CN109067367B - Hall signal amplifying circuit - Google Patents
Hall signal amplifying circuit Download PDFInfo
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- CN109067367B CN109067367B CN201811088232.1A CN201811088232A CN109067367B CN 109067367 B CN109067367 B CN 109067367B CN 201811088232 A CN201811088232 A CN 201811088232A CN 109067367 B CN109067367 B CN 109067367B
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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 Hall signal amplifying circuit, which comprises a Hall sensor module, a first amplifier, a second amplifier, a third amplifier, a compensation module, a first output end of the Hall sensor module and an in-phase input end of the first amplifier, wherein the Hall sensor module is connected with the first output end of the Hall sensor module, the second output end of the Hall sensor module is connected with an anti-phase input end of the first amplifier, the in-phase output end of the first amplifier is respectively connected with the in-phase output end of the second amplifier and the in-phase input end of the third amplifier, the anti-phase output end of the first amplifier is respectively connected with the anti-phase output end of the second amplifier and the anti-phase input end of the third amplifier, the first output end of the compensation module is connected with the in-phase input end of the second amplifier, and the second output end of the compensation module is connected with the anti-phase input end of the second amplifier. The invention generates equivalent input offset voltage related to thermal voltage through the compensation module, and has good temperature compensation function while eliminating operational amplifier offset voltage.
Description
Technical Field
The invention relates to the field of amplifiers, in particular to a Hall signal amplifying circuit.
Background
In the process of amplifying the Hall signal, the static output voltage (under the condition of zero magnetic field) is not at the midpoint potential under the influence of the offset voltage of the operational amplifier, so that the application of the static output voltage in a high-precision speed detection sensor and a high-precision position detection sensor is influenced. In order to reduce the influence of offset voltage of operational amplifier, the conventional hall signal amplifying circuit generally adopts the instrument amplifier structure shown in fig. 1, and comprises a hall sensor module 01 for outputting hall signals, and a first operational amplifier OPA 1 Second operational amplifier OPA 2 Third operational amplifier OPA 3 A first resistor, a second resistor, and a seventh resistor, wherein the first resistor is denoted as R 0 The second resistance and the third resistance are the same and are all marked as R 01 Fourth and fifth resistive phasesIn the same way, all are marked as R 02 The sixth resistance is the same as the seventh resistance and is denoted as R 03 Although the symmetrical structure can reduce the influence of the offset voltage of the operational amplifier to a certain extent, the offset voltage of the operational amplifier cannot be completely eliminated. In order to achieve the effect of offset voltage of the operational amplifier, the Hall signal amplifying circuit further comprises an adjusting module 02 for adjusting the reference voltage V REF The offset voltage of the operational amplifier is offset, but the offset voltage of the operational amplifier in the Hall signal amplifying circuit is also changed along with the temperature change, and the temperature coefficient of the offset voltage of the operational amplifier and the thermal voltage V in the amplifying circuit are considered T The offset is difficult to be carried out through the temperature coefficient of the independent resistor, so that the scheme in the prior art has no good temperature compensation effect on the operational amplifier offset voltage in the Hall amplifying circuit, and cannot ensure that the static output voltage has high precision in the full-temperature working range.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The invention aims to provide a Hall signal amplifying circuit, which generates equivalent input offset voltage related to thermal voltage through a compensation module, has good temperature compensation function while eliminating operational amplifier offset voltage, and ensures that static output voltage has high precision in a full-temperature working range.
In order to solve the technical problems, the invention provides a Hall signal amplifying circuit, which comprises a Hall sensor module, a first amplifier, a second amplifier, a third amplifier and a compensation module, wherein the Hall sensor module is connected with a power supply, the second amplifier is identical to the first amplifier in structure, and the compensation module comprises:
the first output end of the Hall sensor module is connected with the non-inverting input end of the first amplifier, the second output end of the Hall sensor module 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, the first output end of the compensation module is connected with the non-inverting input end of the second amplifier, and the second output end of the compensation module is connected with the inverting input end of the second amplifier;
The compensation module is used for determining a reference current related to the thermal voltage, obtaining an equivalent input offset voltage which is equal to the input offset voltage in size and opposite in polarity and related to the thermal voltage according to the reference current and the acquired input offset voltage, and outputting the equivalent input offset voltage to the second amplifier.
Preferably, the compensation module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, a first fuse, a second fuse, wherein:
the first end of the first resistor is connected with the first end of the third resistor and the first end of the fourth resistor respectively, the common end of the first resistor is connected with the power supply, the second end of the first resistor is connected with the first end of the first transistor, the control end of the first transistor and the control end of the second transistor respectively, the second end of the first transistor is connected with the first end of the third transistor and the control end of the fourth transistor respectively, the control end of the third transistor is connected with the first end of the fourth transistor and the second end of the second transistor respectively, the second end of the fourth transistor is connected with the first end of the second resistor, the first end of the second transistor is connected with the first end of the fifth transistor, the control end of the seventh transistor, the control end of the eighth transistor and the control end of the ninth transistor respectively, the second end of the fifth transistor is connected with the second end of the third resistor, the control end of the fifth transistor is respectively connected with the second end of the seventh transistor and the control end of the sixth transistor, the second end of the sixth transistor is connected with the second end of the fourth resistor, the first end of the sixth transistor is respectively connected with the second end of the eighth transistor and the second end of the ninth transistor, the first end of the eighth transistor is respectively connected with the first end of the fifth resistor and the first end of the first fuse, the common end of the eighth transistor is used as the second output end of the compensation module, the first end of the ninth transistor is respectively connected with the second end of the fifth resistor and the first end of the second resistor, the common end of the eighth transistor is used as the first output end of the compensation module, the second end of the third transistor, the first end of the seventh transistor and the second end of the second resistor are all grounded;
The compensation module further comprises a control unit which is respectively connected with the fifth resistor, the first fuse wire and the second fuse wire, is used for adjusting the resistance value of the fifth resistor to control the voltage on the fifth resistor to be equal to the input offset voltage, and is also used for controlling the fusing of the first fuse wire and the second fuse wire to control the equivalent input offset voltage to be opposite to the input offset voltage in polarity;
the second resistor is the same as the third resistor, the fourth resistor and the fifth resistor.
