CN103076838A - Current mirror and complementary bias method thereof - Google Patents
Current mirror and complementary bias method thereof Download PDFInfo
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- CN103076838A CN103076838A CN2012105874205A CN201210587420A CN103076838A CN 103076838 A CN103076838 A CN 103076838A CN 2012105874205 A CN2012105874205 A CN 2012105874205A CN 201210587420 A CN201210587420 A CN 201210587420A CN 103076838 A CN103076838 A CN 103076838A
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Abstract
The invention discloses a complementary bias method of a current mirror. The complementary bias method is used for biasing transistors in a current mirror circuit, wherein the total number of the transistors is even, emitter electrodes of the transistors are connected with a ground level, base electrodes of the transistors serve as current input terminals, and collector electrodes of the transistors serve as current output terminals. The complementary bias method comprises the following steps of: inputting a direct-current component to the current input terminal of each transistor in the current mirror circuit; selecting a first number of transistors from the current mirror circuit, wherein the first number is even; dividing the transistors of the first number into two parts according to a bisection manner; and inputting first alternating-current components to the base electrodes of the transistors of a first part of the transistors of the first number, and inputting second alternating-current components to the base electrodes of the transistors of a second part of the transistors of the first number, wherein the first alternating-current components and the second alternating-current components are equal in size and opposite in direction. Through the complementary bias method, the current output terminals can be enabled to obtain current higher than that in the prior art.
Description
Technical field
The application relates to the current mirroring circuit field, particularly the complementary biasing means of a kind of current mirror and a kind of current mirror.
Background technology
Current mirror is an important circuit unit of mimic channel, can be used for replica current, and it both can be used as bias unit and also can be used as Signal Processing Element, is widely used in the design of various simulations and radio circuit.
A Main Function of current mirror is to combine with reference source, biasing partly is provided for the Core Feature of mimic channel, provide tail current source such as the differential amplifier of doing load to resistance, the reference source of function admirable combines with current mirror, can be so that the quiescent point of mimic channel Core Feature part still keeps stable when temperature, supply voltage and technique change.
Existing current mirror is composed in parallel by the even number transistor, its biasing means is the DC component of transistorized base stage input in current mirror, the voltage of DC component is a fixed value, generally, be in the consideration of forward amplification region in order to satisfy transistor, transistorized base voltage is less than collector voltage, this just requires the voltage of DC component less, also just cause transistorized collector total current less, in the situation that needs the larger electric current of current mirror output, existing current mirror biasing means can not meet the demands.
Summary of the invention
In view of this, the embodiment of the present application provides the complementary biasing means of a kind of current mirror and a kind of current mirror, can make the larger electric current of transistorized collector output in the current mirror.
To achieve these goals, the technical scheme that provides of the application is as follows:
The complementary biasing means of a kind of current mirror, be used for the transistor of current mirroring circuit is setovered, described transistorized total quantity is even number, the described transistorized emitter of even number links to each other with ground level, the described transistorized base stage of even number is as current input terminal, the described transistorized collector of even number is as current output terminal, and described complementary biasing means comprises:
DC component of the current input terminal of all crystals pipe input in current mirroring circuit;
Select the first quantity transistor in the described current mirroring circuit, described the first quantity is even number;
With the first quantity transistor according to minute mode be divided into two parts;
The transistorized base stage input of first the first AC compounent in the described transistor of the first quantity;
The transistorized base stage input of second portion the second AC compounent in the described transistor of the first quantity, described the first AC compounent and the second AC compounent equal and opposite in direction, opposite direction.
Preferably, described the first quantity is less than total quantity.
Preferably, described the first quantity equals total quantity.
Preferably, described transistorized parameter is identical.
Preferably, described transistor is NPN transistor.
Preferably, described transistor is PNP transistor.
The embodiment of the present application also provides a kind of current mirror, and described current mirror comprises: transistor circuit, sorting circuit and biasing circuit, wherein:
Described transistor circuit comprises the even number transistor, and described transistorized base stage is as the input end of described current mirroring circuit, and described transistorized collector is as the output terminal of described transistor circuit, and described transistorized emitter links to each other with ground level;
Described sorting circuit is used for selecting described transistor circuit the first quantity transistor, and with the first quantity transistor according to the mode of dividing is divided into two parts, wherein, described the first quantity is even number;
Described biasing circuit is connected with described sorting circuit, is used for generating DC component and DC component is outputed to the first quantity transistorized base stage; And generate the first AC compounent and the second AC compounent, and described the first AC compounent outputed in the transistorized base stage of first, the second AC compounent is outputed in the transistorized base stage of second portion the first AC compounent and the second AC compounent equal and opposite in direction, opposite direction.
Preferably, described the second quantity is less than total quantity.
Preferably, described the second quantity equals total quantity.
Preferably, described transistorized parameter is identical.
