CN109375699A - Voltage-current converter circuit with high linearity - Google Patents
Voltage-current converter circuit with high linearity Download PDFInfo
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- CN109375699A CN109375699A CN201811345542.7A CN201811345542A CN109375699A CN 109375699 A CN109375699 A CN 109375699A CN 201811345542 A CN201811345542 A CN 201811345542A CN 109375699 A CN109375699 A CN 109375699A
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- effect tube
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
- G05F3/262—Current mirrors using field-effect transistors only
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- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of voltage-current converter circuits with high linearity, including input resistance, trsanscondutance amplifier, first and second field-effect tube, amplifier output level generation device.One end of input resistance is connected with input voltage, the other end is connected with the drain electrode of the inverting input terminal of trsanscondutance amplifier and the first field-effect tube and grid, the positive input of trsanscondutance amplifier is grounded, the grid of first field-effect tube is also directly connected with the grid of the second field-effect tube, the source electrode of first field-effect tube is connected with the output end of trsanscondutance amplifier, the output end of trsanscondutance amplifier is also directly connected with the source electrode of the second field-effect tube, the source electrode of second field-effect tube is also directly connected with amplifier output level generation device, and the drain electrode of the second field-effect tube is for exporting electric current.The present invention carries out Voltage to current transducer using negative-feedback circuit and linear element, eliminates the non-linear effects of field-effect tube conversion, the linearity of voltage-current converter circuit is greatly improved.
Description
Technical field
The invention belongs to a kind of conversion circuit, in particular to a kind of voltage-current converter circuit with high linearity.
Background technique
It in many Application of integrated circuit fields, needs the electric current that is converted into of voltage linear, including is based on CSI
The VTC (Voltage to Time Converter) of (Current Srarved Inverter) and the ADC based on electric current
In Application of integrated circuit such as (Analog to Digital Converter), require voltage linear being converted into electric current
Signal.
Current most common voltage turn current system be using field-effect tube work saturation region current-voltage characteristic into
Row conversion, the linearity depends critically upon the characteristic of field-effect tube, non-linear very serious, greatly limits it in linearity
Application in higher circuit.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of Voltage to current transducer electricity with high linearity
Road.
A kind of voltage-current converter circuit with high linearity provided by the present invention, for converting input voltage into
Electric current is exported, the conversion circuit includes input resistance, trsanscondutance amplifier, first and second field-effect tube, amplifier output electricity
It shows no increases in output generating apparatus, one end of the input resistance is connected with input voltage, the inverting input terminal phase of the other end and trsanscondutance amplifier
Even, being also directly connected with the drain electrode of the first field-effect tube and grid, the positive input of the trsanscondutance amplifier is grounded, and described the
The grid of one field-effect tube is also directly connected with the grid of the second field-effect tube, and the source electrode of first field-effect tube is put with mutual conductance
The output end of big device is connected, and the output end of the trsanscondutance amplifier is also directly connected with the source electrode of the second field-effect tube, and described the
The source electrode of two field-effect tube is also directly connected with amplifier output level generation device, and the drain electrode of second field-effect tube is used for
Export electric current.
Further, the amplifier output level generation device is output resistance, the source electrode of second field-effect tube
It is grounded by output resistance.
Further, the amplifier output level generation device is third field-effect tube, the third field-effect tube
Source electrode ground connection, drain electrode are connected with the source electrode of the second field-effect tube, and the grid and amplifier output stage of the third field-effect tube are inclined
Voltage is set to be connected.
Further, the conversion circuit further includes the 4th field-effect tube, and the 4th field-effect tube grade is coupled to second
The drain electrode of effect pipe.
Further, the drain electrode of the 4th field-effect tube is for exporting electric current, the drain electrode of source electrode and the second field-effect tube
It is connected, the grid of the 4th field-effect tube is connected with amplifier output stage bias voltage.
Further, first field-effect tube is identical as the type of device of the second field-effect tube, gate source voltage difference, and
The proportional relationship of size.
The present invention is converted input voltage into defeated using negative-feedback operational amplification circuit " empty short " and " void is disconnected " working characteristics
Enter electric current and feedback current, recycle the current mirror principle of field-effect tube, the first field-effect tube and the second field-effect tube are constituted
Current mirroring circuit makes current mirror output as feedback current, finally by input voltage it is linear be converted into output electric current.The structure is defeated
The electric current linearity is substantially limited only in the input resistance linearity out, is based on field-effect tube saturation region voltage and current special efficacy with tradition
VTC compare, greatly improve the Voltage to current transducer linearity.
Detailed description of the invention
Fig. 1 is a kind of circuit of first better embodiment of the voltage-current converter circuit with high linearity of the present invention
Figure.
Fig. 2 is a kind of circuit of second better embodiment of the voltage-current converter circuit with high linearity of the present invention
Figure.
