JPH05108182A - Current mirror circuit - Google Patents

Current mirror circuit

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Publication number
JPH05108182A
JPH05108182A JP26456591A JP26456591A JPH05108182A JP H05108182 A JPH05108182 A JP H05108182A JP 26456591 A JP26456591 A JP 26456591A JP 26456591 A JP26456591 A JP 26456591A JP H05108182 A JPH05108182 A JP H05108182A
Authority
JP
Japan
Prior art keywords
voltage
current mirror
collector
current
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP26456591A
Other languages
Japanese (ja)
Inventor
Haruyoshi Katagiri
晴義 片桐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP26456591A priority Critical patent/JPH05108182A/en
Publication of JPH05108182A publication Critical patent/JPH05108182A/en
Withdrawn legal-status Critical Current

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Abstract

PURPOSE:To obtain a current mirror circuit capable of keeping output current constant even when power source voltage or the voltage falling voltage of a load circuit is changed. CONSTITUTION:The collector voltage of an output side current mirror TR 3 is detected by a voltage detection TR 5 and the detection voltage is fed back to the collector of an input side current mirror TR 2 by a voltage feedback TR 6. Thus, the voltage between the base and collector of the TR 2 gets equal to that between the base and collector of the TR 3 and therefore, the constant output current can be always obtained while not being affected by the change of power supply voltage Vcc and the voltage falling voltage of a load circuit 4.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、入力電流に応じた一定
の電流を出力する電流ミラー回路に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current mirror circuit which outputs a constant current according to an input current.

【0002】[0002]

【従来の技術】図2は、従来の電流ミラー回路の一構成
例を示す回路図である。
2. Description of the Related Art FIG. 2 is a circuit diagram showing a configuration example of a conventional current mirror circuit.

【0003】この電流ミラー回路は、回路の+側電源電
圧Vccに接続された定電流源1を有し、その定電流源1
には、入力側電流ミラー用のNPN型トランジスタ(以
下、TRという)2のベース及びコレクタと、出力側電
流ミラー用のNPN型TR3のベースとが接続されてい
る。各TR2,3のエミッタが−側電源電圧Vccに接続
され、そのTR3のコレクタが負荷回路4に接続されて
いる。
This current mirror circuit has a constant current source 1 connected to the + side power supply voltage Vcc of the circuit.
A base and a collector of an NPN transistor (hereinafter referred to as TR) 2 for an input side current mirror and a base of an NPN type TR3 for an output side current mirror are connected to. The emitter of each TR2,3 is - connected to the side supply voltage V cc, the collector of the TR3 is connected to the load circuit 4.

【0004】この電流ミラー回路は、定電流源1の電流
inを、コレクタ・ベース間を短絡した入力側電流ミラ
ーTR2のコレクタ側へ印加し、そのコレクタ及びベー
スを出力側電流ミラーTR3のベースに接続しているの
で、定電流源1の電流Iinに応じた一定の電流を出力側
電流ミラーTR3のコレクタから出力できる。
This current mirror circuit applies the current I in of the constant current source 1 to the collector side of an input side current mirror TR2 whose collector and base are short-circuited, and its collector and base are applied to the base of an output side current mirror TR3. Therefore, a constant current corresponding to the current I in of the constant current source 1 can be output from the collector of the output side current mirror TR3.

【0005】この電流ミラー回路において、各TR2,
3のコレクタ電流をそれぞれIc2,Ic3、電流増幅率を
それぞれhfe2 ,hfe3 、ベース・エミッタ間電圧をそ
れぞれVbe2 ,Vbe3 、ベース・コレクタ間電圧をそれ
ぞれVcb2 ,Vcb3 、エミッタ・コレクタ間電圧をそれ
ぞれVce2 ,Vce3 、アーリー(Early)電圧をそ
れぞれVa2,Va3、飽和電流をそれぞれIs2,Is3とす
る。また、各TR2,3の特性は各々等しいとして、h
fe2 =hfe3 =hfe、Va2=Va3=Va 、Is2=Is3
s とすると、次式が成立する。
In this current mirror circuit, each TR2,
3 collector currents I c2 and I c3 , current amplification factors h fe2 and h fe3 , base-emitter voltages V be2 and V be3 , base-collector voltages V cb2 and V cb3 , and emitter, respectively. The collector voltages are V ce2 and V ce3 , the Early voltages are V a2 and V a3 , and the saturation currents are I s2 and I s3 , respectively. Further, assuming that the characteristics of the TRs 2 and 3 are equal, h
fe2 = h fe3 = h fe , V a2 = V a3 = V a , I s2 = I s3 =
Let I s be:

