CN106774618B - A kind of differential voltage turns current circuit - Google Patents
A kind of differential voltage turns current circuit Download PDFInfo
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- CN106774618B CN106774618B CN201710079382.5A CN201710079382A CN106774618B CN 106774618 B CN106774618 B CN 106774618B CN 201710079382 A CN201710079382 A CN 201710079382A CN 106774618 B CN106774618 B CN 106774618B
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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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Abstract
The invention discloses a kind of differential voltage to turn current circuit, including：Differential amplifier circuit, for the first input voltage V1, the second input voltage V2 to be converted into the first electric current I1, the second electric current I2；And first to the 8th mirror-image constant flow source, by the present invention, realize a kind of differential voltage of the absolute value of output current reaction input voltage difference and turn current circuit.
Description
Technical field
The present invention relates to a kind of circuit, turns current circuit more particularly to a kind of differential voltage.
Background technology
Voltage-current conversion circuit is the conventional module in analog circuit, and single metal-oxide-semiconductor is that simplest voltage turns electric current electricity
Road, trsanscondutance amplifier OTA are common Voltage-current conversion circuits, and according to application demand, the voltage for having different structure turns electric current electricity
Road.
Fig. 1 is that two kinds of exemplary voltages turn current circuit, wherein, Fig. 1 (a) is that typical single ended voltage turns current circuit, according to
Circuit theory, which is not difficult to obtain the single ended voltage and turns the voltage-current relationship of current circuit (common source amplifying circuit), is：
Iout=I1=gm1× V1,
Wherein, gm1For metal-oxide-semiconductor M1 mutual conductance, V1 is input voltage；
Fig. 1 (b) is that typical differential voltage turns current circuit, and being not difficult to obtain the differential voltage according to Circuit theory turns electric current electricity
The voltage-current relationship on road is
Iout=I1-I2=gm1× (V1-V2),
Wherein, gm1For metal-oxide-semiconductor M1, M2 mutual conductance, V1, V2 are input voltage, if output is terminated with electric capacity, as I1 ＞ I2
When, circuit charges to electric capacity, and as I1 ＞ I2, circuit extracts electric charge (electric capacity electric discharge) from electric capacity, it is seen that output current Iout has
It is directional, and many times wish output current Iout without directionality, it is necessary to it is a kind of can react input voltage difference
The Voltage-current conversion circuit of absolute value, the differential voltage of prior art, which turns current circuit, can not then realize.
The content of the invention
To overcome above-mentioned the shortcomings of the prior art, the purpose of the present invention is that providing a kind of differential voltage turns electric current electricity
Road, to realize that a kind of differential voltage of the absolute value of output current reaction input voltage difference turns current circuit.
In view of the above and other objects, the present invention proposes that a kind of differential voltage turns current circuit, including：
Differential amplifier circuit, for the first input voltage V1, the second input voltage V2 to be converted into the first electric current I1, second
Electric current I2；
First mirror-image constant flow source, the first electric current I1 for the differential amplifier circuit to be exported export two-way size and are respectively
I1 sink current；
Second mirror-image constant flow source, the second electric current I2 for the differential amplifier circuit to be exported export two-way size and are respectively
I2 sink current；
3rd mirror-image constant flow source, the sink current that the size for one of first mirror-image constant flow source to be exported is I1 switch to greatly
The small sourcing current for I1；
4th mirror-image constant flow source, the sink current that the size for one of second mirror-image constant flow source to be exported is I2 switch to greatly
The small sourcing current for I2；
5th mirror-image constant flow source, for the sink current of another output of first mirror-image constant flow source and the 4th mirror image is permanent
The difference of the sourcing current of stream source output is converted to the 3rd sink current I3 outputs；
6th mirror-image constant flow source, for the sink current of another output of second mirror-image constant flow source and the 3rd mirror image is permanent
The difference of the sourcing current of stream source output is converted to the 4th sink current I4 outputs；
7th mirror-image constant flow source, the 3rd sink current I3 for the 5th mirror-image constant flow source to be exported are converted to the 5th drawing electricity
Flow I5；
8th mirror-image constant flow source, the 4th sink current I4 for the 6th mirror-image constant flow source to be exported are converted to the 6th drawing electricity
Flow I6.