As can be seen from the above technical solutions, compared with prior art, the complementary biasing means of the current mirror that the application provides is by increasing equal and opposite in direction in current mirroring circuit, the alternating current component of opposite direction, make transistorized input port component in the current mirror in the situation identical with existing biasing means, collector output total current is larger than the output current of existing biasing means, complementary biasing means is comparatively simple, and realize easily, the current mirror that the application provides can be inputted different AC compounent by sorting circuit with biasing circuit in current mirror module, thereby can obtain larger output current.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The schematic flow sheet of the complementary biasing means of a kind of current mirror that Fig. 1 provides for the embodiment of the present application;
Transistorized connection diagram in a kind of current mirror that Fig. 2 provides for the embodiment of the present application;
Transistorized connection diagram in the another kind of current mirror that Fig. 3 provides for the embodiment of the present application;
The electrical block diagram of a kind of current mirror that Fig. 4 provides for the embodiment of the present application.
Embodiment
In order to make those skilled in the art person understand better technical scheme among the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
Embodiment one:
The schematic flow sheet of the complementary biasing means of a kind of current mirror that Fig. 1 provides for the embodiment of the present application.
The method is applied in the current mirroring circuit, and transistorized total quantity is even number in this circuit, and the emitter of all crystals pipe links to each other with ground level, and the base stage of all crystals pipe is as current input terminal, and the collector of all crystals pipe is as current output terminal.
As shown in Figure 1, this complementation biasing means comprises:
S100, in current mirroring circuit DC component of current input terminal input of all crystals pipe.
The current input terminal of all crystals pipe in the current mirroring circuit can connect a dc constant current power supply, and this dc constant current power supply can generate a DC component, namely all inputs an identical DC component on the base stage of all crystals pipe.
The first quantity transistor in S200, the selection current mirroring circuit.
Compare with existing method for the current average of the current input terminal that makes all crystals pipe and to be unlikely to change, this first quantity is even number, and this first quantity can less than total quantity, also can equal total quantity.
S300, with the first quantity transistor according to minute mode be divided into two parts.
S400, in the first quantity transistor the transistorized base stage of first input the first AC compounent.
S500, in the first quantity transistor the transistorized base stage of second portion input the second AC compounent.
Above-mentioned the first AC compounent and the second AC compounent are equal and opposite in directions, the AC compounent of opposite direction, in actual applications, can produce a benchmark AC compounent by an ac current source, in first's this benchmark AC compounent of transistorized base stage input, this benchmark AC compounent namely is the second AC compounent after can changing the direction of this benchmark AC compounent through a phase inverter, this second AC compounent is input in the transistorized base stage of second portion, in addition, the transistorized base stage of two parts can also link to each other with two ac current sources respectively, these two ac current sources can generate two equal and opposite in directions, and the AC compounent of opposite direction, in actual applications, the first AC compounent and the second AC compounent can be produced by the inside of current mirror place side circuit, for example the output by oscillator provides, so just can in side circuit, not produce a signal source, on the not impact of output of integrated circuit.
As can be seen from the above technical solutions, the complementary biasing means of the current mirror that the embodiment of the present application provides is by increasing the AC compounent of equal and opposite in direction, opposite direction in current mirroring circuit, make transistorized input port component in the current mirror in the situation identical with existing biasing means, collector output total current is larger than the output current of existing biasing means, this complementation biasing means is comparatively simple, and realize easily, by the different AC compounent of input in transistor, thereby can obtain larger output current.
Below in conjunction with concrete case the method that the embodiment of the present application provides is described in detail:
Transistorized connection diagram in a kind of current mirror that Fig. 2 provides for the embodiment of the present application, wherein, the integrated connection situation of current mirror is with existing consistent, transistorized quantity is m, m is made as even number, the transistorized emitter of even number links to each other with ground level, the transistorized base stage of even number is as current input terminal, the transistorized collector of even number is as current output terminal, and in DC component of current input terminal input, transistor can be NPN transistor, it also can be the PNP transistor, for sake of convenience, in the embodiment of the present application, transistor is NPN transistor.
As shown in Figure 2, m is the quantity of transistor parallel connection, and establishing m here is even number, in existing biasing means, all only inputs a DC component V m transistorized base stage
0, i.e. V
B=V
0, can obtain thus m transistorized collector total current i
C, 1For:
In the formula, I
SBe collector reverse saturation current, V
TBe thermal voltage.
Fig. 3 is transistorized connection diagram in the another kind of current mirror that provides of the embodiment of the present application.
As shown in Figure 3, the integrated connection situation of current mirror is with existing consistent, and transistorized quantity is m, m is made as even number, the transistorized emitter of even number links to each other with ground level, and the transistorized base stage of even number is as current input terminal, and the transistorized collector of even number is as current output terminal, in DC component of current input terminal input, transistor can be NPN transistor, also can be the PNP transistor, for sake of convenience, in the embodiment of the present application, transistor is NPN transistor.
