteenth transistor M16All are NPN type triodes, wherein:
the base of NPN type triode is used as the eleventh transistor M11The twelfth transistor M12Fifteenth transistor M15And a sixteenth transistor M16The collector of the NPN type triode is used as an eleventh transistor M11The twelfth transistor M12Fifteenth transistor M15And a sixteenth transistor M16An emitter of the NPN type triode is used as an eleventh transistor M11The twelfth transistor M12Fifteenth transistor M15And a sixteenth transistor M16The second end of (a).
Of course, besides the transistors, CMOS transistors or other transistors may be selected according to actual engineering requirements, as long as the above functions are realized.
Referring to fig. 7, fig. 7 is a schematic structural diagram of another hall amplifier provided by the present invention, the hall amplifier is based on the above structure:
as a preferred embodiment, the third resistor R3Including a plurality ofResistors with different resistance values are connected in series/in parallel.
In particular, the third resistor R can be connected3The resistors of different values are connected in series, as shown in fig. 7, and the third resistor R3Three resistors with different resistances, namely R3_1, R3_2 and R3_3, can be included in series, and the voltage sensitivity of the output voltage signal Vout can be conveniently modified by selecting in an Option mode.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The Hall amplifier is characterized by comprising a Hall plate connected with a power supply, a first amplifier, a second amplifier, a third amplifier and a feedback module, wherein:
the first output end of the Hall plate is connected with the non-inverting input end of the first amplifier, the second output end of the Hall plate is connected with the inverting input end of the first amplifier, the non-inverting output end of the first amplifier is respectively connected with the non-inverting output end of the second amplifier and the non-inverting input end of the third amplifier, the inverting output end of the first amplifier is respectively connected with the inverting output end of the second amplifier and the inverting input end of the third amplifier, so as to sum the output signal of the non-inverting output terminal of the first amplifier and the output signal of the non-inverting output terminal of the second amplifier and output the sum to the non-inverting input terminal of the third amplifier, meanwhile, the output signal of the inverting output end of the first amplifier and the output signal of the inverting output end of the second amplifier are summed and then output to the inverting input end of the third amplifier;
the output end of the third amplifier is connected with the input end of the feedback module, the first output end of the feedback module is connected with the inverting input end of the second amplifier, and the second output end of the feedback module is connected with the non-inverting input end of the second amplifier; the feedback module is configured to adjust the output signal of the second amplifier according to the summation result of the output signals, so that the input signal of the non-inverting input terminal of the third amplifier is equal in magnitude and opposite in polarity to the input signal of the inverting input terminal of the third amplifier.
2. The hall amplifier of claim 1, wherein the first amplifier is a first transconductance amplifier and the second amplifier is a second transconductance amplifier;
the hall amplifier further comprises a first resistor and a second resistor, wherein:
the first end of the first resistor is connected with the inverted output end of the first transconductance amplifier, the first end of the second resistor is connected with the non-inverted output end of the second transconductance amplifier, and the second end of the first resistor and the second end of the second resistor are both connected with the ground or a direct-current power supply.
3. The hall amplifier of claim 1, wherein the feedback module comprises a third resistor, a fourth resistor, a management unit connected to the third resistor and the fourth resistor respectively, and configured to obtain a terminal voltage of the third resistor and a terminal voltage of the fourth resistor, and further configured to adjust a resistance of the third resistor and a resistance of the fourth resistor, wherein:
the first end of the third resistor is used as the input end of the feedback module, the second end of the third resistor is respectively connected with the first end of the fourth resistor and the inverting input end of the second amplifier, and the second end of the fourth resistor is connected with the non-inverting input end of the second amplifier.
4. The hall amplifier of claim 2 wherein the first transconductance amplifier comprises a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth resistor, and wherein the second transconductance amplifier comprises a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, and a sixth resistor, and wherein:
the control end of the first transistor is used as the non-inverting input end of the first transconductance amplifier, the control end of the second transistor is used as the inverting input end of the first transconductance amplifier, a second end of the first transistor is respectively connected with a first end of the fifth resistor and a first end of the third transistor, a second terminal of the second transistor is connected to a second terminal of the fifth resistor and a first terminal of the fourth transistor, the first end of the first transistor is respectively connected with the power module and the control end of the third transistor, a second end of the third transistor is used as an inverted output end of the first transconductance amplifier, a first end of the second transistor is respectively connected with the power module and a control end of the fourth transistor, and a second end of the fourth transistor is used as a non-inverted output end of the first transconductance amplifier;
a control terminal of the fifth transistor is used as a non-inverting input terminal of the second transconductance amplifier, a control terminal of the sixth transistor is used as an inverting input terminal of the second transconductance amplifier, a second end of the fifth transistor is connected to a first end of the sixth resistor and a first end of the seventh transistor respectively, a second terminal of the sixth transistor is connected to a second terminal of the sixth resistor and a first terminal of the eighth transistor, the first end of the fifth transistor is respectively connected with the power module and the control end of the seventh transistor, a second end of the seventh transistor is used as an inverted output end of the second transconductance amplifier, a first end of the sixth transistor is respectively connected with the power module and a control end of the eighth transistor, and a second end of the eighth transistor is used as a non-inverted output end of the second transconductance amplifier.