Further, the differential amplifier circuit includes the first NMOS tube, the second NMOS tube and the 3rd NMOS tube, and this first
NMOS tube, the second NMOS tube are used to first input voltage V1, the second input voltage V2 being converted to first electric current I1, second
Electric current I2, the 3rd NMOS tube are biasing circuit.
Further, first mirror-image constant flow source includes the 17th PMOS, the 18th PMOS and the 19th PMOS
Pipe, connect into diode the 17th PMOS be used as the differential amplifier circuit amplifying circuit all the way the first NMOS
The active load of pipe, the first electric current I1 that first input voltage V1 is converted to flow through the 17th PMOS, and the 18th
PMOS is connected to form mirror image efferent duct with the 19th PMOS grid with the 17th PMOS grid, and it is big to export two-way respectively
The small sink current for I1.
Further, second mirror-image constant flow source includes the 12nd PMOS, the 13rd PMOS and the 14th PMOS
Pipe, connect into diode the 12nd PMOS be used as the differential amplifier circuit another way amplifying circuit second
The active load of NMOS tube, the second electric current I2 that second input voltage V2 is converted to flow through the 12nd PMOS, and the tenth
Three PMOSs are connected to form mirror image efferent duct with the 14th PMOS grid with the 12nd PMOS grid, export two-way respectively
Size is I2 sink current.
Further, the 3rd mirror-image constant flow source includes the 8th NMOS tube and the 5th NMOS tube, and the 8th NMOS tube uses
Diode-connected, the 5th NMOS tube are efferent duct, for the size for exporting the 18th PMOS of the first mirror image constant current
Switch to the sourcing current that size is I1 for I1 sink current.
Further, the 4th mirror-image constant flow source includes the 4th NMOS tube and the 9th NMOS tube, and the 4th NMOS tube uses
Diode-connected, the 9th NMOS tube are efferent duct, big for the 13rd PMOS of second mirror-image constant flow source to be exported
Small is that I2 sink current switchs to the sourcing current that size is I2.
Further, the 5th mirror-image constant flow source includes the 20th NMOS tube and the 21st NMOS tube, and the 20th
NMOS tube uses diode-connected, and the 21st NMOS tube is efferent duct, for by the 19th of first mirror-image constant flow source the
It is defeated that the difference for the sourcing current that the sink current of PMOS efferent ducts output exports with the 4th mirror-image constant flow source is converted to the 3rd sink current I3
Go out.
Further, the 6th mirror-image constant flow source includes the 15th NMOS tube and the 16th NMOS tube, the 15th NMOS
Pipe uses diode-connected, and the 16th NMOS tube is efferent duct, for by the 14th PMOS of second mirror-image constant flow source
The difference of the sink current of output and the sourcing current of the 3rd mirror-image constant flow source output is converted to the 4th sink current I4 outputs.
Further, the 7th mirror-image constant flow source includes the tenth NMOS tube and the 11st NMOS tube, and the tenth NMOS tube is adopted
With diode-connected, the 11st NMOS tube is efferent duct, for the 3rd sink current I3 for exporting the 5th mirror-image constant flow source
Be converted to the 5th sourcing current I5.
Further, the 8th mirror-image constant flow source includes the 6th NMOS tube and the 7th NMOS tube, and the 6th NMOS tube uses two
Pole pipe connection, the 7th NMOS tube are efferent duct, and the 4th sink current I4 for the 6th mirror-image constant flow source to be exported is converted to
6th sourcing current I6.
Compared with prior art, a kind of differential voltage of the present invention, which turns current circuit, realizes one kind to react input voltage poor
Absolute value Voltage-current conversion circuit, it can be used in some measuring circuits, and output current is big when making input pressure difference big, defeated
It is small to enter pressure difference hour output current, can regulate the speed and precision with dynamic self-adapting.