Preferably, the first amplifier is a first transconductance amplifier, and the second amplifier is a second transconductance amplifier;
the hall signal amplification circuit further includes:
a sixth resistor with a first end connected with the in-phase output end of the first transconductance amplifier and a second end connected with AC ground;
and a seventh resistor with a first end connected with the inverting output end of the second transconductance amplifier and a second end connected with alternating current ground.
Preferably, each of the first transconductance amplifier and the second transconductance amplifier includes an eighth resistor, a ninth resistor up to a thirteenth resistor, a tenth transistor, an eleventh transistor up to a twenty-fifth transistor, wherein:
The first end of the eighth resistor is connected with the first end of the tenth resistor, the first end of the eleventh resistor and the first end of the twelfth resistor respectively, the common end of the eighth resistor is connected with the power supply, the second end of the eighth resistor is connected with the first end of the tenth transistor, the control end of the tenth transistor and the control end of the eleventh transistor respectively, the second end of the tenth transistor is connected with the first end of the twelfth transistor and the control end of the thirteenth transistor respectively, the control end of the twelfth transistor is connected with the first end of the thirteenth transistor and the second end of the eleventh transistor respectively, the second end of the thirteenth transistor is connected with the first end of the ninth resistor, the first end of the eleventh transistor is connected with the control end of the fifteenth transistor and the first end of the fourteenth transistor respectively, the second end of the fourteenth transistor is connected with the second end of the tenth resistor, the control end of the fourteenth transistor is connected with the second end of the fifteenth transistor, the control end of the sixteenth transistor and the control end of the eighteenth transistor, the second end of the sixteenth transistor is connected with the second end of the eleventh resistor, the first end of the sixteenth transistor is connected with the first end of the nineteenth transistor, the control end of the twentieth transistor and the control end of the twenty first transistor, the second end of the seventeenth transistor is connected with the second end of the eighteenth transistor and the second end of the twelfth resistor, the first end of the seventeenth transistor is connected with the first end of the twenty fourth transistor, the first end of the eighteenth transistor is connected with the first end of the twenty-third transistor and the control end of the twenty-fifth transistor respectively, the second end of the twenty-third transistor is connected with the first end of the thirteenth resistor, the first end of the twenty-fourth transistor and the first end of the twenty-fourth transistor respectively, the control end of the twenty-fourth transistor is used as the non-inverting input end of the first transconductance amplifier and the second transconductance amplifier, the second end of the twenty-fifth transistor is connected with the first end of the twenty-fifth transistor, the second end of the thirteenth resistor and the first end of the twenty-first transistor respectively, the control end of the twenty-fourth transistor is used as the inverting input end of the first transconductance amplifier and the second transconductance amplifier, the second end of the twenty-fifth transistor is used as the non-inverting output end of the first transconductance amplifier and the second transconductance amplifier, and the second end of the twenty-fifth transistor is used as the non-inverting input end of the first transconductance amplifier and the twenty-fifth transistor.
Preferably, each of the first transconductance amplifier and the second transconductance amplifier includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a twenty-sixth transistor, and a twenty-seventh transistor up to a forty-first transistor, wherein:
the first end of the fourteenth resistor is connected with the second end of the thirty-eighth transistor, the second end of the thirty-third transistor and the second end of the thirty-fourth transistor respectively, the common end of the thirty-eighth transistor is connected with the power supply, the second end of the fourteenth resistor is connected with the first end of the twenty-sixth transistor, the control end of the thirty-sixth transistor and the control end of the thirty-seventh transistor respectively, the second end of the twenty-sixth transistor is connected with the first end of the thirty-eighth transistor and the control end of the thirty-eighth transistor respectively, the control end of the twenty-eighth transistor is connected with the first end of the twenty-ninth transistor and the second end of the twenty-seventh transistor respectively, the second end of the twenty-seventh transistor is connected with the first end of the thirty-seventh resistor, the control end of the thirty-seventh transistor, the thirty-first end of the thirty-third transistor is connected with the control end of the thirty-fifth transistor, the thirty-fifth transistor and the thirty-fifth end of the thirty-seventh transistor respectively, the thirty-first end of the thirty-seventh transistor is connected with the control end of the thirty-third transistor and the thirty-fifth end of the thirty-seventh transistor respectively, the thirty-seventh end of the thirty-seventh transistor and the thirty-seventh end of the thirty-seventh transistor is connected with the first end of the thirty-seventh transistor respectively, the control end of the thirty-seventh transistor and the thirty-seventh transistor is connected with the first end of the thirty-seventh transistor and the thirty-eighth end of the thirty transistor respectively, the first end of the thirty-fourth transistor is respectively connected with the first end of the eighteenth resistor, the second end of the fortieth transistor and the first end of the thirty-eighth transistor, the first end of the fortieth transistor is respectively connected with the control end of the thirty-eighth transistor and the first end of the thirty-sixth transistor, the first end of the thirty-fourth transistor is respectively connected with the second end of the eighteenth resistor, the second end of the fortieth first transistor and the first end of the thirty-ninth transistor, the first end of the fortieth first transistor is respectively connected with the control end of the thirty-ninth transistor and the first end of the thirty-seventh transistor, the control end of the fortieth transistor is used as the in-phase input end of the first transconductance amplifier and the second transconductance amplifier, the control end of the fortieth transistor is used as the out-phase input end of the first transconductance amplifier and the second transconductance amplifier, the second end of the thirty-eighth transistor is used as the in-phase input end of the first transconductance amplifier and the second transconductance amplifier, the fortieth end of the thirty-eighth transistor is used as the in-phase input end of the first transconductance amplifier and the second transconductance amplifier, and the fortieth end of the thirty-eighth amplifier.
Preferably, the hall signal amplification circuit further includes a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, wherein:
the first end of the nineteenth resistor is connected with the in-phase output end of the first amplifier, the second end of the nineteenth resistor is respectively connected with the in-phase input end of the third amplifier and the first end of the twenty first resistor, the first end of the twentieth resistor is connected with the inverting output end of the first amplifier, the second end of the twentieth resistor is respectively connected with the inverting input end of the third amplifier and the first end of the twenty second resistor, and the second end of the twenty second resistor is connected with the output end of the third amplifier.