【0006】[0006]

【数1】 [Equation 1]

【0007】通常、hfe≫1のため、(1)式は次式で
示される。 Ic2≒Iin ・・・(2) また、TR特性の一般式より、次式でも表わすことがで
きる。
Normally, since h fe >> 1, equation (1) is expressed by the following equation. I c2 ≈I in (2) Further, from the general expression of the TR characteristic, it can be expressed by the following expression.

【0008】[0008]

【数2】 [Equation 2]

【0009】(3),(4)式中のVt は、Vt =(k
/q)・Tであり、kはボルツマン定数、qは電子の電
荷、Tは絶対温度であり、温度が一定ならば、このVt
が一定値となる。さらに、(3)式を変形してVbe2
表わすと、次式が得られる。
V t in the equations (3) and (4) is V t = (k
/ Q) · T, k is the Boltzmann constant, q is the charge of the electron, T is the absolute temperature, and if the temperature is constant, this V t
Is a constant value. Further, when the expression (3) is modified and expressed by V be2 , the following expression is obtained.

【0010】[0010]

【数3】 [Equation 3]

【0011】また、TR2,3のベースが共通接続され
ているため、ベース・エミッタ間電圧がVbe3 =Vbe2
となり、(4)式のVbe3 に(5)式を代入すると、I
c3は次式で示される。
Since the bases of TR2 and TR3 are commonly connected, the base-emitter voltage is V be3 = V be2
Then, substituting equation (5) for V be3 in equation (4), I
c3 is shown by the following equation.

【0012】[0012]

【数4】 [Equation 4]

【0013】[0013]

【発明が解決しようとする課題】しかしながら、従来の
電流ミラー回路では、次のような課題があった。従来の
電流ミラー回路のコレクタ電流(出力電流)Ic3は、V
cb2 =Vcb3 であれば、(6)式より、Ic3=Iinとな
り、定電流源1の電流値と等しい理想的な出力電流が得
られる。ところが、この電流ミラー回路のVcb2 とV
cb3 は、TR3の負荷回路4の電圧降下電圧をVL とす
ると、次式(7),(8)が得られる。 Vcb2 =Vce2 −Vbe2 ・・・(7) Vcb3 =Vce3 −Vbe3 =Vcc−VL −Vbe3 ・・・(8) TR2は、コレクタ・ベース間が短絡されているので、
ce2 =Vbe2 となり、またTR2とTR3のベースが
共通接続されているため、Vbe2 =Vbe3 =Vbeとする
と、(7),(8)式は次式(9),(10)で示され
る。 Vcb2 =0 ・・・(9) Vcb3 =Vcc−VL −Vbe ・・・(10) この(9),(10)式から明らかのように、回路の電
源電圧VccがVcc=VL +Vbeの条件が満たされたとき
のみ、Vcb2 =Vcb3 となり、コレクタ電流(出力電
流)がIc3=Iinとなる。また、(9),(10)式を
(6)式に代入すると、次式(11)が得られる。
However, the conventional current mirror circuit has the following problems. The collector current (output current) I c3 of the conventional current mirror circuit is V
If cb2 = V cb3 , from the equation (6), I c3 = I in , and an ideal output current equal to the current value of the constant current source 1 can be obtained. However, V cb2 and V of this current mirror circuit
When the voltage drop voltage of the load circuit 4 of TR3 is set to V L , cb3 obtains the following equations (7) and (8). V cb2 = V ce2 -V be2 ··· (7) V cb3 = V ce3 -V be3 = V cc -V L -V be3 ··· (8) TR2 is, because between the collector and base are short-circuited ,
Since V ce2 = V be2 and the bases of TR2 and TR3 are commonly connected, assuming that V be2 = V be3 = V be , equations (7) and (8) are given by the following equations (9) and (10). Indicated by. V cb2 = 0 (9) V cb3 = V cc -V L -V be (10) As is apparent from the equations (9) and (10), the power supply voltage V cc of the circuit is V V cb2 = V cb3 and the collector current (output current) becomes I c3 = I in only when the condition of cc = V L + V be is satisfied. Further, by substituting the expressions (9) and (10) into the expression (6), the following expression (11) is obtained.