Brief description of the drawings
Fig. 1 (a) is that typical single ended voltage turns current circuit；
Fig. 1 (b) is that typical differential voltage turns current circuit；
Fig. 2 is the structural representation that a kind of differential voltage of the present invention turns current circuit.
Embodiment
Below by way of specific instantiation and embodiments of the present invention are described with reference to the drawings, those skilled in the art can
Understand the further advantage and effect of the present invention easily by content disclosed in the present specification.The present invention can also pass through other differences
Instantiation implemented or applied, the various details in this specification also can be based on different viewpoints with application, without departing substantially from
Various modifications and change are carried out under the spirit of the present invention.
Fig. 2 is the structural representation that a kind of differential voltage of the present invention turns current circuit.As shown in Fig. 2 the present invention is a kind of poor
Component voltage turns current circuit, including：The mirror-image constant flow source 10 of differential amplifier circuit 90 and first, the second mirror-image constant flow source the 20, the 3rd
Mirror-image constant flow source 30, the 4th mirror-image constant flow source 40, the 5th mirror-image constant flow source 50, the 6th mirror-image constant flow source 60, the 7th mirror image constant current
Source 70, the 8th mirror-image constant flow source 80.
Wherein, differential amplifier circuit 90 is made up of NMOS tube M1, M2, M3, and NMOS tube M1, M2 is used for the first input voltage
V1, the second input voltage V2 are converted to electric current I1, I2, and NMOS tube M3 is biasing circuit；First mirror-image constant flow source 10 is by PMOS
M17, M18, M19 are formed, and the PMOS M17 for connecting into diode is used as the amplifying circuit all the way of differential amplifier circuit 90
The active load of (NMOS tube M1), the first electric current I1 that the first input voltage V1 is converted to flow through M17, PMOS M18, M19
Grid is connected to form mirror image efferent duct with PMOS M17 grids, exports the sink current that two-way size is I1 respectively；Second mirror image is permanent
Stream source 20 is made up of PMOS M12, M13, M14, and the PMOS M12 for connecting into diode is used as the another of differential amplifier circuit 90
The active load of amplifying circuit (NMOS tube M2) all the way, the second electric current I2 that the second input voltage V2 is converted to flow through M12,
PMOS M13, M14 grid and PMOS M12 grids are connected to form mirror image efferent duct, export the filling electricity that two-way size is I2 respectively
Stream；3rd mirror-image constant flow source 30 is made up of NMOS tube M8, M5, and NMOS tube M8 is diode-connected, and NMOS tube M5 is efferent duct, is used
Switch to the drawing electricity that size is I1 in the sink current for being I1 by the size of the PMOS efferent ducts M18 outputs of the first mirror-image constant flow source 10
Stream；4th mirror-image constant flow source 40 is made up of NMOS tube M4, M9, and NMOS tube M4 is diode-connected, and NMOS tube M9 is efferent duct, is used
Switch to the drawing electricity that size is I2 in the sink current for being I2 by the size of the PMOS efferent ducts M13 outputs of the second mirror-image constant flow source 20
Stream；5th mirror-image constant flow source 50 is made up of NMOS tube M20, M21, and NMOS tube M20 is diode-connected, and NMOS tube M21 is output
Pipe, for export the sink current of the PMOS efferent ducts M19 outputs of the first mirror-image constant flow source 10 with the 4th mirror-image constant flow source 40
The difference of sourcing current is converted to the 3rd sink current I3 outputs, and as I1 ＜ I2, I3=I1-I2, as I1 ＞ I2, I3=0；6th
Mirror-image constant flow source 60 is made up of NMOS tube M15, M16, and NMOS tube M15 is diode-connected, and NMOS tube M16 is efferent duct, is used for
The sourcing current that the sink current that the PMOS efferent ducts M14 of second mirror-image constant flow source 20 is exported is exported with the 3rd mirror-image constant flow source 30
Difference is converted to the 4th sink current I4 outputs, as I1 ＜ I2, I4=0, and as I1 ＞ I2, I4=I1-I2；7th mirror-image constant flow source
70 are made up of NMOS tube M10, M11, and NMOS tube M10 is diode-connected, and NMOS tube M11 is efferent duct, for by the 5th mirror image
The 3rd sink current I3 that constant-current source 50 exports is converted to the 5th sourcing current I5；8th mirror-image constant flow source 80 is by NMOS tube M6, M7 group
Into NMOS tube M6 is diode-connected, and NMOS tube M7 is efferent duct, and the 4th for the 6th mirror-image constant flow source 60 to be exported fills electricity
Stream I4 is converted to the 6th sourcing current I6.