Preferably, the first transistor, the second transistor, and the up to the twenty-fifth transistor are all transistors.
Preferably, the twenty-sixth transistor, and the twenty-seventh transistor through the forty-first transistor are transistors.
The invention provides a Hall signal amplifying circuit, which comprises a Hall sensor module, a first amplifier, a second amplifier, a third amplifier and a compensation module, wherein the Hall sensor module is connected with a power supply, the second amplifier and the third amplifier have the same structure as the first amplifier, and the compensation module comprises the following components: the first output end of the Hall sensor module is connected with the in-phase input end of the first amplifier, the second output end of the Hall sensor module is connected with the in-phase input end of the first amplifier, the in-phase output end of the first amplifier is respectively connected with the in-phase output end of the second amplifier and the in-phase input end of the third amplifier, the first output end of the compensation module is connected with the in-phase input end of the second amplifier, and the second output end of the compensation module is connected with the in-phase input end of the second amplifier; and the compensation module is used for determining the reference current related to the thermal voltage, obtaining the equivalent input offset voltage which is equal to the input offset voltage in magnitude and opposite in polarity and related to the thermal voltage according to the reference current and the acquired input offset voltage, and outputting the equivalent input offset voltage to the second amplifier. Therefore, in practical application, the scheme of the invention is adopted, the equivalent input offset voltage related to the thermal voltage is generated through the compensation module, the offset voltage of the operational amplifier is eliminated, and meanwhile, the temperature compensation function is good, so that the static output voltage has high precision in the full-temperature working range.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a hall signal amplifying circuit in the prior art;
fig. 2 is a schematic structural diagram of a hall signal amplifying circuit according to the present invention;
FIG. 3 is a schematic diagram of a compensation module according to the present invention;
fig. 4 is a schematic structural diagram of another hall signal amplifying circuit according to the present invention;
fig. 5 is a schematic diagram of a transconductance amplifier according to the present invention;
fig. 6 is a schematic diagram of another transconductance amplifier according to the present invention;
fig. 7 is a schematic structural diagram of an embodiment of a hall amplifying signal circuit according to the present invention.
Detailed Description
The core of the invention is to provide a Hall signal amplifying circuit, which generates equivalent input offset voltage related to thermal voltage through a compensation module, and has good temperature compensation function while eliminating operational amplifier offset voltage, so that static output voltage has high precision in the full temperature working range.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a hall signal amplifying circuit according to the present invention, which includes a hall sensor module 1 connected to a power source VCC, a first amplifier a 1 With the first amplifier A 1 Second amplifier A with same structure 2 Third amplifier A 3 A compensation module 2, wherein:
a first output of the hall sensor module 1 and a first amplifier a 1 Is connected to the non-inverting input of the Hall sensor module 1, the second output of the Hall sensor module 1 is connected to the first amplifier A 1 Is connected with the inverting input terminal of the first amplifier A 1 Respectively with the in-phase output end of the second amplifier A 2 Is connected to the in-phase output terminal of the third amplifier A 3 Is connected with the non-inverting input terminal of the first amplifier A 1 Respectively with the second amplifier A 2 Is connected to the inverting output terminal of the third amplifier A 3 Is connected to the inverting input of the compensation module 2, the first output of which is connected to the second amplifier A 2 Is connected to the non-inverting input of the compensation module 2 and the second amplifier A 2 Is connected with the inverting input end of the power supply;
the compensation module 2 is used for determining a reference current related to the thermal voltage, obtaining an equivalent input offset voltage which is equal to the input offset voltage in magnitude and opposite in polarity and related to the thermal voltage according to the reference current and the obtained input offset voltage, and outputting the equivalent input offset voltage to the second amplifier A 2 。
Specifically, the power supply VCC supplies power to the hall sensor to make the hall sensor module 1 output a hall signal, and the hall signal passes through the first amplifier a 1 After amplification, output to the third amplifier A 3 Second-stage amplification is carried out, and a first amplifier A 1 And a second amplifier A 2 Is completely identical in structure, the first amplifier A 1 The output signal of (a) is divided into two paths, one path is output from the in-phase output end of the amplifier and the other path is output from the reverse-phase output end of the amplifier, and the second amplifier A 2 And the same applies to the output signal of (a). In the above configuration, the slave first amplifier a 1 Output signal from in-phase output terminal of (a) and output signal from second amplifier A 2 The output signals output by the in-phase output end of the (B) are added and then are connected into a third amplifier A 3 In the same phase as the input terminal of the first amplifier A 1 An output signal outputted from the inverting output terminal of the second amplifier A 2 The output signals output by the inverting output end of the first amplifier A are added up and then are connected into the third amplifier A 3 By detecting the inverting input terminal of the third amplifier A 3 Static output voltage V at the output terminal of (2) OUT Output offset voltage VOS can be obtained out The calculation relation between the static output voltage and the output offset voltage is VOS out ＝V out -V cc 2, wherein V cc Input offset voltage VOS of operational amplifier for power supply voltage in Is VOS in ＝VOS out A is the output port of the Hall sensor module 1 to the third amplifier A 3 Due to the gain of the output of the first amplifier A 1 And a second amplifier A 2 The structure of (2) is identical, and therefore the output port of the compensation module 2 goes to the third amplifier a 3 The gain at the output of (a) is also a, that is, as long as offset voltage VOS is generated and input in compensation module 2 in The effect of the operational amplifier offset voltage can be completely eliminated by the equivalent input offset voltages with equal and opposite polarities, and the temperature coefficient of the operational amplifier offset voltage is considered to be related to the thermal voltage, so the invention predefines the reference current related to the thermal voltage through the compensation module 2, generates the equivalent input offset voltage related to the thermal voltage through the reference current, and simultaneously calculates the input offset voltage VOS in The magnitude and polarity of the equivalent input offset voltage are adjusted to enable the equivalent input offset voltage and the input offset voltage VOS to be equivalent in Equal in size and opposite in polarity.
In summary, the invention generates equivalent input offset voltage related to thermal voltage through the compensation module 2, has good temperature compensation function while eliminating operational amplifier offset voltage, and can adjust static output voltage to midpoint potential to enable the static output voltage V OUT All have the following characteristics in the full-temperature working rangeHigh precision.
