CN106371490A - Design for high-precision current reference circuit - Google Patents
Design for high-precision current reference circuit Download PDFInfo
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- CN106371490A CN106371490A CN201510425021.2A CN201510425021A CN106371490A CN 106371490 A CN106371490 A CN 106371490A CN 201510425021 A CN201510425021 A CN 201510425021A CN 106371490 A CN106371490 A CN 106371490A
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- current
- circuit
- pipe
- temperature
- current reference
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Abstract
The invention belongs to the technical field of integrated circuits and discloses design for a high-precision current reference circuit. The design comprises a first current reference circuit, a second current reference circuit and a maximum current selection circuit, wherein a cascode current mirror structure is adopted by the first and second current reference circuits, so that a power supply rejection ratio of a common current source can be improved, and an independent reference current output can be generated respectively; and the maximum current selection circuit is composed of two groups of cascode current mirrors which can take the larger value between the input currents as the output of the circuit.
Description
Technical field
The present invention relates to technical field of integrated circuits, more particularly, it relates in integrated circuit, it is used for Analogous Integrated Electronic Circuits
Middle use current reference circuit provides the designing technique of precision current.
Technical background
In integrated circuits, a reference source is applied widely, including voltage-reference and current reference source.With integrated
The development of circuit engineering, the performance requirement more and more higher to chip, need the precision of current reference circuit offer electric current also increasingly
High.
The circuit of precision current a reference source can be provided at present to be divided into two kinds: the first is a kind of high-precision in chip internal design
Voltage reference circuit, produces a reference voltage unrelated with temperature, technique, supply voltage, then by adding some circuit
Reference voltage is converted into reference current；Second is directly to pass through to produce a kind of electric current of negative temperature coefficient and a kind of positive temperature system
The electric current of number, and their direct superpositions are compensated, thus obtaining a kind of temperature independent current reference source
Present invention aim at providing a kind of new current reference source circuit, this circuit includes: the first current reference circuit, second
Current reference circuit and maximum current selecting circuit.This design can make current reference source reach relatively when providing accurate reference current
High performance.
Content of the invention
The present invention proposes a kind of new current reference source circuit, and this circuit includes: the first current reference circuit, the second electric current base
Quasi- circuit and maximum current selecting circuit.Using 0.5 μm of bcd technique of csmc, in supply voltage 5v, temperature range
Under the conditions of -40～125 DEG C, it is 13.7ppm/ DEG C by the current temperature coefficient that spectre software emulation obtains, benchmark electricity when 27 DEG C
Flow 7.53 μ a, current change quantity is 0.017 μ a, during low frequency, PSRR is 69.16db.The main contents of this design are:
(1) current reference source circuit includes: first, second current reference circuit and maximum current selecting circuit.
(2) first, second current reference circuit described in includes: nmos pipe m3, m4, m9, m10, m11, m12,
Pmos pipe m0, m1, m2, m5, m6, m7, m8, m13, m14, npn pipe q1, q2.M0～m4
Five mos pipes constitute start-up circuit, and effect is to prevent circuit from entering idle degeneracy state when upper electricity.
M5 and m6 manages, m7 and m8 manages, m9 and m10 manages, and grid is connected m11 with m12 pipe respectively, forms 4
Individual current mirror, for providing reference current to export.
(3) maximum current selecting circuit described in includes: nmos pipe m2, m4, m6, m8, m10, pmos pipe m1,
M3, m5, m7, m9.Wherein m1, m2, m3, m4 pipe and m5, m6, m9, m10 pipe structure respectively
Become two groups of two groups of common-source common-gate current mirrors.
The present invention is directed to the reference current source in Analogous Integrated Electronic Circuits, based on common-source common-gate current mirror circuit, in conjunction with bjt
It is proposed that a kind of new current reference source circuit, this circuit is compensated the characteristic of pipe by the superposition of temperature coefficient, has obtained one kind
Temperature independent current reference source, the reference current finally giving has preferable temperature characterisitic and accuracy.
Brief description
Fig. 1 is existing common current a reference source structural representation.
The integrated circuit structural representation that Fig. 2 provides for the present invention.
Fig. 3 provides first, second current reference circuit construction of electric power schematic diagram for the present invention.