Specifically, NMOS tube M8, M5, M4, M9, M6, M7, M10, M11, M3 source ground, PMOS M17, M18,
M19, M12, M13, M14, M20, M21, M15, M16 source electrode connect power supply；The grid of NMOS tube M1, M2 connects the first input electricity respectively
V1, the second input voltage V2 are pressed, the source electrode of NMOS tube M1, M2 is connected to biasing NMOS tube M3 drain electrode, biasing NMOS tube M3's
Grid meets bias voltage Vbias；NMOS tube M1 drain electrode connects the drain electrode of PMOS M17, M18, M19 grid and PMOS M17,
NMOS tube M2 drain electrode connects the drain electrode of PMOS M12, M13, M14 grid and PMOS M12, and PMOS M18 drain electrode connects
The drain electrode of the grid and NMOS tube M8 of NMOS tube M8, M5, PMOS M13 drain electrode connect the grid and NMOS tube of NMOS tube M4, M9
M4 drain electrode, PMOS M19 drain electrode connect drain electrode, the NMOS tube M9 leakage of the grid and PMOS M20 of PMOS M20, M21
Pole, PMOS M14 drain electrode connect drain electrode, the NMOS tube M5 drain electrode of the grid and PMOS M15 of PMOS M15, M16；PMOS
Pipe M21 drain electrode connects the drain electrode of the grid and NMOS tube M10 of NMOS tube M10, M11, PMOS M16 drain electrode connect NMOS tube M6,
The drain electrode of M7 grid and NMOS tube M6；NMOS tube M11 drain electrode is connected to form output current Iout with NMOS tube M6 drain electrode
Output node.
Assuming that all current mirror ratios 1:1, it is not difficult to obtain output current Iout=I5+I6=I3+I4 by kirchhoff.When
During I1 ＞ I2, the electric current flowed through in the PMOS M15 of the 6th mirror-image constant flow source 60 is I1-I2, and PMOS M16 and PMOS
M15 mirror images connect, then flow through and flowed through in PMOS M16 electric current I4=I1-I2, the PMOS M20 of the 5th mirror-image constant flow source 50
Electric current be 0, and PMOS M21 is connected with PMOS M20 mirror images, then flows through PMOS M21 electric current I3=0, therefore Iout=
I5+I6=I3+I4=I1-I2, i.e. Iout=| I1-I2 |；As I1 ＜ I2, in the PMOS M15 of the 6th mirror-image constant flow source 60
The electric current flowed through is 0, and PMOS M16 is connected with PMOS M15 mirror images, then flows through PMOS M16 electric current I4=0, the 5th
The electric current flowed through in the PMOS M20 of mirror-image constant flow source 50 is I2-I1, and PMOS M21 is connected with PMOS M20 mirror images, then
Flow through PMOS M21 electric current I3=I2-I1, therefore Iout=I5+I6=I3+I4=I2-I1, i.e. Iout=| I1-I2 |；Assuming that
The mutual conductance of NMOS tube M1, M2 of differential amplifier circuit 90 is gm1, due to I1=gm1× V1, I2=gm1× V2, then obtain Iout
=gm1× | V1-V2 |, i.e., output current and differential voltage (the first input voltage V1 and the second input voltage V2 difference) is absolute
It is worth directly proportional.
