CN107885268A - Negative feedback current source circuit and electronic equipment - Google Patents
Negative feedback current source circuit and electronic equipment Download PDFInfo
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- CN107885268A CN107885268A CN201610873627.7A CN201610873627A CN107885268A CN 107885268 A CN107885268 A CN 107885268A CN 201610873627 A CN201610873627 A CN 201610873627A CN 107885268 A CN107885268 A CN 107885268A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The present invention relates to electronic technology field, discloses a kind of negative feedback current source circuit and electronic equipment.In embodiment of the present invention, first order negative feedback current source circuit, the first constant current for flowing through 3rd resistor is produced, and reference voltage is provided for second level negative feedback current source circuit；Second level negative feedback current source circuit, the reference voltage provided according to first order negative feedback current source circuit, the second constant current for flowing through the second load is produced, wherein, 3rd resistor connection pull-up voltage source, the second carrying ground.Embodiment of the present invention, while realizing the output of the second constant current using first order negative feedback current source circuit, the second carrying ground function is realized, so as to applied to the application scenarios for requiring carrying ground.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of negative feedback current source circuit and electronic equipment.
Background technology
At present, conventional current source circuit includes the circuit of image current source structure with using operational amplifier negative-feedback electricity
Flow the circuit of source structure, the structural representation of the circuit of image current source structure, as shown in figure 1, two bipolar transistor BJT
(bipolarjunction transistor) is characteristically just the same, i.e. IB1=IB2、β1=β2=β, ICEO1=ICEO2, its
In, IBRepresent base current, β and ICEOIt is the characterisitic parameter of BJT pipes, β is DC current amplification factor, ICEOIt is that base stage is opened
Reverse penetration current during road between collector-emitter-base bandgap grading, because two triode Q1 and Q2 have identical base-emitter voltage VBE,
Therefore, it was found from circuit first principles analysis, IC1=IC2=IO, wherein, ICRepresent collector current, IOElectric current caused by expression
Source, from Kirchhoff's current law (KCL), IRL=IC1+2*IB=IC1* (1+2/ β), then IO=IRL/ (1+2/ β), wherein, IRLTable
Show the electric current for flowing through load RL, if β ＞ ＞ 2, and VCC＞ ＞ VBE, then the value I of current sourceO≈VCC/ RL, wherein, VCCRepresent electricity
Source voltage.
Using the structural representation of the circuit of operational amplifier negative feedback current source structure, as shown in Figure 2.Put using computing
Big device adds the structure of triode, and the positive input terminal of operational amplifier inputs a reference voltage VREF, and operational amplifier is used and closed
Ring negative-feedback, VA=VREF is understood with empty short theory, flows into resistance R2 electric current Io=VA/ R2=VREF/R2, in VCC-
Electric current on RL1-Q1-R2-GND branch roads with regard to it is constant be Io, wherein, negative-feedback flow is as follows：If electric current Io becomes big, A points electricity
VA rises are pressed, flow through the net voltage of opamp input terminal (i.e.：VREF-VA) reduce, then, operational amplifier output terminal is defeated
The voltage gone out can also reduce, and cause triode Q1 base current to reduce, and flow through VCCThe electric current Io of-RL1-Q1-R2-GND branch roads
Also can reduce, it is achieved thereby that output current Io is stable.
However, during invention is realized, inventors herein have recognized that, for the circuit of image current source structure,
Load RL must be pulled upward to a power supply VCC, current stability, is by power supply VCCInfluence of fluctuations is larger, moreover, this kind of structure is to two
The symmetry requirement of individual triode is very high, and actual process is realized complicated.For using operational amplifier negative feedback current source structure
Circuit, power supply V must be pulled upward to by loading RL1 one endCC, can not be applied to require the scene for loading RL1 ground connection.
The content of the invention
The purpose of embodiment of the present invention is to provide a kind of negative feedback current source circuit and electronic equipment, utilizes the first order
While negative feedback current source circuit realizes the output of the second constant current, the second carrying ground function is realized, so as to be applied to want
Seek the application scenarios of carrying ground.