The invention provides a Hall signal amplifying circuit, which comprises a Hall sensor module, a first amplifier, a second amplifier, a third amplifier and a compensation module, wherein the Hall sensor module is connected with a power supply, the second amplifier and the third amplifier have the same structure as the first amplifier, and the compensation module comprises the following components: the first output end of the Hall sensor module is connected with the in-phase input end of the first amplifier, the second output end of the Hall sensor module is connected with the in-phase input end of the first amplifier, the in-phase output end of the first amplifier is respectively connected with the in-phase output end of the second amplifier and the in-phase input end of the third amplifier, the first output end of the compensation module is connected with the in-phase input end of the second amplifier, and the second output end of the compensation module is connected with the in-phase input end of the second amplifier; and the compensation module is used for determining the reference current related to the thermal voltage, obtaining the equivalent input offset voltage which is equal to the input offset voltage in magnitude and opposite in polarity and related to the thermal voltage according to the reference current and the acquired input offset voltage, and outputting the equivalent input offset voltage to the second amplifier. Therefore, in practical application, the scheme of the invention is adopted, the equivalent input offset voltage related to the thermal voltage is generated through the compensation module, the offset voltage of the operational amplifier is eliminated, and meanwhile, the temperature compensation function is good, so that the static output voltage has high precision in the full-temperature working range.
Based on the above embodiments:
as a preferred embodiment, the compensation module 2 comprises a first resistor R 1 A second resistor R 2 Third resistor R 3 Fourth resistor R 4 Fifth resistor R 5 First transistor M 1 Second transistor M 2 Third transistor M 3 Fourth transistor M 4 Fifth transistor M 5 Sixth transistor M 6 Seventh transistor M 7 Eighth transistor M 8 Ninth transistor M 9 First fuse F 1 Second fuse F 2 Wherein:
first resistor R 1 Respectively with the third resistor R 3 A first end and a fourth resistor R 4 A first resistor R connected to the common terminal of the power supply VCC 1 Respectively with the first transistor M 1 First end of (a) first transistor M 1 Control terminal of the second transistor M 2 A first transistor M connected to the control terminal of 1 And the second end of the third transistor M 3 A first end of a fourth transistor M 4 A control terminal of the third transistor M 3 And the control terminal of the fourth transistor M 4 Is connected to the first terminal of the second transistor M 2 A fourth transistor M connected to the second terminal of 4 And a second resistor R 2 A first terminal of the second transistor M is connected to 2 Respectively with the fifth transistor M 5 A first end of a seventh transistor M 7 Control terminal of eighth transistor M 8 A control terminal of a ninth transistor M 9 A fifth transistor M connected to the control terminal of 5 And a third resistor R 3 A fifth transistor M connected to the second terminal of (C) 5 Respectively and a seventh transistor M 7 Second terminal of (d) and sixth transistor M 6 A sixth transistor M connected to the control terminal of 6 Second end and fourth resistor R 4 A sixth transistor M connected to the second terminal of 6 Respectively with the eighth transistor M 8 A second terminal of (a) and a ninth transistor M 9 The second terminal of the eighth transistor M 8 Respectively with the fifth resistor R 5 Is provided with a first end and a first fuse F 1 A ninth transistor M connected to the first terminal of the compensation module 2 and having a common terminal as the second output terminal 9 Respectively with the fifth resistor R 5 Second end of (2) and second resistor R 2 The first terminal of the wire is connected, the common terminal thereof is used as the first output terminal of the compensation module 2, the third transistor M 3 A second terminal of the seventh transistor M 7 A first end and a second resistor R 2 The second ends of the two are grounded;
the compensation module 2 further comprises a fifth resistor R 5 First fuse F 1 Second fuse F 2 Is connected for adjusting a fifth resistance R 5 To control the fifth resistance R 5 The voltage is equal to the input offset voltage and is also used for controlling the first fuse F 1 Second fuse F 2 A control unit 21 for controlling the equivalent input offset voltage to be opposite in polarity to the input offset voltage;
second resistor R 2 And a third resistor R 3 Fourth resistor R 4 Fifth resistor R 5 Is the same type of (a).
Specifically, the specific structure of the compensation module 2 is shown with reference to fig. 3, and includes a first resistor R 1 A second resistor R 2 Third resistor R 3 Fourth resistor R 4 Fifth resistor R 5 First transistor M 1 Second transistor M 2 Third transistor M 3 Fourth transistor M 4 Fifth transistor M 5 Sixth transistor M 6 Seventh transistor M 7 Eighth transistor M 8 Ninth transistor M 9 First fuse F 1 Second fuse F 2 And a control unit 21, wherein the first transistor M 1 To ninth transistors M 9 Represented by the structure of a triode.
Specifically, the first resistor R 1 A second resistor R 2 First transistor M 1 Second transistor M 2 Third transistor M 3 Fourth transistor M 4 Forming a self-bias circuit to generate a reference current I REF Reference current I REF The calculated relation of (C) is I REF ＝V T ×ln(n)/R 2 ，V T Is the thermal voltage of the Hall signal amplifying circuit, n is the second transistor M 2 And a third transistor M 3 The product of the area of (a) and the first transistor M 1 And a fourth transistor M 4 The ratio of the product of the areas, i.e For the first transistor M 1 Area of->For the second transistor M 2 Area of->Is a third transistor M 3 Area of->For the fourth transistor M 4 And pass through the fifth transistor M 5 Sixth transistor M 6 Third resistor R 3 Fourth resistor R 4 The current I is generated by constructing a proportional current source 1 Assume a fifth transistor M 5 And a sixth transistor M 6 Is equal to the ratio of the areas of the third resistor R 3 And a fourth resistor R 4 Is the ratio of current I 1 The calculated relation of (C) is I 1 ＝I REF ×R 3 /R 4 。
Specifically, the control unit 21 controls the first fuse F by means of trimming 1 Or a second fuse F 2 The polarity and magnitude of the input offset voltage can be calculated and can be used as known quantity, so the control unit 21 can directly obtain the required polarity of the input offset voltage, specifically, if the calculated polarity of the input offset voltage is positive, the polarity of the input offset voltage is negative, the control unit 21 controls the first fuse F 1 If the output voltage is off, OUT+ < OUT-, wherein OUT+ is the voltage of the first output end of the compensation module 2, OUT-is the voltage of the second output end of the compensation module 2, the equivalent input offset voltage output by the compensation module 2 is negative at this time, if the polarity of the calculated input offset voltage is negative, the polarity of the equivalent input offset voltage is positive, and then the control unit 21 controls the second fuse F 2 And if the circuit is disconnected, OUT+ > OUT-, and the polarity of the equivalent input offset voltage output by the compensation module 2 is positive.