In summary, a kind of differential voltage of the present invention turns current circuit and realized a kind of to react the absolute of input voltage difference
The Voltage-current conversion circuit of value, it can be used in some measuring circuits, and output current is big when making input pressure difference big, input pressure difference
Hour output current is small, can regulate the speed and precision with dynamic self-adapting.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.Any
Art personnel can be modified above-described embodiment and changed under the spirit and scope without prejudice to the present invention.Therefore,
The scope of the present invention, should be as listed by claims.
Claims (10)
1. a kind of differential voltage turns current circuit, including：
Differential amplifier circuit, for the first input voltage V1, the second input voltage V2 to be converted into the first electric current I1, the second electric current
I2；
First mirror-image constant flow source, it is I1's that the first electric current I1 for the differential amplifier circuit to be exported exports two-way size respectively
Sink current；
Second mirror-image constant flow source, it is I2's that the second electric current I2 for the differential amplifier circuit to be exported exports two-way size respectively
Sink current；
3rd mirror-image constant flow source, the sink current that the size for one of first mirror-image constant flow source to be exported is I1 switch to size and are
I1 sourcing current；
4th mirror-image constant flow source, the sink current that the size for one of second mirror-image constant flow source to be exported is I2 switch to size and are
I2 sourcing current；
5th mirror-image constant flow source, for by the sink current of another output of first mirror-image constant flow source and the 4th mirror-image constant flow source
The difference of the sourcing current of output is converted to the 3rd sink current I3 outputs；
6th mirror-image constant flow source, for by the sink current of another output of second mirror-image constant flow source and the 3rd mirror-image constant flow source
The difference of the sourcing current of output is converted to the 4th sink current I4 outputs；
7th mirror-image constant flow source, the 3rd sink current I3 for the 5th mirror-image constant flow source to be exported are converted to the 5th sourcing current
I5；
8th mirror-image constant flow source, the 4th sink current I4 for the 6th mirror-image constant flow source to be exported are converted to the 6th sourcing current
I6。
2. a kind of differential voltage as claimed in claim 1 turns current circuit, it is characterised in that：The differential amplifier circuit includes the
One NMOS tube, the second NMOS tube and the 3rd NMOS tube, first NMOS tube, the second NMOS tube are used for first input voltage
V1, the second input voltage V2 are converted to first electric current I1, the second electric current I2, and the 3rd NMOS tube is biasing circuit.
3. a kind of differential voltage as claimed in claim 2 turns current circuit, it is characterised in that：First mirror-image constant flow source includes
17th PMOS, the 18th PMOS and the 19th PMOS, the 17th PMOS for connecting into diode are used as making
For the active load of the first NMOS tube of the amplifying circuit all the way of the differential amplifier circuit, first input voltage V1 is converted to
The first electric current I1 flow through the 17th PMOS, the 18th PMOS and the 19th PMOS grid and the 17th PMOS
Grid is connected to form mirror image efferent duct, exports the sink current that two-way size is I1 respectively.
4. a kind of differential voltage as claimed in claim 3 turns current circuit, it is characterised in that：Second mirror-image constant flow source includes
12nd PMOS, the 13rd PMOS and the 14th PMOS, the 12nd PMOS for connecting into diode are used as making
For the active load of the second NMOS tube of the another way amplifying circuit of the differential amplifier circuit, second input voltage V2 is changed
To the second electric current I2 flow through the 12nd PMOS, the 13rd PMOS and the 14th PMOS grid and the 12nd PMOS
Tube grid is connected to form mirror image efferent duct, exports the sink current that two-way size is I2 respectively.
5. a kind of differential voltage as claimed in claim 4 turns current circuit, it is characterised in that：3rd mirror-image constant flow source includes
8th NMOS tube and the 5th NMOS tube, the 8th NMOS tube use diode-connected, and the 5th NMOS tube is efferent duct, for inciting somebody to action
The sink current that the size of the 18th PMOS output of the first mirror image constant current is I1 switchs to the sourcing current that size is I1.