The maximum current selecting circuit structural representation that Fig. 4 provides for the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is elaborated.
Common band gap current reference structure of the prior art is as shown in figure 1, make a, b using above two groups of current mirrors
Two point voltages are equal, and the pressure drop above resistance r1 is the base stage of audion q1, q2 and value of delta v of emitter voltagebe, this
It is the voltage of a positive temperature coefficient, therefore the electric current i above r1r1For positive temperature coefficient, the voltage above resistance r2 is q1
Base-emitter voltage vbe, it is negative temperature coefficient, therefore the electric current i above r2r2For negative temperature coefficient, output current irefFor
ir1、ir2Sum, thus can approximately obtain temperature-independent reference current.The shortcoming of this circuit is: by
In channel modulation effect, current mirror is it cannot be guaranteed that a, b two point voltage is equal, and then leads to output current reference precision not high；
Using basic two-tube current mirror, the psrr (PSRR) of this current reference circuit is not high；This circuit does not use height
Rank temperature-compensating, the temperature coefficient difference of output reference electric current.
The integrated circuit structure that the present invention provides is as shown in Fig. 2 wherein first, second current reference circuit is complete in configuration aspects
Identical, but the resistance of their resistance r1, r2 and r3, and the emitter junction area ratio of audion q1, q2 differs
Sample, by adjusting these parameters, can obtain different output reference electric currents.Particularly as being to allow i1And i2Reaching zero-temperature coefficient
Temperature when coefficient is different, wherein i11 warm coefficient point temperature higher, and i2Lower, so, they are not
There is different temperatures characteristic within the scope of same temperature.The output i of circuitrefFor i1And i2Larger one of intermediate value, has preferable temperature
Degree characteristic.
The first, second current reference circuit construction of electric power that the present invention provides is as shown in Figure 3.First current reference circuit, second
Employ common-source common-gate current mirror structure in current reference circuit, the PSRR in common current source can be improved.It produces respectively
Raw one independent reference current output i1 and i2.Wherein i1 has preferable temperature characterisitic in high temperature and current value is more than
The current value in high temperature for the i2；I2 has preferable temperature characterisitic and current value and is more than i1 in low temperature in low temperature
Current value.Final output current iref is larger one of i1 and i2 intermediate value, so, the output current that obtains in high temperature and
Low-temperature region has preferable temperature characterisitic.Compared to common current source circuit of the prior art, by commonly two-tube electricity above
Stream mirror is improved to common-source common-gate current mirror, so can increase PSRR.Five mos of the m0～m4 on the left side manage as opening
Galvanic electricity road, effect is to prevent circuit from entering idle degeneracy state when upper electricity.Start-up course is as follows: circuit has just gone up electricity
When, m0 and m4 pipe first turns on, and the drain electrode by m4, and that is, the grid voltage of m2 drags down, and m2 pipe turns on, will
The drain voltage of m11 and m12 pipe is drawn high, and so that current mirror m11, m12 is worked, whole circuit is started working；When entirely electric
After the normal work of road, the drain voltage of m5, i.e. the grid voltage rising of m3, m3 pipe is opened, the grid of m4 pipe is drawn
Low, m4 pipe turns off, and m4 drain voltage raises, and then so that m1, m2 pipe is turned off, and thus have turned off open circuit.Its
The breadth length ratio of middle m0 and m3 should very little, to reduce the electric current that flows through, thus reducing power consumption.The output i1 of whole circuit
Export as a current reference.
The maximum current selecting circuit structure that the present invention provides is as shown in Figure 4.Its effect is by larger for input current intermediate value one
The individual output as circuit.As can be seen that circuit is made up of two groups of common-source common-gate current mirrors.Maximum current selecting circuit work is former
Reason is as follows:
Work as i1≥i2When, m1 pipe electric current above is i1-i2, thus m3 tube current is also i1-i2, m5 tube current is i2,
Then iout=i1-i2+i2=i1；Work as i1＜ i2When, m7 pipe can enter linear zone, and electric current is i1, and m1 pipe enters
Subthreshold region, electric current above is negligible, and such m3 pipe electric current above can also be ignored, m5 tube current
For i2, then iout=i2.So circuit just completes the selection of maximum current.