After the polarity of the equivalent input offset voltage is adjusted, the magnitude of the equivalent input offset voltage is adjusted according to the magnitude of the calculated input offset voltage, and according to the circuit structure of the embodiment, I is known 1 ＝I REF ×R 3 /R 4 ，I 1 ＝I 2 +I 3 ，I 2 ＝I 3 ＝1/2I 1 ＝1/2I REF ×R 3 /R 4 Therefore, the equivalent input offset voltage relation is | (out+) - (OUT-) |=1/2×v T ×ln(n)×(R 5 /R 2 )×(R 3 /R 4 ) The control unit 21 makes the magnitude of (out+) - (OUT-) | equal to the input offset voltage by adjusting the resistance value of R5, while the second resistor R 2 Third resistor R 3 Fourth resistor R 4 Fifth resistor R 5 The same type of resistor is adopted to offset the influence of the temperature coefficient of the resistor on the temperature coefficient of the static output voltage, so that the temperature coefficient of the equivalent input offset voltage is only related to the thermal voltage, and the control unit 21 adjusts the fifth resistor R in a trimming way 5 The resistance of the operational amplifier is adjusted to adjust the equivalent input offset voltage, so that the input offset voltage of the operational amplifier can be completely offset.
Referring to fig. 4, fig. 4 is a schematic diagram of another hall signal amplification circuit according to the present invention, wherein the hall signal amplification circuit is based on the above embodiments:
as a preferred embodiment, the first amplifier a 1 For the first transconductance amplifier GM 1 Second amplifier A 2 For the second transconductance amplifier GM 2 ；
The hall signal amplification circuit further includes:
first end and first transconductance amplifier GM 1 A sixth resistor R with its second end connected to AC Ground 6 ；
First and second transconductance amplifiers GM 2 A seventh resistor R connected to the inverting output terminal of the capacitor, and connected to the AC Ground at the second terminal 7 。
Specifically, the transconductance amplifier is a differential input amplifierAn amplifier for converting voltage into output current, thus a first transconductance amplifier GM 1 The in-phase output end of (a) outputs a current signal, and a sixth resistor R is connected with the in-phase output end 6 The purpose of this is to divide the first transconductance amplifier GM 1 The current signal output by the in-phase output end of (a) and the second transconductance amplifier GM 2 The sum of the current signals output by the in-phase output end of the (B) is converted into a differential voltage signal and then is connected into a third amplifier A 3 Is the non-inverting input terminal of the second transconductance amplifier GM 2 Similarly, by the second transconductance amplifier GM 2 Is connected in series with a seventh resistor R 7 So as to combine the current signal output from the inverting output terminal of the first transconductance amplifier GM1 with the second transconductance amplifier GM 2 The sum of the current signals output by the inverting output end of the (B) is converted into a differential voltage signal and then is connected into a third amplifier A 3 A sixth resistor R 6 AC Ground, seventh resistor R 7 AC Ground.
As a preferred embodiment, the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 Each includes an eighth resistor R 8 Ninth resistor R 9 Up to thirteenth resistance R 13 Tenth transistor M 10 Eleventh transistor M 11 Up to the twenty-fifth transistor M 25 Wherein:
eighth resistor R 8 Respectively with the tenth resistor R 10 The first end of (a) and the eleventh resistor R 11 A first end and a twelfth resistor R 12 A first terminal connected to the power supply VCC, an eighth resistor R 8 And the second ends of the tenth transistor M 10 A first end of a tenth transistor M 10 Control terminal of (d) and eleventh transistor M 11 A tenth transistor M connected to the control terminal of 10 The second end of (a) is respectively connected with the twelfth transistor M 12 Is connected to the first terminal of the thirteenth transistor M 13 A twelfth transistor M connected to the control terminal of 12 Respectively with the thirteenth transistor M 13 Is connected to the first end of the eleventh transistor M 11 Is connected with the second end of the tenthThree transistors M 13 And a ninth resistor R 9 An eleventh transistor M connected to the first end of 11 Respectively with the fifteenth transistor M 15 Control terminal of fourteenth transistor M 14 A fourteenth transistor M connected to the first end 14 And a tenth resistor R 10 A fourteenth transistor M connected to the second terminal of (C) 14 The control terminal of (a) is respectively connected with the fifteenth transistor M 15 A second terminal of (a) and a sixteenth transistor M 16 A control terminal of seventeenth transistor M 17 Control terminal of (c) and eighteenth transistor M 18 A sixteenth transistor M connected to the control terminal of 16 The second end and the eleventh resistor R 11 A sixteenth transistor M connected to the second terminal of 16 Respectively with the nineteenth transistor M 19 A nineteenth transistor M 19 Control terminal of twentieth transistor M 20 Control terminal of (c) and twenty-first transistor M 21 A seventeenth transistor M connected to the control terminal of 17 The second ends of (a) and the eighteenth transistor M respectively 18 A second end of (d) and a twelfth resistor R 12 A seventeenth transistor M connected to the second terminal of 17 Respectively with the twenty-second transistor M 22 A first end of a twenty-fourth transistor M 24 The eighteenth transistor M is connected to the control terminal of 18 Respectively with the twenty-third transistor M 23 Is a first end of a twenty-fifth transistor M 25 A twenty-second transistor M connected to the control terminal of (A) 22 The second end of (C) is respectively connected with the thirteenth resistor R 13 A first end of a twenty-fourth transistor M 24 Is a first end of a twentieth transistor M 20 A twenty-second transistor M connected to the first end 22 Is used as the control end of the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 A twenty-third transistor M 23 And the twenty-fifth transistor M respectively 25 A first end of a thirteenth resistor R 13 Second terminal of (a) and twenty-first transistor M 21 A thirteenth transistor M connected to the first end 23 Is used as the control end of the first transconductance amplifier GM 1 And a second step ofTransconductance amplifier GM 2 An inverting input terminal of a twenty-fourth transistor M 24 Is used as the second end of the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 An inverting output terminal of the twenty-fifth transistor M 25 Is used as the second end of the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 In-phase output terminal of (a) twelfth transistor M 12 A second end, a ninth resistor R 9 A second terminal of the fifteenth transistor M 15 A nineteenth transistor M 19 A second terminal of the twentieth transistor M 20 Second terminal of (a) and twenty-first transistor M 21 Is grounded.