【0014】[0014]

【数5】 [Equation 5]

【0015】(11)式から明らのなように、この電流
ミラー回路を用いると、コレクタ電流(出力電流)Ic3
は電源電圧Vccの電圧上昇に伴ない増加する。通常、ア
ーリー電圧Va は50V位であり、例えばこの電流ミラ
ー回路で電源電圧Vcc=5Vで用いたときと、20Vで
用いたときとでは、コレクタ電流(出力電流)Ic3は1
5V/50Vの差があり、30%も変わってしまうこと
になる。特に、オペアンプ等といった広範囲の電源電圧
ccを用いる用途、あるいは負荷回路4の電圧降下電圧
L が異なる用途に対し、コレクタ電流(出力電流)I
c3が大きく変わってしまうという問題があり、それを解
決することが困難であった。
As is apparent from the equation (11), when this current mirror circuit is used, the collector current (output current) I c3
Increases as the power supply voltage Vcc increases. Normally, the early voltage V a is about 50 V, and for example, the collector current (output current) I c3 is 1 when the power supply voltage V cc = 5 V is used in this current mirror circuit and when it is used at 20 V.
There is a difference of 5V / 50V, which means 30% change. In particular, the collector current (output current) I is used for applications using a wide range of power supply voltage V cc such as operational amplifiers or applications in which the voltage drop voltage V L of the load circuit 4 is different.
There was a problem that c3 changed greatly, and it was difficult to solve it.

【0016】本発明は、前記従来技術が持っていた課題
として、電源電圧Vccの変化や、負荷回路の電圧降下電
圧が変わると、出力電流が大きく変わってしまうという
点について解決した電流ミラー回路を提供するものであ
る。
The present invention solves the problem of the prior art that the output current greatly changes when the power supply voltage V cc changes or the voltage drop voltage of the load circuit changes. Is provided.

【0017】[0017]

【課題を解決するための手段】第1の発明は、前記課題
を解決するために、ベースが共通接続された入力側電流
ミラーTR及び出力側電流ミラーTRを有し、前記入力
側電流ミラーTRのコレクタに流れる入力電流に応じた
一定の電流を前記出力側電流ミラーTRのコレクタから
出力する電流ミラー回路において、前記出力側電流ミラ
ーTRのコレクタ電圧を検出する電圧検出手段と、前記
電圧検出手段で検出した電圧を前記入力側電流ミラーT
Rのコレクタへ帰還する電圧帰還手段とを、設けてい
る。
In order to solve the above-mentioned problems, a first invention has an input-side current mirror TR and an output-side current mirror TR whose bases are commonly connected, and the input-side current mirror TR is provided. In the current mirror circuit for outputting a constant current corresponding to the input current flowing through the collector of the output side current mirror TR from the collector of the output side current mirror TR, voltage detecting means for detecting the collector voltage of the output side current mirror TR, and the voltage detecting means. The voltage detected by the input side current mirror T
And a voltage feedback means for returning to the collector of R.

【0018】第2の発明では、第1の発明の電圧検出手
段及び電圧帰還手段をそれぞれトランジスタで構成して
いる。
According to a second aspect of the invention, the voltage detecting means and the voltage feedback means of the first aspect are each composed of a transistor.