In the process of the transistor in the current mirroring circuit being carried out complementary biasing, select first the first quantity transistor, if transistorized total quantity is two, then choose two transistors and carry out the complementation biasing, if transistorized quantity is the even number greater than two, can select all transistors to carry out the complementation biasing, also can therefrom choose 2,4,6 or more even number transistor.
Get afterwards the transistor of half quantity in the first quantity transistor, also input the first AC compounent Acos (ω t+ φ) in its base stage, new electric current is V
BP, i.e. V
BP=V
0+ Acos (ω t+ φ) is in transistorized base stage input second AC compounent of other half quantity of the first quantity transistor
New input current is V
BN, i.e. V
BN=V
0-Acos (ω t+ φ), the port V that namely connects in transistorized base stage
BPAnd V
BNUpper except DC component V of input
0, the first AC compounent and the second AC compounent have also been increased outward, equal and opposite in direction, the opposite direction of the first AC compounent and the second AC compounent.
In actual applications, the first AC compounent and the second AC compounent can be produced by the inside of side circuit, for example the output by oscillator provides, so just can in side circuit, not produce a signal source, on not impact of the output of integrated circuit, and, apply the first AC compounent and the second AC compounent after, because equal and opposite in direction, the opposite direction of two AC compounent, the current average of the input of the base stage of current mirror all crystals pipe still is V
0, identical with transistorized base stage input in the existing biasing means, in addition, the base voltage of all crystals pipe is less than collector voltage, makes the transistor in the circuit be in the forward workspace, i.e. and forward bias is become in emission, and current collection is become reverse bias.
In the embodiment of the present application, for sake of convenience, the first quantity can be n transistor, n is even number, and the first quantity can also can equal total quantity, i.e. n≤m less than total quantity, behind n transistorized base stage difference input AC component, the total current of collector can be expressed as:
For checking conveniently, in the embodiment of the present application, get n=m, then (2) formula can be expressed as again:
In (1) formula substitution (3) formula, then the total current of transistor collector can be expressed as again:
Utilize following Taylor expansion formula, (4) formula launched,
Can be shown below after the expansion:
Can be found out that by (6) formula always the collector total current than the tradition biasing is large for the collector total current that is obtained by complementary biasing means, i.e. i
C, 2I
C, 1
Above-mentioned is to have chosen in the current mirroring circuit all transistors to carry out the complementation biasing, when a selection part is wherein carried out the complementation biasing, because the transistorized collector current that is not selected and the transistorized collector current of the equivalent amount in the classic method equate, and the transistorized collector current that carries out complementary biasing is greater than traditional biasing means, therefore, the selected part transistor carries out the complementation biasing, and the collector total current that obtains also is greater than classic method.
The embodiment of the present application also provides a kind of current mirror, the electrical block diagram of a kind of current mirror that Fig. 4 provides for the embodiment of the present application, and as shown in Figure 4, this current mirror comprises: transistor circuit 1, sorting circuit 2 and biasing circuit 3, wherein:
Transistor circuit 1 comprises the even number transistor, i.e. m transistor, and the base stage of all crystals pipe is as the input end of current mirroring circuit, and the collector of all crystals pipe is as the output terminal of transistor circuit, and the emitter of all crystals pipe links to each other with ground level;
Sorting circuit 2 is used for selecting transistor circuit the first quantity transistor, and with the first quantity transistor according to minute mode be divided into two parts, wherein, the first quantity is even number, in actual applications, sorting circuit can be the multistage wire that is connected from different transistorized base stages, can select different transistors by connecting different wires;
Biasing circuit 3 is connected with sorting circuit, is used for generating DC component and DC component is outputed to the first quantity transistorized base stage; And generate the first AC compounent and the second AC compounent, and the first AC compounent is outputed in the transistorized base stage of first, namely be input to V
BPIn, the second AC compounent is outputed in the transistorized base stage of second portion, namely be input to V
BNIn, the first AC compounent and the second AC compounent equal and opposite in direction, opposite direction, in actual applications, current mirroring circuit generally is connected in other circuit, and biasing circuit just can be the circuit that can produce DC component and different AC compounent.
In above-mentioned current mirror, the second quantity can also can equal total quantity less than total quantity, and principle is consistent among the concrete checking computations process and method embodiment, repeats no more here.
The current mirror that the application provides can be inputted different AC compounent by sorting circuit with biasing circuit in transistor, thereby can obtain larger output current.