Specifically, the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 The specific structure of which is shown with reference to FIG. 5, in which the tenth transistor M 10 Through a twenty-fifth transistor M 25 Is represented by the structure of triode, and is represented by a first transconductance amplifier GM 1 For example, an eighth resistor R 8 Ninth resistor R 9 Tenth transistor M 10 Eleventh transistor M 11 Twelfth transistor M 12 Thirteenth transistor M 13 The self-bias circuit generates reference current I REF The second transistor M biases the differential amplifier by a mirror current source 22 Control terminal of (c) and twenty-third transistor M 23 Is used as the control end of the first transconductance amplifier GM 1 A twenty-fourth transistor M 24 And a twenty-fifth transistor M 25 Is a follower for reducing the influence of the input impedance of the rear stage on the front stage signal, wherein the equivalent transconductance relation of the transconductance amplifier is that
As a preferred embodiment, the first transconductance amplifier GM1 and the second transconductance amplifier GM2 each comprise a fourteenth resistor R14, a fifteenth resistor R 15 Sixteenth resistor R 16 Seventeenth resistor R 17 Eighteenth resistor R 18 First, theTwenty-six transistor M 26 Twenty-seventh transistor M 27 Up to forty-first transistor M 41 Wherein:
fourteenth resistor R 14 Respectively with the thirty-th transistor M 30 A second terminal of the thirty-second transistor M 32 A second end of the thirty-third transistor M 33 A second terminal of (d) and a thirty-fourth transistor M 34 A second terminal of the resistor R is connected with the power VCC, a common terminal thereof is connected with the power VCC 14 And the second end of the second transistor M 26 A first end of a twenty-sixth transistor M 26 Is connected to the control terminal of the twenty-seventh transistor M 27 A twenty-sixth transistor M connected to the control terminal of 26 And the twenty eighth transistor M respectively 28 Is a first end of a twenty-ninth transistor M 29 A twenty eighth transistor M connected to the control terminal of 28 The control terminal of (a) is respectively connected with the twenty-ninth transistor M 29 Is connected to the first terminal of the twenty-seventh transistor M 27 A twenty-ninth transistor M connected to the second terminal of 29 The second end and the fifteenth resistor R 15 A twenty-seventh transistor M connected to the first end 27 Respectively with the thirty-th transistor M 30 A thirty-first transistor M 31 A thirty-th transistor M connected to the control terminal of 30 The control terminal of (a) is respectively connected with the thirty-first transistor M 31 A second terminal of the thirty-second transistor M 32 A control terminal of a thirteenth transistor M 33 Control terminal of (d) and thirty-fourth transistor M 34 A thirty-first transistor M connected to the control terminal of 32 Respectively with the thirty-fifth transistor M 35 A thirty-fifth transistor M 35 A control terminal of a thirty-sixth transistor M 36 Is connected to the control terminal of the thirty-seventh transistor M 37 A thirty-fifth transistor M connected to the control terminal of 35 A second end of (1) and a sixteenth resistor R 16 A thirty-sixth transistor M connected to the first end 36 A second terminal of (d) and a thirty-seventh transistor M 37 Is connected to the second terminal of the seventeenth resistor R 17 A third thirteenth transistor M connected to the first end 33 Respectively with the eighteenth resistor R 18 A forty-first transistor M 40 Second terminal of (d) and thirty-eighth transistor M 38 A forty-first transistor M connected to 40 Respectively with the thirty-eighth transistor M 38 Is connected to the control terminal of the thirty-sixth transistor M 36 A thirty-fourth transistor M connected to the first end 34 Respectively with the eighteenth resistor R 18 A fourth transistor M 41 A second terminal of (d) and a thirty-ninth transistor M 39 A forty-first transistor M connected to the first end 41 Respectively with the thirty-ninth transistor M 39 Is connected to the control terminal of the thirty-seventh transistor M 37 A forty-first transistor M connected to 40 Is used as the control end of the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 A forty-first transistor M 41 Is used as the control end of the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 Is the thirty-eighth transistor M 38 Is used as the second end of the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 The thirty-ninth transistor M 39 Is used as the second end of the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 In-phase output terminal of (a) twenty-eighth transistor M 28 A second end of (a) fifteenth resistor R 15 A thirty-first transistor M 31 A first end of (1), a sixteenth resistor R 16 A second end of (seventeenth) resistor R 17 Is grounded.
Specifically, the first transconductance amplifier GM 1 And a second transconductance amplifier GM 2 The structure shown in fig. 6 may also be employed to realize its function.
As a preferred embodiment, the hall signal-amplifying circuit further includes a nineteenth resistor R 19 Twentieth resistor R 20 Twenty-first resistor R 21 Twenty-second resistor R 22 Wherein:
nineteenth resistor R 19 Is arranged at the first end and the first positionAmplifier A 1 Is connected with the in-phase output end of the nineteenth resistor R 19 Respectively with the second end of the third amplifier A 3 Is connected to the non-inverting input terminal of (C) and the twenty-first resistor R 21 Is connected with the first end of the twentieth resistor R 20 Is connected with the first end of the first amplifier A 1 Is connected with the inverting output terminal of the twentieth resistor R 20 Respectively with the second end of the third amplifier A 3 Is connected to the inverting input terminal of the second resistor R 22 A twenty-second resistor R connected to the first end of 22 And a third amplifier A 3 Is connected with the output end of the power supply.