Fig. 3 is a kind of circuit of the third better embodiment of the voltage-current converter circuit with high linearity of the present invention
Figure.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It please refers to shown in Fig. 1, is the of a kind of current/charge-voltage convertor with high linearity of the present invention
The circuit diagram of one better embodiment.The better embodiment of the current/charge-voltage convertor with high linearity includes
Input resistance Rin, trsanscondutance amplifier AMP, field-effect tube MfbAnd Mout, output resistance Rout.The input resistance RinOne end with
Input voltage VinBe connected, the other end is connected with the inverting input terminal of trsanscondutance amplifier AMP, also directly with field-effect tube MfbLeakage
Pole and grid are connected.The positive input of the trsanscondutance amplifier AMP is grounded.The field-effect tube MfbGrid also directly with field
Effect pipe MoutGrid be connected, the field-effect tube MfbSource electrode be connected with the output end of trsanscondutance amplifier AMP.
The output end of the trsanscondutance amplifier AMP also directly with field-effect tube MoutSource electrode be connected, the field-effect tube
MoutSource electrode also directly pass through output resistance RoutAfter be grounded.The field-effect tube MoutDrain electrode for exporting electric current Iout。
In present embodiment, the input resistance RinFor by input voltage VinIt is converted into input current Iin, the mutual conductance
Amplifier AMP, input resistance RinAnd field-effect tube MfbConstitute negative-feedback operational amplification circuit, the field-effect tube MfbFor producing
Raw feedback current Ifb, according to the feature of input terminal " empty short " and " void is disconnected " of negative-feedback operational amplification circuit, feedback current Ifb
With input current IinIt is equal, i.e. Ifb=Iin, and feedback current IfbIt is field-effect tube M as current mirroroutGrid and source
Pole provides voltage difference, the field-effect tube MoutFor generating feedback current IfbImage current, and provide needed for ratio output
Electric current Iout, the output resistance RoutFor generating the output level of trsanscondutance amplifier AMP.
Specifically, work of the conversion circuit of the present invention using negative-feedback operational amplification circuit " empty short " and " void is disconnected "
Characteristic is by input voltage VinBe converted to input current IinWith feedback current Ifb, the current mirror principle of field-effect tube is recycled, by field
Effect pipe MfbWith field-effect tube MoutCurrent mirroring circuit is constituted, makes to export electric current IoutMirror image feedback current Ifb, finally will input electricity
Press VinLinear is converted into output electric current Iout。
According to negative-feedback operational amplification circuit " empty short " characteristic, input resistance RinBoth end voltage is respectively input voltage Vin
With ground level " 0 ", input resistance R is flowed throughinElectric current then are as follows: Iin=Vin/Rin.According to negative-feedback operational amplification circuit " void is disconnected "
Characteristic flows through input resistance RinElectric current will all flow through field-effect tube Mfb, i.e. negative feedback current IfbEqual to input current Iin。
According to the working characteristics of field-effect tube, the electric current for flowing through field-effect tube depends entirely on its grid and source voltage
Difference, physical relationship are as follows:
Wherein: μ0Indicate field-effect tube carrier mobility, CosIndicate unit
Area field-effect tube gate oxide capacitance, W indicate field-effect tube channel width, and L indicates field-effect tube channel length, VgsIndicate field
Voltage difference between the grid and source electrode of effect pipe, VthIndicate field-effect tube threshold voltage.
In the present invention, field-effect tube MoutWith field-effect tube MfbType of device, gate source voltage difference it is identical, and ruler
Very little proportional relationship:
Wherein N indicates that natural number, W indicate field-effect tube channel width, and L indicates field-effect tube channel length.
Therefore, field-effect tube M is flowed through in the present inventionoutOutput electric current IoutTo flow through field-effect tube MfbFeedback current
IfbN times, it may be assumed that
Wherein N indicates natural number.
To make the present invention realize, input voltage linearisation is converted to the design object of output electric current.
It is the of the voltage-current converter circuit of the present invention with high linearity please continue to refer to shown in Fig. 2
The circuit diagram of two better embodiments.The second of voltage-current converter circuit of the present invention with high linearity is preferably real
The difference for applying mode and the first better embodiment is: by output resistance RoutReplace with field-effect tube Mao, wherein the field
Effect pipe MaoSource electrode ground connection, drain electrode with field-effect tube MoutSource electrode be connected, field-effect tube MaoGrid and amplifier export
Grade bias voltage VbampIt is connected.
In present embodiment, the field-effect tube MaoIt is equally used for generating the output level of trsanscondutance amplifier AMP.Other realities
It applies and other amplifier output level generation devices also can be used in mode, as long as it can generate output electricity for trsanscondutance amplifier
It is flat.
It is the of the voltage-current converter circuit of the present invention with high linearity please continue to refer to shown in Fig. 3
The circuit diagram of three better embodiments.The second of voltage-current converter circuit of the present invention with high linearity is preferably real
That applies mode and the first better embodiment is distinguished as scene effect pipe MoutDrain electrode cascade a field-effect tube Mcascode, should
Field-effect tube McascodeFor improving output impedance, influence of the output voltage to output electric current is reduced.Specifically, the field-effect
Pipe McascodeDrain electrode for exporting electric current Iout, source electrode and field-effect tube MoutDrain electrode be connected, the field-effect tube Mcascode
Grid and amplifier output stage bias voltage VbiasIt is connected.
