CN109765963A - A kind of digital regulated bias current sources - Google Patents
A kind of digital regulated bias current sources Download PDFInfo
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- CN109765963A CN109765963A CN201910067645.XA CN201910067645A CN109765963A CN 109765963 A CN109765963 A CN 109765963A CN 201910067645 A CN201910067645 A CN 201910067645A CN 109765963 A CN109765963 A CN 109765963A
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Abstract
The invention discloses a kind of digital regulated bias current sources, it is related to bias current sources design field in Analogous Integrated Electronic Circuits, including the first current mirror, operational amplifier, resistance adjustment network, second current mirror, the output end of first current mirror is connected to the network through the resistance adjustment to power supply, the inverting input terminal of the operational amplifier is connected with the output end of first current mirror, the non-inverting input terminal of the operational amplifier is connected with the input terminal of second current mirror, the output end of the operational amplifier is connected with the control terminal of second current mirror, the input terminal of second current mirror is connected to power supply through resistance element.Digital regulated bias current sources provided by the invention introduce operational amplifier, and using its empty short principle, auxiliary realizes that electric current accurately replicates；It is controlled using digital logic level control bus, realizes that the wide scope of image current is adjustable.
Description
Technical field
The present invention relates to bias current sources design field in Analogous Integrated Electronic Circuits, more particularly to one kind are digital regulated partially
Set current source.
Background technique
Most of current source is all traditional passive and active bias circuit construction at present.
In traditional simulation bias circuit construction, as shown in Figure 1, the principle of passive biasing circuit is electric resistance partial pressure:VDD is supply voltage.Its main feature is that circuit is simple, precision is high, if however the circuit divider resistance
It is smaller, although the small consumption electric current of area is larger, if low current consumption can be realized but occupy larger area by increasing divider resistance.
In addition, can only provide appropriate bias voltage using resistor voltage divider circuit and can not provide bias current, NMOS transistor M0 is inclined
Set voltage VB1Under the action of generate electric current IOUT1.Bias voltage is general only related with the ratio of resistance, and bias current size is by electricity
Source voltage, technique, temperature fluctuations affect are big；Another common biasing circuit is active bias circuit, as shown in Fig. 2, using
The current mirror of MOS transistor provides suitable bias voltage and electric current, and NMOS transistor M2 is by the electric current of NMOS transistor M1
Reference current I is replicated by MOS transistor dimension scaleREF, bias current is providedBut due to one
As active bias circuit adjustable range it is small, there are wide scope adjust mirror image low precision the shortcomings that.
Therefore, those skilled in the art is dedicated to developing a kind of digital regulated bias current sources, the electricity of this new construction
Stream source has been used for reference the advantages of passive and active bias circuit current source, and operational amplifier is introduced, and using its empty short principle, auxiliary is real
Existing electric current accurately replicates；It is controlled using digital logic level control bus, realizes that the wide scope of image current is adjustable, solve
A wide range of degree of regulation is poor in conventional active biasing circuit, the limited problem of adjustable range, has adjustable range wide, with high accuracy
Advantage.
Summary of the invention
In view of the above drawbacks of the prior art, inclined the technical problem to be solved by the present invention is to how to eliminate conventional active
The a wide range of disadvantage that degree of regulation is poor, adjustable range is limited in circuits.
To achieve the above object, the present invention provides a kind of digital regulated bias current sources, including the first current mirror, operation
Amplifier, resistance adjustment network, the second current mirror, the output end of first current mirror through the resistance adjustment be connected to the network to
Power supply, the inverting input terminal of the operational amplifier are connected with the output end of first current mirror, the operational amplifier
Non-inverting input terminal be connected with the input terminal of second current mirror, the output end of the operational amplifier and it is described second electricity
The control terminal of stream mirror is connected, and the input terminal of second current mirror is connected to power supply through resistance element.
Further, the input terminal stream of first current mirror has the first electric current, the output end stream of first current mirror
There is the second electric current, the input terminal stream of second current mirror has third electric current, and the output end stream of second current mirror has the 4th
Electric current.
Further, first current mirror includes at least the first transistor and second transistor, second current mirror
Including at least third transistor and the 4th transistor.
Further, the resistance adjustment network includes digital logic level controller, resistive device and Digital Logic
Level control bus.