Specifically, referring to fig. 7, a nineteenth resistor R 19 Twentieth resistor R 20 Twenty-first resistor R 21 Twenty-second resistor R 22 And a third amplifier A 3 Form a differential proportional operational amplifier structure, a nineteenth resistor R 19 And a twentieth resistor R 20 The same, twenty-first resistor R 21 And a twenty-second resistor R 22 The same is true of the third amplifier A 3 Gain value A 1 Corresponding A 1 ＝-R 21 /R 19 。
As a preferred embodiment, the first transistor M 1 Second transistor M 2 Up to the twenty-fifth transistor M 25 Are all triodes.
As a preferred embodiment, a twenty-sixth transistor M 26 Twenty-seventh transistor M 27 Up to forty-first transistor M 41 Are all triodes.
Specifically, the triode has lower cost, and the Hall signal amplifying circuit provided by the invention is formed by adopting the triode, so that the advantages of the Hall signal amplifying circuit can be ensured, and meanwhile, the cost is saved.
Of course, the transistors may be transistors, or CMOS transistors or other transistors may be selected according to actual engineering requirements, so long as the above functions can be implemented.
In the schematic structural diagrams shown in fig. 3, 5 and 6, the first transistor M 1 Second transistor M 2 Third transistor M 3 Fourth transistor M 4 Tenth transistor M 10 Eleventh transistor M 11 Twelfth transistor M 12 Thirteenth transistor M 13 Nineteenth transistor M 19 Twentieth transistor M 20 Twenty-first transistor M 21 Twenty-second transistor M 22 Twenty-third transistor M 23 Twenty-sixth transistor M 26 Twenty-seventh transistor M 27 Twenty eighth transistor M 28 Twenty-ninth transistor M 29 Thirty-fifth transistor M 35 Thirty-sixth transistor M 36 Thirty-seventh transistor M 37 Thirty-eighth transistor M 38 Thirty-ninth transistor M 39 All are NPN type triode and all other transistors are PNP type transistor.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
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 (7)
1. The Hall signal amplifying circuit is characterized by comprising a Hall sensor module, a first amplifier, a second amplifier, a third amplifier and a compensation module, wherein the Hall sensor module is connected with a power supply, the second amplifier and the third amplifier are identical in structure with the first amplifier, and the compensation module is arranged in the Hall sensor module, and the first amplifier is connected with the power supply through the second amplifier and the third amplifier, and the compensation module is connected with the Hall sensor module through the first amplifier.
The first output end of the Hall sensor module is connected with the non-inverting input end of the first amplifier, the second output end of the Hall sensor module 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, the first output end of the compensation module is connected with the non-inverting input end of the second amplifier, and the second output end of the compensation module is connected with the inverting input end of the second amplifier;
the compensation module is used for determining a reference current related to the thermal voltage, obtaining an equivalent input offset voltage which is equal to the input offset voltage in size and opposite in polarity and related to the thermal voltage according to the reference current and the acquired input offset voltage, and outputting the equivalent input offset voltage to the second amplifier;
The compensation module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, a first fuse, a second fuse, wherein:
the first end of the first resistor is connected with the first end of the third resistor and the first end of the fourth resistor respectively, the common end of the first resistor is connected with the power supply, the second end of the first resistor is connected with the first end of the first transistor, the control end of the first transistor and the control end of the second transistor respectively, the second end of the first transistor is connected with the first end of the third transistor and the control end of the fourth transistor respectively, the control end of the third transistor is connected with the first end of the fourth transistor and the second end of the second transistor respectively, the second end of the fourth transistor is connected with the first end of the second resistor, the first end of the second transistor is connected with the first end of the fifth transistor, the control end of the seventh transistor, the control end of the eighth transistor and the control end of the ninth transistor respectively, the second end of the fifth transistor is connected with the second end of the third resistor, the control end of the fifth transistor is respectively connected with the second end of the seventh transistor and the control end of the sixth transistor, the second end of the sixth transistor is connected with the second end of the fourth resistor, the first end of the sixth transistor is respectively connected with the second end of the eighth transistor and the second end of the ninth transistor, the first end of the eighth transistor is respectively connected with the first end of the fifth resistor and the first end of the first fuse, the common end of the eighth transistor is used as the second output end of the compensation module, the first end of the ninth transistor is respectively connected with the second end of the fifth resistor and the first end of the second fuse, the common end of the ninth transistor is used as the first output end of the compensation module, the second end of the third transistor, the first end of the seventh transistor and the second end of the second resistor are all grounded;
The compensation module further comprises a control unit which is respectively connected with the fifth resistor, the first fuse wire and the second fuse wire, is used for adjusting the resistance value of the fifth resistor to control the voltage on the fifth resistor to be equal to the input offset voltage, and is also used for controlling the fusing of the first fuse wire and the second fuse wire to control the equivalent input offset voltage to be opposite to the input offset voltage in polarity; the control unit controls the fusing of the first fuse wire or the second fuse wire in a trimming mode;
the second resistor is the same as the third resistor, the fourth resistor and the fifth resistor.
2. The hall signal amplification circuit of claim 1, wherein the first amplifier is a first transconductance amplifier and the second amplifier is a second transconductance amplifier;
the hall signal amplification circuit further includes:
a sixth resistor with a first end connected with the in-phase output end of the first transconductance amplifier and a second end connected with AC ground;
and a seventh resistor with a first end connected with the inverting output end of the second transconductance amplifier and a second end connected with alternating current ground.