The above is only embodiments of the present invention, are not intended to limit the scope of the invention, all to utilize the present invention
Equivalent structure made by specification and accompanying drawing content is directly or indirectly used in other related technical areas, similarly at this
Within the scope of patent protection of invention.
Claims (6)
1. a kind of voltage-current converter circuit with high linearity, for converting input voltage into output electric current, feature
Be: the conversion circuit includes input resistance, trsanscondutance amplifier, first and second field-effect tube, amplifier output level production
One end of generating apparatus, the input resistance is connected with input voltage, and the other end is connected with the inverting input terminal of trsanscondutance amplifier, also
Directly it is connected with the drain electrode of the first field-effect tube and grid, the positive input ground connection of the trsanscondutance amplifier, described first
The grid of effect pipe is also directly connected with the grid of the second field-effect tube, the source electrode and trsanscondutance amplifier of first field-effect tube
Output end be connected, the output end of the trsanscondutance amplifier is also directly connected with the source electrode of the second field-effect tube, described second
The source electrode of effect pipe is also directly connected with amplifier output level generation device, and the drain electrode of second field-effect tube is for exporting
Electric current.
2. as described in claim 1 with the voltage-current converter circuit of high linearity, it is characterised in that: the amplifier is defeated
Level generation device is output resistance out, and the source electrode of second field-effect tube is grounded by output resistance.
3. as described in claim 1 with the voltage-current converter circuit of high linearity, it is characterised in that: the amplifier is defeated
Level generation device is third field-effect tube out, and the source electrode of the third field-effect tube is grounded, drain electrode and the second field-effect tube
Source electrode is connected, and the grid of the third field-effect tube is connected with amplifier output stage bias voltage.
4. as described in claim 1 with the voltage-current converter circuit of high linearity, it is characterised in that: the conversion circuit
It further include the 4th field-effect tube, the 4th field-effect tube grade is coupled to the drain electrode of the second field-effect tube.
5. as claimed in claim 4 with the voltage-current converter circuit of high linearity, it is characterised in that: the 4th effect
Should pipe drain electrode for exporting electric current, source electrode is connected with the drain electrode of the second field-effect tube, the grid of the 4th field-effect tube and
Amplifier output stage bias voltage is connected.
6. as described in claim 1 with the voltage-current converter circuit of high linearity, it is characterised in that: first effect
, and size proportional relationship identical as the type of device of the second field-effect tube, gate source voltage difference should be managed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811345542.7A CN109375699B (en) | 2018-11-13 | 2018-11-13 | Voltage-current conversion circuit with high linearity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811345542.7A CN109375699B (en) | 2018-11-13 | 2018-11-13 | Voltage-current conversion circuit with high linearity |
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| Publication Number | Publication Date |
|---|---|
| CN109375699A true CN109375699A (en) | 2019-02-22 |
| CN109375699B CN109375699B (en) | 2020-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811345542.7A Active CN109375699B (en) | 2018-11-13 | 2018-11-13 | Voltage-current conversion circuit with high linearity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904931A (en) * | 2021-01-15 | 2021-06-04 | 北京智芯微电子科技有限公司 | Voltage-current conversion circuit and integrated circuit chip |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10322185A (en) * | 1997-05-16 | 1998-12-04 | Nec Corp | Semiconductor integrated circuit device |
| JP2000182241A (en) * | 1998-12-16 | 2000-06-30 | Hitachi Ltd | Head amplifier and optical disk device using it |
| CN103324230A (en) * | 2012-03-21 | 2013-09-25 | 华润矽威科技（上海）有限公司 | Voltage-current convertor |
| CN206413094U (en) * | 2016-11-04 | 2017-08-15 | 刘强 | A kind of row level adc circuit for cmos image sensor |
| CN107478890A (en) * | 2017-08-24 | 2017-12-15 | 郑州云海信息技术有限公司 | A kind of current sensing means for integrated circuit |
-
2018
- 2018-11-13 CN CN201811345542.7A patent/CN109375699B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10322185A (en) * | 1997-05-16 | 1998-12-04 | Nec Corp | Semiconductor integrated circuit device |
| JP2000182241A (en) * | 1998-12-16 | 2000-06-30 | Hitachi Ltd | Head amplifier and optical disk device using it |
| CN103324230A (en) * | 2012-03-21 | 2013-09-25 | 华润矽威科技（上海）有限公司 | Voltage-current convertor |
| CN206413094U (en) * | 2016-11-04 | 2017-08-15 | 刘强 | A kind of row level adc circuit for cmos image sensor |
| CN107478890A (en) * | 2017-08-24 | 2017-12-15 | 郑州云海信息技术有限公司 | A kind of current sensing means for integrated circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904931A (en) * | 2021-01-15 | 2021-06-04 | 北京智芯微电子科技有限公司 | Voltage-current conversion circuit and integrated circuit chip |
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| CN109375699B (en) | 2020-04-21 |
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