6. a kind of differential voltage as claimed in claim 5 turns current circuit, it is characterised in that：4th mirror-image constant flow source includes
4th NMOS tube and the 9th NMOS tube, the 4th NMOS tube use diode-connected, and the 9th NMOS tube is efferent duct, for inciting somebody to action
The sink current that the size of the 13rd PMOS output of second mirror-image constant flow source is I2 switchs to the sourcing current that size is I2.
7. a kind of differential voltage as claimed in claim 6 turns current circuit, it is characterised in that：5th mirror-image constant flow source includes
20th NMOS tube and the 21st NMOS tube, the 20th NMOS tube use diode-connected, and the 21st NMOS tube is
Efferent duct, for the sink current for exporting the 19th PMOS efferent ducts of first mirror-image constant flow source and the 4th mirror-image constant flow source
The difference of the sourcing current of output is converted to the 3rd sink current I3 outputs.
8. a kind of differential voltage as claimed in claim 7 turns current circuit, it is characterised in that：6th mirror-image constant flow source includes
15th NMOS tube and the 16th NMOS tube, the 15th NMOS tube use diode-connected, and the 16th NMOS tube is output
Pipe, for the drawing for exporting the sink current of the 14th PMOS output of second mirror-image constant flow source with the 3rd mirror-image constant flow source
The difference of electric current is converted to the 4th sink current I4 outputs.
9. a kind of differential voltage as claimed in claim 8 turns current circuit, it is characterised in that：7th mirror-image constant flow source includes
Tenth NMOS tube and the 11st NMOS tube, the tenth NMOS tube use diode-connected, and the 11st NMOS tube is efferent duct, use
The 5th sourcing current I5 is converted in the 3rd sink current I3 for exporting the 5th mirror-image constant flow source.
10. a kind of differential voltage as claimed in claim 9 turns current circuit, it is characterised in that：8th mirror-image constant flow source includes
6th NMOS tube and the 7th NMOS tube, the 6th NMOS tube use diode-connected, and the 7th NMOS tube is efferent duct, for inciting somebody to action
4th sink current I4 of the 6th mirror-image constant flow source output is converted to the 6th sourcing current I6.
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|---|---|---|---|
| CN201710079382.5A CN106774618B (en) | 2017-02-14 | 2017-02-14 | A kind of differential voltage turns current circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710079382.5A CN106774618B (en) | 2017-02-14 | 2017-02-14 | A kind of differential voltage turns current circuit |
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| CN106774618B true CN106774618B (en) | 2018-03-06 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2406234A (en) * | 2003-09-15 | 2005-03-23 | Agilent Technologies Inc | A PLL charge pump having well-matched source and sink currents |
| JP2005260488A (en) * | 2004-03-10 | 2005-09-22 | Mitsubishi Electric Corp | Voltage/current converting circuit |
| CN101534101A (en) * | 2008-03-13 | 2009-09-16 | 恩益禧电子股份有限公司 | Differential amplifier |
| CN102520757A (en) * | 2011-12-28 | 2012-06-27 | 南京邮电大学 | Sink current and source current generating circuit |
| CN205028190U (en) * | 2015-06-23 | 2016-02-10 | 北京兆易创新科技股份有限公司 | Voltage control device and voltage generation system |
-
2017
- 2017-02-14 CN CN201710079382.5A patent/CN106774618B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2406234A (en) * | 2003-09-15 | 2005-03-23 | Agilent Technologies Inc | A PLL charge pump having well-matched source and sink currents |
| JP2005260488A (en) * | 2004-03-10 | 2005-09-22 | Mitsubishi Electric Corp | Voltage/current converting circuit |
| CN101534101A (en) * | 2008-03-13 | 2009-09-16 | 恩益禧电子股份有限公司 | Differential amplifier |
| CN102520757A (en) * | 2011-12-28 | 2012-06-27 | 南京邮电大学 | Sink current and source current generating circuit |
| CN205028190U (en) * | 2015-06-23 | 2016-02-10 | 北京兆易创新科技股份有限公司 | Voltage control device and voltage generation system |
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| CN106774618A (en) | 2017-05-31 |
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