Need to prove, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.Do not having in the situation of more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Need to prove, the above only is a part of preferred embodiment of present techniques scheme, make those skilled in the art can fully understand or realize the application, rather than whole embodiment, General Principle as defined herein can in the situation of the spirit or scope that do not break away from the application, realize in other embodiments.Therefore; based on above embodiment; for those skilled in the art; do not break away from the application's principle, do not making under the creative work prerequisite, can also make multiple apparent modification and retouching; the every other embodiment that obtains by these modifications and retouching; can be applied to the present techniques scheme, these do not affect the application's realization, all should belong to the application's protection domain.Therefore, the application will can not be restricted to these embodiment shown in this article, but will accord with principle disclosed herein and features of novelty the widest consistent scope.
More than the application is described in detail, but using specific case herein sets forth the application's principle and embodiment, the explanation of above embodiment just is used for helping to understand the application's method and core concept thereof, simultaneously, for one of ordinary skill in the art, the thought according to the application all will change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the application.
Claims (10)
1. the complementary biasing means of a current mirror, be used for the transistor of current mirroring circuit is setovered, it is characterized in that, described transistorized total quantity is even number, the described transistorized emitter of even number links to each other with ground level, the described transistorized base stage of even number is as current input terminal, and the described transistorized collector of even number is as current output terminal, and described complementary biasing means comprises:
DC component of the current input terminal of all crystals pipe input in current mirroring circuit;
Select the first quantity transistor in the described current mirroring circuit, described the first quantity is even number;
With the first quantity transistor according to minute mode be divided into two parts;
The transistorized base stage input of first the first AC compounent in the described transistor of the first quantity;
The transistorized base stage input of second portion the second AC compounent in the described transistor of the first quantity, described the first AC compounent and the second AC compounent equal and opposite in direction, opposite direction.
2. method according to claim 1 is characterized in that, described the first quantity is less than total quantity.
3. method according to claim 1 is characterized in that, described the first quantity equals total quantity.
4. method according to claim 1 is characterized in that, described transistorized parameter is identical.
5. method according to claim 1 is characterized in that, described transistor is NPN transistor.
6. method according to claim 1 is characterized in that, described transistor is PNP transistor.
7. a current mirror is characterized in that, described current mirror comprises: transistor circuit, sorting circuit and biasing circuit, wherein:
Described transistor circuit comprises the even number transistor, and described transistorized base stage is as the input end of described current mirroring circuit, and described transistorized collector is as the output terminal of described transistor circuit, and described transistorized emitter links to each other with ground level;
Described sorting circuit is used for selecting described transistor circuit the first quantity transistor, and with the first quantity transistor according to the mode of dividing is divided into two parts, wherein, described the first quantity is even number;
Described biasing circuit is connected with described sorting circuit, is used for generating DC component and DC component is outputed to the first quantity transistorized base stage; And generate the first AC compounent and the second AC compounent, and described the first AC compounent outputed in the transistorized base stage of first, the second AC compounent is outputed in the transistorized base stage of second portion the first AC compounent and the second AC compounent equal and opposite in direction, opposite direction.
8. current mirror according to claim 7 is characterized in that, described the second quantity is less than total quantity.
9. current mirror according to claim 7 is characterized in that, described the second quantity equals total quantity.
10. according to claim 8 or 9 each described current mirrors, it is characterized in that described transistorized parameter is identical.
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| CN201210587420.5A CN103076838B (en) | 2012-12-28 | 2012-12-28 | Current mirror and complementary bias method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6489827B1 (en) * | 2000-10-30 | 2002-12-03 | Marvell International, Ltd. | Reduction of offset voltage in current mirror circuit |
| CN201035440Y (en) * | 2007-03-31 | 2008-03-12 | 华为技术有限公司 | Current mirror |
| US20100026376A1 (en) * | 2008-07-31 | 2010-02-04 | International Business Machines Corporation | Bias circuit for a mos device |
| WO2012082189A1 (en) * | 2010-12-16 | 2012-06-21 | Xilinx, Inc. | Current mirror and high-compliance single-stage amplifier |
| CN202306379U (en) * | 2011-11-02 | 2012-07-04 | 国民技术股份有限公司 | Current mirroring circuit |
-
2012
- 2012-12-28 CN CN201210587420.5A patent/CN103076838B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6489827B1 (en) * | 2000-10-30 | 2002-12-03 | Marvell International, Ltd. | Reduction of offset voltage in current mirror circuit |
| CN201035440Y (en) * | 2007-03-31 | 2008-03-12 | 华为技术有限公司 | Current mirror |
| US20100026376A1 (en) * | 2008-07-31 | 2010-02-04 | International Business Machines Corporation | Bias circuit for a mos device |
| WO2012082189A1 (en) * | 2010-12-16 | 2012-06-21 | Xilinx, Inc. | Current mirror and high-compliance single-stage amplifier |
| CN202306379U (en) * | 2011-11-02 | 2012-07-04 | 国民技术股份有限公司 | Current mirroring circuit |
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