In order to solve the above technical problems, embodiments of the present invention provide a kind of negative feedback current source circuit, including：The
One-level negative feedback current source circuit and second level negative feedback current source circuit；
The first order negative feedback current source circuit, the first constant current of 3rd resistor is flowed through for producing, and be institute
State second level negative feedback current source circuit and reference voltage is provided；Wherein, the 3rd resistor connection pull-up voltage source；
The second level negative feedback current source circuit, for the base provided according to the first order negative feedback current source circuit
Quasi- voltage, produce the second constant current for flowing through the second load；Wherein, second carrying ground.
Embodiments of the present invention additionally provide a kind of electronic equipment, including：Above-mentioned negative feedback current source circuit.
In terms of existing technologies, first order negative feedback current source circuit, generation flows through the 3rd to embodiment of the present invention
First constant current of resistance, by caused first constant current, generate the terminal voltage of 3rd resistor, and by the 3rd electricity
The terminal voltage of resistance is as reference voltage, there is provided give second level negative-feedback circuit, so as to second level negative feedback current source circuit string
Connection, second level negative feedback current source circuit, the reference voltage provided according to first order negative feedback current source circuit, generate and flow through
Second constant current of the second load of ground connection so that second level negative feedback current source circuit, it is constant that second can not only be produced
Electric current and the second carrying ground function is realized, so that the negative feedback current source circuit, can apply to require that load connects
The application scenarios on ground.
In addition, the first order negative feedback current source circuit specifically includes：Triode Q1, the first operational amplifier OP1,
One resistance R1, second resistance R2, the loads of 3rd resistor R3 and first RL1；The positive input termination of the first operational amplifier OP1
Reference voltage input VREF, negative input end are grounded after the second resistance R2, the output of the first operational amplifier OP1
End is connected to the base stage of the triode Q1 after the first resistor R1；The colelctor electrode of the triode Q1 is first through described first
RL1 is loaded, then after the 3rd resistor R3, connects the pull-up voltage source, emitter stage is grounded after the second resistance R2.
Using the first order negative feedback current source circuit of said structure, the first constant current can not only be produced, and make
Obtain first order negative feedback current source circuit in actual applications, also can be the second level negative feedback current when being connected to specific load
Source circuit provides constant reference voltage.
In addition, the triode Q1 is NPN type triode.
By NPN type triode Q1, while negative feedback current source circuit function is ensured, select to close according to circuit structure
Suitable triode so that the structure of whole circuit is relatively easy.
In addition, the second level negative feedback current source circuit includes：Compound transistor Q2, the second operational amplifier OP2,
Four resistance R4, the 5th resistance R5 and the second load RL2；The positive input terminal of the second operational amplifier OP2 is connected to described
One-level negative feedback current source circuit, negative input end are connected to the emitter stage of the compound transistor Q2, second operation amplifier
Device OP2 output end is connected to the base stage of the compound transistor Q2 through the 4th resistance R4；The compound transistor Q2's
Colelctor electrode is grounded after the described second load RL2, and emitter stage is followed by upper pull-up voltage through the 5th resistance R5.
Using above-mentioned second level negative feedback current source circuit, the second constant current can not only be produced, and realizes
Two carrying ground functions, so as to applied to more scenes.
Brief description of the drawings
Fig. 1 is a kind of electrical block diagram of image current source structure of the prior art；
Fig. 2 is the electrical block diagram of operational amplifier negative feedback current source structure of the prior art；
Fig. 3 is the structural representation according to a kind of negative feedback current source circuit of first embodiment of the invention；
Fig. 4 is the structural representation according to a kind of negative feedback current source circuit of second embodiment of the invention；
Fig. 5 is the structural representation according to a kind of electronic equipment of third embodiment of the invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, each reality below in conjunction with accompanying drawing to the present invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention,
In order that reader more fully understands the application and proposes many ins and outs.But even if without these ins and outs and base
Many variations and modification in following embodiment, the application technical scheme claimed can also be realized.