3. The hall signal amplification circuit of claim 2, wherein the first transconductance amplifier and the second transconductance amplifier each comprise an eighth resistor, a ninth resistor up to a thirteenth resistor, a tenth transistor, an eleventh transistor up to a twenty-fifth transistor, and wherein:
the first end of the eighth resistor is connected with the first end of the tenth resistor, the first end of the eleventh resistor and the first end of the twelfth resistor respectively, the common end of the eighth resistor is connected with the power supply, the second end of the eighth resistor is connected with the first end of the tenth transistor, the control end of the tenth transistor and the control end of the eleventh transistor respectively, the second end of the tenth transistor is connected with the first end of the twelfth transistor and the control end of the thirteenth transistor respectively, the control end of the twelfth transistor is connected with the first end of the thirteenth transistor and the second end of the eleventh transistor respectively, the second end of the thirteenth transistor is connected with the first end of the ninth resistor, the first end of the eleventh transistor is connected with the control end of the fifteenth transistor and the first end of the fourteenth transistor respectively, the second end of the fourteenth transistor is connected with the second end of the tenth resistor, the control end of the fourteenth transistor is connected with the second end of the fifteenth transistor, the control end of the sixteenth transistor and the control end of the eighteenth transistor, the second end of the sixteenth transistor is connected with the second end of the eleventh resistor, the first end of the sixteenth transistor is connected with the first end of the nineteenth transistor, the control end of the twentieth transistor and the control end of the twenty first transistor, the second end of the seventeenth transistor is connected with the second end of the eighteenth transistor and the second end of the twelfth resistor, the first end of the seventeenth transistor is connected with the first end of the twenty fourth transistor, the first end of the eighteenth transistor is connected with the first end of the twenty-third transistor and the control end of the twenty-fifth transistor respectively, the second end of the twenty-third transistor is connected with the first end of the thirteenth resistor, the first end of the twenty-fourth transistor and the first end of the twenty-fourth transistor respectively, the control end of the twenty-fourth transistor is used as the non-inverting input end of the first transconductance amplifier and the second transconductance amplifier, the second end of the twenty-fifth transistor is connected with the first end of the twenty-fifth transistor, the second end of the thirteenth resistor and the first end of the twenty-first transistor respectively, the control end of the twenty-fourth transistor is used as the inverting input end of the first transconductance amplifier and the second transconductance amplifier, the second end of the twenty-fifth transistor is used as the non-inverting output end of the first transconductance amplifier and the second transconductance amplifier, and the second end of the twenty-fifth transistor is used as the non-inverting input end of the first transconductance amplifier and the twenty-fifth transistor.
4. The hall signal amplification circuit of claim 2, wherein the first transconductance amplifier and the second transconductance amplifier each comprise a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a twenty-sixth transistor, a twenty-seventh transistor through a forty-first transistor, wherein:
the first end of the fourteenth resistor is connected with the second end of the thirty-eighth transistor, the second end of the thirty-third transistor and the second end of the thirty-fourth transistor respectively, the common end of the thirty-eighth transistor is connected with the power supply, the second end of the fourteenth resistor is connected with the first end of the twenty-sixth transistor, the control end of the thirty-sixth transistor and the control end of the thirty-seventh transistor respectively, the second end of the twenty-sixth transistor is connected with the first end of the thirty-eighth transistor and the control end of the thirty-eighth transistor respectively, the control end of the twenty-eighth transistor is connected with the first end of the twenty-ninth transistor and the second end of the twenty-seventh transistor respectively, the second end of the twenty-seventh transistor is connected with the first end of the thirty-seventh resistor, the control end of the thirty-seventh transistor, the thirty-first end of the thirty-third transistor is connected with the control end of the thirty-fifth transistor, the thirty-fifth transistor and the thirty-fifth end of the thirty-seventh transistor respectively, the thirty-first end of the thirty-seventh transistor is connected with the control end of the thirty-third transistor and the thirty-fifth end of the thirty-seventh transistor respectively, the thirty-seventh end of the thirty-seventh transistor and the thirty-seventh end of the thirty-seventh transistor is connected with the first end of the thirty-seventh transistor respectively, the control end of the thirty-seventh transistor and the thirty-seventh transistor is connected with the first end of the thirty-seventh transistor and the thirty-eighth end of the thirty transistor respectively, the first end of the thirty-fourth transistor is respectively connected with the first end of the eighteenth resistor, the second end of the fortieth transistor and the first end of the thirty-eighth transistor, the first end of the fortieth transistor is respectively connected with the control end of the thirty-eighth transistor and the first end of the thirty-sixth transistor, the first end of the thirty-fourth transistor is respectively connected with the second end of the eighteenth resistor, the second end of the fortieth first transistor and the first end of the thirty-ninth transistor, the first end of the fortieth first transistor is respectively connected with the control end of the thirty-ninth transistor and the first end of the thirty-seventh transistor, the control end of the fortieth transistor is used as the in-phase input end of the first transconductance amplifier and the second transconductance amplifier, the control end of the fortieth transistor is used as the out-phase input end of the first transconductance amplifier and the second transconductance amplifier, the second end of the thirty-eighth transistor is used as the in-phase input end of the first transconductance amplifier and the second transconductance amplifier, the fortieth end of the thirty-eighth transistor is used as the in-phase input end of the first transconductance amplifier and the second transconductance amplifier, and the fortieth end of the thirty-eighth amplifier.
5. The hall signal amplification circuit of claim 1, further comprising a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, wherein:
the first end of the nineteenth resistor is connected with the in-phase output end of the first amplifier, the second end of the nineteenth resistor is respectively connected with the in-phase input end of the third amplifier and the first end of the twenty first resistor, the first end of the twentieth resistor is connected with the inverting output end of the first amplifier, the second end of the twentieth resistor is respectively connected with the inverting input end of the third amplifier and the first end of the twenty second resistor, and the second end of the twenty second resistor is connected with the output end of the third amplifier.
6. The hall signal amplification circuit of claim 3, wherein the first transistor, the second transistor, and up to the twenty-fifth transistor are transistors.
7. The hall signal amplification circuit of claim 4, wherein the twenty-sixth transistor, the twenty-seventh transistor through the forty-first transistor are transistors.
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| CN109830215B (en) * | 2019-02-20 | 2021-01-26 | 京东方科技集团股份有限公司 | Gamma correction circuit, gamma correction method, source electrode driving circuit and display panel |
| CN111026220B (en) * | 2019-12-12 | 2021-06-04 | 南京邮电大学 | Temperature stability control system of CMOS Hall sensor |
| CN111474456B (en) * | 2020-04-14 | 2021-03-05 | 新磊半导体科技（苏州）有限公司 | Hall effect voltage determining method and Hall test system |
| 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 |
| CN114285385B (en) * | 2022-02-21 | 2022-06-03 | 成都芯翼科技有限公司 | Offset circuit of operational amplifier input current |
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