Claims (5)
1. a kind of high-precision current reference circuit designs it is characterised in that comprising the steps of
1) the first current reference circuit, employ common-source common-gate current mirror structure in the second current reference circuit, common electricity can be improved
The PSRR in stream source.It produces an independent reference current output i respectively1And i2.Wherein i1In high temperature
There is preferable temperature characterisitic and current value is more than i2Current value in high temperature；i2Have in low temperature preferably
Temperature characterisitic and current value are more than i1Current value in low temperature, final output current irefFor i1And i2Intermediate value is relatively
Big one；
2), when circuit has just gone up electricity, the start-up circuit in the first current reference circuit, the second current reference circuit starts, entirely electricity
Start working in road；
3) after whole normal circuit operation, m1, m2 pipe turns off, and thus have turned off the start-up circuit in described step (2)；
4) in maximum current selecting circuit, work as i1≥i2When, iout=i1-i2+i2=i1, work as i1＜ i2When, iout=i2；
2. a kind of current reference circuit according to claim 1 it is characterised in that: first, in described step (1)
Two current reference circuits are identical in configuration aspects, but the resistance of their resistance r1, r2 and r3, Yi Jisan
The emitter junction area ratio of pole pipe q1, q2 is different, by adjusting these parameters, can obtain different output references
Electric current.Particularly as being to allow i1And i2Temperature when reaching zero-temperature coefficient is different, wherein i11 warm coefficient point temperature
Degree is higher, and i2Lower, therefore they have different temperatures characteristic within the scope of different temperature.The output i of circuitref
For i1And i2Larger one of intermediate value, has preferable temperature characterisitic.
3. a kind of current reference circuit start-up circuit according to claim 1 it is characterised in that: described step (2) circuit
On firm when electricity, m0 and m4 pipe first turns on, and the drain electrode by m4, and that is, the grid voltage of m2 drags down,
M2 pipe turns on, and the drain voltage of m11 and m12 pipe is drawn high, and so that current mirror m11, m12 is worked, whole circuit
Start working.
4. a kind of current reference circuit breaking circuit according to claim 1 it is characterised in that: described step (3) circuit
After normal work, the drain voltage of m5, i.e. the grid voltage rising of m3, m3 pipe is opened, the grid of m4 pipe is drawn
Low, m4 pipe turns off, and m4 drain voltage raises, and then so that m1, m2 pipe is turned off, and thus have turned off open circuit.
5. a kind of maximum current selecting circuit according to claim 1 it is characterised in that: described step (4) circuit works as i1≥i2
When, m1 pipe electric current above is i1-i2, thus m3 tube current is also i1-i2, m5 tube current is i2, then
iout=i1-i1+i2=i1, work as i1＜ i2When, m7 pipe can enter linear zone, and electric current is i1, and m1 pipe enters
Enter subthreshold region, electric current above is negligible, such m3 pipe electric current above can also be ignored, m5
Tube current is i2, then iout=i2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510425021.2A CN106371490A (en) | 2015-07-20 | 2015-07-20 | Design for high-precision current reference circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510425021.2A CN106371490A (en) | 2015-07-20 | 2015-07-20 | Design for high-precision current reference circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106371490A true CN106371490A (en) | 2017-02-01 |
Family
ID=57879664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510425021.2A Pending CN106371490A (en) | 2015-07-20 | 2015-07-20 | Design for high-precision current reference circuit |
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| CN (1) | CN106371490A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111897390A (en) * | 2020-08-13 | 2020-11-06 | 上海南芯半导体科技有限公司 | Current selection circuit and method thereof |
| CN112825002A (en) * | 2019-11-21 | 2021-05-21 | 中芯国际集成电路制造(上海)有限公司 | Reference current source circuit |
-
2015
- 2015-07-20 CN CN201510425021.2A patent/CN106371490A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112825002A (en) * | 2019-11-21 | 2021-05-21 | 中芯国际集成电路制造(上海)有限公司 | Reference current source circuit |
| CN111897390A (en) * | 2020-08-13 | 2020-11-06 | 上海南芯半导体科技有限公司 | Current selection circuit and method thereof |
| CN111897390B (en) * | 2020-08-13 | 2021-09-24 | 上海南芯半导体科技有限公司 | Current selection circuit and method thereof |
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