The first embodiment of the present invention is related to a kind of negative feedback current source circuit.Concrete structure schematic diagram, such as Fig. 3 institutes
Show.
First order negative feedback current source circuit 10, the first constant current of 3rd resistor is flowed through for producing, and be second
Level negative feedback current source circuit provides reference voltage, wherein, 3rd resistor connection pull-up voltage source Vcc.
Specifically, first order negative feedback current source circuit includes：NPN type triode Q1, the first operational amplifier OP1,
First resistor R1, second resistance R2 and 3rd resistor R3, wherein, the first operational amplifier OP1 positive input termination reference voltage
Input VREF, negative input end are grounded after second resistance R2, and the first operational amplifier OP1 output end is after first resistor R1
Triode Q1 base stage is connected to, triode Q1 colelctor electrode is after 3rd resistor R3, connection pull-up voltage source Vcc, emitter stage
It is grounded after second resistance R2, wherein, above-mentioned Q1 can also be N-type metal-oxide semiconductor (MOS) in addition to being NPN type triode
NMOS (Negative channel-Metal-Oxide-Semiconductor) transistor.Further, second level negative-feedback
Current source circuit, the 3rd resistor R3 of first order negative feedback current source circuit is connected to, between triode Q1 colelctor electrode
Node B1.
It should be noted that in above-mentioned first order negative feedback current source circuit, voltage vcc -3rd resistor R3- tri- is pulled up
Pole pipe Q1- second resistances R2 electric current, as the first constant current, is denoted as Io1, wherein, Io1=VREF/R2, due to branch road electricity
Flow Io1It is constant, therefore the pressure drop flowed through after 3rd resistor R3 is constant, that is to say, that first order negative feedback current source circuit
The voltage of first node B1 between 3rd resistor R3, and triode Q1 colelctor electrode is constant.
Second level negative feedback current source circuit 11, for the benchmark electricity provided according to first order negative feedback current source circuit
Pressure, the second constant current for flowing through the second load is produced, wherein, the second carrying ground.
Specifically, negative feedback current source circuit in the second level includes：The compound transistor Q2 of two positive-negative-positives, the second computing
Amplifier OP2, the 4th resistance R4, the load RL2 of the 5th resistance R5 and second, wherein, the second operational amplifier OP2 positive input terminal
The 3rd resistor R3 of first order negative feedback current source circuit is connected to, the first node B1 between triode Q1 colelctor electrode,
Negative input end is connected to compound transistor Q2 emitter stage, and the second operational amplifier OP2 output end is through the 4th resistance R4 connections
To compound transistor Q2 base stage, compound transistor Q2 colelctor electrode is grounded after the second load RL2, and emitter stage is through the 5th resistance
R5 is followed by pulling up voltage source Vcc, wherein, Q2 can also be pliotron in addition to it can be compound transistor, or field is imitated
Ying Guan, specifically using which kind of device, according in actual circuit, the output current ability of operational amplifier and the output work of current source
Depending on rate is specific, the second load RL2 resistance is can to become with the increase of usage time or the change of other external conditions
Change.
It should be noted that the second operational amplifier OP2 of second level negative feedback current source circuit positive input terminal, connection
To the first node B1 of first order negative feedback current source circuit, based on amplifier use principle, second level negative feedback current source circuit
Node C voltage Vc equal to first node B1 voltage Vb1, then the 5th resistance R5 and 3rd resistor R3 terminal voltage phase
Deng, and because pull-up voltage vcc -3rd resistor R3- triode Q1- second resistances R2 electric current it is constant be Io1, then 3rd resistor
The pressure drop U=I at R3 both endso1* R3=VREF*R3/R2, therefore, the electric current I of the 5th resistance is flowed througho2=U/R5=(VREF*R3)/
(R2*R5), after the negative-feedback balance of second level negative feedback current source circuit, pull-up voltage source Vcc-the five resistance R5- is compound
Triode Q2- second load RL2- GND branch roads electric current with regard to it is constant be Io2, that is, obtain the second constant current Io2, work as Io2Occur
During change, second level negative feedback current source circuit can make electric current output stable；Such a circuit structure realizes the second load RL2 mono-
End ground connection, without requiring load connection pull-up voltage source Vcc again.