Further, the quantity of the digital logic level controller is at least one group, the digital logic level control
The digit of bus is at least one.
Further, the resistive device includes at least two resistance elements.
Further, the digital logic level controller includes input terminal and switching circuit, and the input terminal receives institute
Digital logic level control bus signal is stated, the switching circuit is connected with the resistive device.
Further, the switching circuit includes at least a transistor.
Further, first electric current, second electric current, the third electric current and the 4th electric current have ratio
Relationship.
Further, first electric current be reference current, the 4th electric current be output electric current, the bias current and
The proportionate relationship of the reference current can be adjusted by digital programmable.
Advantageous effects of the invention are as follows:
1, operational amplifier is introduced, using its empty short principle, auxiliary realizes that electric current accurately replicates；
2, it is controlled using digital logic level control bus, realizes that the wide scope of image current is adjustable.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
Fig. 1 is traditional passive bias current source circuit schematic diagram；
Fig. 2 is conventional active bias current source circuit schematic diagram；
Fig. 3 is the circuit diagram of a preferred embodiment of the invention.
Specific embodiment
The preferred embodiment of the present invention is introduced below with reference to Figure of description, keeps its technology contents more clear and convenient for reason
Solution.The present invention can be emerged from by many various forms of embodiments, and protection scope of the present invention is not limited only to text
In the embodiment mentioned.
As shown in figure 3, the digital regulated bias current sources of one of a preferred embodiment of the present invention, including the first electricity
Mirror, operational amplifier A0, resistance adjustment network, the second current mirror are flowed, the output end of first current mirror is through the resistance tune
To power vd D, the inverting input terminal of the operational amplifier A0 is connected with the output end of first current mirror for section network connection
It connects, the non-inverting input terminal of the operational amplifier A0 is connected with the input terminal of second current mirror, the operational amplifier
The output end of A0 is connected with the control terminal of second current mirror, and the input terminal of second current mirror is through resistance R4It is connected to
Power vd D.
The input terminal stream of first current mirror has the first electric current (i.e. reference current IREF), first current mirror it is defeated
Outlet stream has the second electric current (i.e. IR), the input terminal stream of second current mirror has third electric current (i.e. IR4), second electric current
The output end stream of mirror has the 4th electric current (i.e. output electric current IOUT)。
1, the effect of operational amplifier A0, this operational amplifier realize input using operational amplifier " empty short " principle
Hold the equal V of voltageN=VP, while the effect accurately adjusted is realized using the negative-feedback of operational amplifier.
2, resistance adjustment network, resistance adjustment network is by PMOS transistor P1, P2, resistance R1、R2、R3And Digital Logic
Level control bus B<1:0>composition adjusts resistance R by digital logic level control bus B<1:0>1、R2、R3Whether participate in
Achieve the purpose that realize that wide scope is adjusted to circuit work, as B<1:0>=00, equivalent resistance R=R3；As B<1:0>=01,
Then equivalent resistance R=R1+R3；As B<1:0>=10, then equivalent resistance R=R2+R3；As B<1:0>=11, then equivalent resistance R=R1
+R2+R3。
3, current-mirror structure forms the first electric current by NMOS transistor M0 (the first transistor) and M1 (second transistor)
Mirror, the size of M0 pipe are (W/L)M0, the size of M1 pipe is K* (W/L)M0, the ratio of the first current mirror isBy
NMOS transistor M2 (third transistor) and M3 (the 4th transistor) forms the second current mirror, and the size of M2 pipe is (W/L)M2, M3
The size of pipe is A* (W/L)M2, the ratio of the second current mirror is
Present invention utilizes resistance ratios and active biased mirroring ratios to devise the adjustable biasing of this wide scope number
Circuit.First current mirror of NMOS transistor M0 and M1 composition, the electric current of M1 pipe mirror image M0 pipeIt is assumed that the equivalent resistance of resistance adjustment network is R, then both ends equivalent resistance R
Voltage be VR=RIM1=RKIREF；
Since " empty short " effect of operational amplifier A0 makes VN=VP, so equivalent resistance is that R both end voltage is equal to R4Two
Hold voltage VR=VR4=RKIREF；
Flow through R4Electric current beFlow through R4Electric current be M2 pipe electric current IM2, NMOS crystal
Second current mirror of pipe M2 and M3 composition, the electric current of M3 pipe mirror image M2 pipe,
The electric current for flowing through M3 pipe is desired output electric current IOUT, so
Equivalent resistance has different value under different digital logic level control bus B<1:0>configuration, referring in particular under
Table:
| B<1:0> | R |
| 00 | R3 |
| 01 | R1+R3 |
| 10 | R2+R3 |
| 11 | R1+R2+R3 |
In conclusion the first electric current, that is, reference current IREF；Second electric current are as follows:
Third electric current are as follows:4th electric current exports electric current are as follows:
Therefore, first electric current, second electric current, the third electric current and the 4th electric current have proportionate relationship.