5. The hall amplifier of claim 2 wherein the first transconductance amplifier includes a ninth transistor, a tenth transistor, an eleventh transistor, a twelfth transistor, and a seventh resistor, and wherein the second transconductance amplifier includes a thirteenth transistor, a fourteenth transistor, a fifteenth transistor, a sixteenth transistor, and an eighth resistor, and wherein:
a control terminal of the eleventh transistor serves as a non-inverting input terminal of the first transconductance amplifier, a control terminal of the twelfth transistor serves as an inverting input terminal of the first transconductance amplifier, a first end of the eleventh transistor is connected to the control end of the ninth transistor, a second end of the eleventh transistor is connected to the first end of the ninth transistor, the first end of the seventh resistor, and the power module, respectively, a second end of the ninth transistor is used as an inverting output end of the first transconductance amplifier, a second end of the twelfth transistor is respectively connected with a second end of the seventh resistor, the power supply module and a first end of the tenth transistor, a first end of the twelfth transistor is connected with a control end of the tenth transistor, and a second end of the tenth transistor is used as a non-inverting output end of the first transconductance amplifier;
a control terminal of the fifteenth transistor serves as a non-inverting input terminal of the second transconductance amplifier, a control terminal of the sixteenth transistor serves as an inverting input terminal of the second transconductance amplifier, a first end of the fifteenth transistor is connected to the control end of the thirteenth transistor, a second end of the fifteenth transistor is connected to the first end of the thirteenth transistor, the first end of the eighth resistor, and the power module, respectively, a second end of the thirteenth transistor is used as an inverting output end of the second transconductance amplifier, a second end of the sixteenth transistor is respectively connected with a second end of the eighth resistor, the power module and a first end of the fourteenth transistor, a first end of the sixteenth transistor is connected to a control end of the fourteenth transistor, and a second end of the fourteenth transistor is used as a non-inverting output end of the second transconductance amplifier.
6. The Hall amplifier according to claim 4, wherein the first transistor, the second transistor, the fifth transistor and the sixth transistor are NPN transistors, wherein:
a base of the NPN type triode is used as a control terminal of the first transistor, the second transistor, the fifth transistor, and the sixth transistor, a collector of the NPN type triode is used as a first terminal of the first transistor, the second transistor, the fifth transistor, and the sixth transistor, and an emitter of the NPN type triode is used as a second terminal of the first transistor, the second transistor, the fifth transistor, and the sixth transistor;
the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor are all PNP-type triodes, wherein:
a base of the PNP transistor is used as a control terminal of the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor, a collector of the PNP transistor is used as a first terminal of the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor, and an emitter of the PNP transistor is used as a second terminal of the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor.
7. The Hall amplifier according to claim 5, wherein the ninth transistor, the tenth transistor, the thirteenth transistor and the fourteenth transistor are PNP type transistors, wherein:
the base electrode of the PNP type triode is used as the control terminal of the ninth transistor, the tenth transistor, the thirteenth transistor and the fourteenth transistor, the collector electrode of the PNP type triode is used as the first terminal of the ninth transistor, the tenth transistor, the thirteenth transistor and the fourteenth transistor, and the emitter electrode of the PNP type triode is used as the second terminal of the ninth transistor, the tenth transistor, the thirteenth transistor and the fourteenth transistor;
the eleventh transistor, the twelfth transistor, the fifteenth transistor, and the sixteenth transistor are all NPN transistors, wherein:
a base of the NPN transistor serves as a control terminal of the eleventh, twelfth, fifteenth and sixteenth transistors, a collector of the NPN transistor serves as a first terminal of the eleventh, twelfth, fifteenth and sixteenth transistors, and an emitter of the NPN transistor serves as a second terminal of the eleventh, twelfth, fifteenth and sixteenth transistors.
8. The Hall amplifier according to claim 1, wherein the third resistor comprises a plurality of resistors of different resistances connected in series/in parallel.
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