Especially, the circuit structure according to Fig. 3, understood by simple computation, first order negative feedback current source circuit
The first constant current Io1, the second constant current I with second level negative feedback current source circuito2, meet certain proportion, be denoted as
η, wherein, η=Io2/Io1=R3/R5, that is, the electric current for flowing through the loads of 3rd resistor R3 and second RL2 is a fixed proportion, should
Ratio is only relevant with the 5th resistance R5 with 3rd resistor R3, it is achieved thereby that the ratio association of two electric currents.As 3rd resistor R3
For a precision potentiator when, aforementioned proportion η can arbitrarily be set, if necessary to by second load current settings at some
In value, reference voltage V REF value can be adjusted using number block converter, realizes any setting of the first constant current, from
And realize any setting of the second constant current.
Compared with prior art, in the present embodiment, first order negative feedback current source circuit passes through NPN type triode
Q1, the first operational amplifier OP1, first resistor R1, the second resistance R2 of ground connection and connection pull up the 3rd resistor R3 of voltage source
Annexation, produce and flow through the first constant current of 3rd resistor, and generate the terminal voltage of 3rd resistor, so as to be second
Level negative-feedback circuit provides reference voltage, and second level negative feedback current source circuit is connected with first order negative feedback current source circuit,
By compound transistor Q2, the second operational amplifier OP2, the 4th resistance R4, connection pull-up voltage source Vcc the 5th resistance R5 and
Second load RL2 of ground connection annexation, not only creates the second constant current for flowing through the second load, it is negative to realize second
Grounding function is carried, and causes the first constant current and the second constant current to meet certain proportion, while ratio and the 3rd
Resistance is relevant with the 5th resistance, brings flexible and changeable application.
Second embodiment of the present invention is related to a kind of negative feedback current source circuit.Second embodiment is implemented first
Further improvement on the basis of mode, is mainly theed improvement is that：In second embodiment of the invention, in first order negative-feedback
The first load RL1 is added in current source circuit 10, this causes first order negative feedback current source circuit in actual applications, when even
When being connected to the variable specific load of resistance, second level negative feedback current source circuit can be also set to produce constant current, concrete structure shows
It is intended to, as shown in Figure 4.
First order negative feedback current source circuit 10, the first constant current of the first load is flowed through for producing, and be second
Level negative feedback current source circuit provides reference voltage, wherein, the first load is after 3rd resistor, connection pull-up voltage vcc.
Specifically, first order negative feedback current source circuit includes：NPN type triode Q1, the first operational amplifier OP1,
First resistor R1, second resistance R2, the loads of 3rd resistor R3 and first RL1, the first operational amplifier OP1 positive input termination base
Quasi- voltage input end VREF, negative input end are grounded after second resistance R2, and the first operational amplifier OP1 output end is through the first electricity
Triode Q1 base stage is connected to after resistance R1, triode Q1 colelctor electrode first loads RL1 through first, then after 3rd resistor R3,
Pull-up voltage in connection, emitter stage are grounded after second resistance R2, wherein, first load RL1 resistance be can with use when
Between increase or other external conditions change and change.Further, second level negative feedback current source circuit, it is connected to
Section point B2 between first load RL1, with 3rd resistor R3 of one-level negative feedback current source circuit, so, even if voltage
Be superimposed with interference signal on the Vcc of source, first order current source flow through 3rd resistor R3 caused by terminal voltage be also it is forever constant, from
And the voltage constant being added on the 5th resistance R5 is ensure that, and then improve the PSRR of whole circuit.