Bias current output appropriate can be obtained by the way that the value of current mirror ratio A and K is rationally arranged in the present invention, chooses not
Same R1、R2、R3And R4Ratio, obtain different bias currents.
The present invention realizes biased electrical using the digital control variation for realizing resistance ratio and the negative-feedback of operational amplifier
The wide scope on road is adjusted and is not designed with the high-precision bias current sources of mains voltage variations.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of digital regulated bias current sources, which is characterized in that including the first current mirror, operational amplifier, resistance adjustment net
The output end of network, the second current mirror, first current mirror is connected to the network through the resistance adjustment to power supply, the operation amplifier
The inverting input terminal of device is connected with the output end of first current mirror, the non-inverting input terminal of the operational amplifier with it is described
The input terminal of second current mirror is connected, and the output end of the operational amplifier is connected with the control terminal of second current mirror
It connects, the input terminal of second current mirror is connected to power supply through resistance element.
2. digital regulated bias current sources as described in claim 1, which is characterized in that the input terminal stream of first current mirror
There is the first electric current, the output end stream of first current mirror has the second electric current, and the input terminal stream of second current mirror has third
The output end stream of electric current, second current mirror has the 4th electric current.
3. digital regulated bias current sources as described in claim 1, which is characterized in that first current mirror includes at least the
One transistor and second transistor, second current mirror include at least third transistor and the 4th transistor.
4. digital regulated bias current sources as described in claim 1, which is characterized in that the resistance adjustment network includes number
Logic level controller, resistive device and digital logic level control bus.
5. digital regulated bias current sources as claimed in claim 4, which is characterized in that the digital logic level controller
Quantity is at least one group, and the digit of the digital logic level control bus is at least one.
6. digital regulated bias current sources as claimed in claim 4, which is characterized in that the resistive device includes at least two
A resistance element.
7. digital regulated bias current sources as claimed in claim 4, which is characterized in that the digital logic level controller packet
Include input terminal and switching circuit, the input terminal receives the digital logic level control bus signal, the switching circuit with
The resistive device is connected.
8. digital regulated bias current sources as claimed in claim 7, which is characterized in that it is brilliant that the switching circuit includes at least one
Body pipe.
9. digital regulated bias current sources as claimed in claim 2, which is characterized in that first electric current, second electricity
Stream, the third electric current and the 4th electric current have proportionate relationship.
10. digital regulated bias current sources as claimed in claim 9, which is characterized in that first electric current is reference current,
4th electric current is output electric current, and the electric current and the proportionate relationship of the reference current of exporting can be compiled by number
Journey is adjusted.
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| CN201910067645.XA CN109765963B (en) | 2019-01-24 | 2019-01-24 | Digital adjusting bias current source |
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|---|---|---|---|
| CN201910067645.XA CN109765963B (en) | 2019-01-24 | 2019-01-24 | Digital adjusting bias current source |
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| CN109765963B CN109765963B (en) | 2021-03-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113411055A (en) * | 2021-08-19 | 2021-09-17 | 深圳飞骧科技股份有限公司 | Bias current control device, radio frequency amplifier, electronic device and chip |
| CN113672026A (en) * | 2021-08-17 | 2021-11-19 | 晟合微电子(肇庆)有限公司 | MIPI's biasing circuit, MIPI module and display device |
| CN114578886A (en) * | 2022-05-06 | 2022-06-03 | 成都市安比科技有限公司 | Bias current programmable circuit |
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