Further, the second operational amplifier OP2 of second level negative feedback current source circuit 11 positive input terminal, connection
To the section point B2 of first order negative feedback current source circuit, based on amplifier use principle, second level negative feedback current source circuit
Node C voltage Vc equal to section point B2 voltage Vb2, then the 5th resistance R5 and 3rd resistor R3 terminal voltage phase
Deng, and because Vcc- 3rd resistors R3- first load RL1- triode Q1- second resistances R2 electric current it is constant be Io1, then the 3rd
The pressure drop U=I at resistance R3 both endso1* R3=VREF*R3/R2, therefore, the electric current I of the 5th resistance is flowed througho2=U/R5=(VREF*
R3)/(R2*R5), after the negative-feedback balance of second level negative feedback current source circuit, the resistance R5- of voltage source Vcc-the five is pulled up
Compound transistor Q2- second load RL2- GND branch roads electric current with regard to it is constant be Io2, that is, obtain the second constant current Io2, work as Io2
When changing, second level negative feedback current source circuit can make electric current output stable, and second load RL2 one end ground connection,
Pull-up voltage source Vcc need not be reconnected.
Especially, the circuit structure according to Fig. 4, understood by simple computation, first order negative feedback current source circuit
The first constant current Io1, the second constant current I with second level negative feedback current source circuito2, meet certain proportion, be denoted as
η, wherein, η=Io2/Io1=R3/R5, that is, the electric current for flowing through 3rd resistor and the second load is a fixed proportion, and the ratio is only
It is relevant with the 5th resistance R5 with 3rd resistor R3, it is achieved thereby that the ratio association of two electric currents.When 3rd resistor is an essence
During close potentiometer, aforementioned proportion η can arbitrarily be set, can if desired by the current settings of the second load in some value
To adjust reference voltage V REF value using number block converter, any setting of the first constant current is realized, so as to realize
Any setting of second constant current.
Present embodiment, it is first order negative feedback current source circuit, the load of increase by first RL1 so that first order negative-feedback
Current source circuit in actual applications, when being connected in specific load, can also cause second level negative feedback current source circuit to be based on
3rd resistor R3 terminal voltage, the second stable constant current is produced, and second constant current is not because the first load itself is special
The change of property and change.
Third embodiment of the invention is related to a kind of electronic equipment, as shown in figure 5, including：Above-mentioned negative feedback current source electricity
Road 511.
Negative feedback current source circuit 511, in the case of carrying ground, producing constant current.
Present embodiment, negative feedback current source circuit is applied in actual electronic equipment, realizes negative feedback current
The practical application of source circuit.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention,
And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (9)
- A kind of 1. negative feedback current source circuit, it is characterised in that including：First order negative feedback current source circuit is negative anti-with the second level Feed current source circuit；The first order negative feedback current source circuit, the first constant current of 3rd resistor is flowed through for producing, and be described the Two level negative feedback current source circuit provides reference voltage；Wherein, the 3rd resistor connection pull-up voltage source；The second level negative feedback current source circuit, for the benchmark electricity provided according to the first order negative feedback current source circuit Pressure, produce the second constant current for flowing through the second load；Wherein, second carrying ground.
- 2. negative feedback current source circuit according to claim 1, it is characterised in that the first order negative feedback current source electricity Road includes：Triode Q1, the first operational amplifier OP1, first resistor R1, second resistance R2 and 3rd resistor R3；The positive input termination reference voltage input VREF of the first operational amplifier OP1, negative input end is through the described second electricity It is grounded after resistance R2, the output end of the first operational amplifier OP1 is connected to the triode Q1 after the first resistor R1 Base stage；The colelctor electrode of the triode Q1 connects the pull-up voltage source after the 3rd resistor R3, described in emitter stage warp It is grounded after second resistance R2.
- 3. negative feedback current source circuit according to claim 1, it is characterised in that the first order negative feedback current source electricity Road specifically includes：Triode Q1, the first operational amplifier OP1, first resistor R1, second resistance R2,3rd resistor R3 and first Load RL1；The positive input termination reference voltage input VREF of the first operational amplifier OP1, negative input end is through the described second electricity It is grounded after resistance R2, the output end of the first operational amplifier OP1 is connected to the triode Q1 after the first resistor R1 Base stage；The colelctor electrode of the triode Q1 is first through the described first load RL1, then after the 3rd resistor R3, described in connection Voltage source is pulled up, emitter stage is grounded after the second resistance R2.
- 4. the negative feedback current source circuit according to Claims 2 or 3, it is characterised in that the triode Q1 is NPN type three Pole pipe.
- 5. the negative feedback current source circuit according to Claims 2 or 3, it is characterised in that the second level negative feedback current Source circuit includes：Compound transistor Q2, the second operational amplifier OP2, the 4th resistance R4, the loads of the 5th resistance R5 and second RL2；The positive input terminal of the second operational amplifier OP2 is connected to the first order negative feedback current source circuit, negative input end The emitter stage of the compound transistor Q2 is connected to, the output end of the second operational amplifier OP2 is through the 4th resistance R4 It is connected to the base stage of the compound transistor Q2；The colelctor electrode of the compound transistor Q2 is grounded after the described second load RL2, Emitter stage is followed by pulling up voltage source through the 5th resistance R5.
- 6. negative feedback current source circuit according to claim 5, it is characterised in that the second operational amplifier OP2's Positive input terminal, it is connected to the first node B1 of the first order negative feedback current source circuit, or section point B2；Wherein, nodes of the first node B1 between the 3rd resistor R3, and the colelctor electrode of the triode Q1；It is described Nodes of the section point B2 between the first load resistance RL1, with the 3rd resistor R3.
- 7. negative feedback current source circuit according to claim 5, it is characterised in that the compound transistor Q2 is to include two The compound transistor of individual PNP type triode.
- 8. negative feedback current source circuit according to claim 6, it is characterised in that second constant current and described the The ratio of one constant current, equal to the described first load RL1 and the 5th resistance R5 ratio, or equal to the described 3rd electricity Hinder R3 and the 5th resistance R5 ratio.
- 9. a kind of electronic equipment, it is characterised in that including the negative feedback current source circuit described in any one of claim 1 to 8.
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| CN110262617A (en) * | 2019-07-22 | 2019-09-20 | 宁波市芯能微电子科技有限公司 | LD0 pre-compensation circuit |
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| CN113282130A (en) * | 2021-06-08 | 2021-08-20 | 西安中颖电子有限公司 | High-precision LED constant current driving circuit |
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| CN109976429A (en) * | 2019-04-19 | 2019-07-05 | 宁波大学 | Regulated power supply in a kind of current feedback zero-temperature coefficient piece |
| CN109976429B (en) * | 2019-04-19 | 2020-09-08 | 宁波大学 | Current feedback type zero-temperature-coefficient on-chip voltage-stabilized power supply |
| CN110262617A (en) * | 2019-07-22 | 2019-09-20 | 宁波市芯能微电子科技有限公司 | LD0 pre-compensation circuit |
| CN110262617B (en) * | 2019-07-22 | 2020-10-27 | 宁波市芯能微电子科技有限公司 | LDO (low dropout regulator) pre-compensation circuit |
| WO2022245233A1 (en) * | 2021-05-17 | 2022-11-24 | Закрытое Акционерное Общество "Драйв" | Controller for an electronically controlled resistor |
| CN113219316A (en) * | 2021-05-18 | 2021-08-06 | 北京轩宇空间科技有限公司 | Triode amplification factor test circuit based on negative feedback |
| CN113219316B (en) * | 2021-05-18 | 2022-10-14 | 北京轩宇空间科技有限公司 | Triode amplification factor test circuit based on negative feedback |
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Application publication date: 20180406 Assignee: Shanghai Li Ke Semiconductor Technology Co., Ltd. Assignor: Leadcore Technology Co., Ltd. Contract record no.: 2018990000159 Denomination of invention: Negative feedback current source circuit and electronic equipment License type: Common License Record date: 20180615 |
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