【0019】[0019]

【作用】第1の発明によれば、以上のように電流ミラー
回路を構成したので、出力側電流ミラーTRのコレクタ
電圧は、電圧検出手段によって電圧帰還手段へ伝えら
れ、該電圧帰還手段によって入力側電流ミラーTRのコ
レクタへ帰還される。これにより、入力側電流ミラーT
Rのコレクタ電圧は、出力側電流ミラーTRのコレクタ
電圧と等しくなり、回路の電源電圧の変化や、負荷回路
の電圧降下電圧が変わっても、出力側電流ミラーTRの
出力電流を一定に保てる。
According to the first aspect of the invention, since the current mirror circuit is configured as described above, the collector voltage of the output side current mirror TR is transmitted to the voltage feedback means by the voltage detection means and input by the voltage feedback means. It is fed back to the collector of the side current mirror TR. As a result, the input side current mirror T
The collector voltage of R becomes equal to the collector voltage of the output side current mirror TR, and the output current of the output side current mirror TR can be kept constant even if the power supply voltage of the circuit changes or the voltage drop voltage of the load circuit changes.

【0020】第2の発明では、出力側電流ミラーTRの
コレクタ電圧が電圧検出用のトランジスタで検出され、
その検出電圧が電圧帰還用のTRを介して入力側電流ミ
ラーTRのコレクタへ帰還される。従って、前記課題を
解決できるのである。
In the second aspect of the invention, the collector voltage of the output side current mirror TR is detected by the voltage detecting transistor,
The detected voltage is fed back to the collector of the input side current mirror TR via the voltage feedback TR. Therefore, the above problem can be solved.

【0021】[0021]

【実施例】図1は、本発明の実施例を示す電流ミラー回
路の回路図であり、従来の図2中の要素と共通の要素に
は共通の符号が付されている。この電流ミラー回路で
は、従来の電流ミラー回路に、出力側電流ミラーTR3
のコレクタ電圧を検出する電圧検出手段(例えば、電圧
検出用のNPN型TR)5と、該TR5で検出された電
圧を入力側電流ミラーTR2のコレクタへ帰還する電圧
帰還手段(例えば、電圧帰還用のPNP型TR)6とが
付加されている。さらに、電圧検出用TR5のバイアス
電流供給用のバイアス用抵抗7が設けられている。
FIG. 1 is a circuit diagram of a current mirror circuit showing an embodiment of the present invention, in which elements common to those in FIG. 2 of the prior art are designated by common reference numerals. In this current mirror circuit, the output current mirror TR3 is added to the conventional current mirror circuit.
Voltage detecting means (for example, NPN type TR for voltage detection) 5 for detecting the collector voltage of the input terminal and voltage feedback means (for example, for voltage feedback) for returning the voltage detected by the TR5 to the collector of the input side current mirror TR2. PNP type TR) 6 of Further, a bias resistor 7 for supplying a bias current of the voltage detecting TR5 is provided.

【0022】即ち、この電流ミラー回路では、定電流源
1が、入力側電流ミラーTR2のコレクタ及び電圧帰還
用のTR6のエミッタに接続されている。電圧帰還用T
R6のコレクタは、ベースが共通接続された入力側電流
ミラーTR2及び出力側電流ミラーTR3のベースに接
続され、そのTR2,3にベース電流を供給している。
電圧検出用TR5のベースは、出力側電流ミラーTR3
のコレクタに接続され、該TR5のコレクタが電源電圧
ccに接続されている。TR5のエミッタは、TR6の
ベース及びバイアス用抵抗7に接続されている。
That is, in this current mirror circuit, the constant current source 1 is connected to the collector of the input side current mirror TR2 and the emitter of TR6 for voltage feedback. Voltage feedback T
The collector of R6 is connected to the bases of an input side current mirror TR2 and an output side current mirror TR3 whose bases are commonly connected, and supplies a base current to TR2 and TR3.
The base of the voltage detection TR5 is the output side current mirror TR3.
, And the collector of the TR5 is connected to the power supply voltage V cc . The emitter of TR5 is connected to the base of TR6 and the bias resistor 7.

【0023】この電流ミラー回路では、出力側電流ミラ
ーTR3のコレクタ電圧が、電圧検出用TR5のエミッ
タに伝えられ、その電圧が、電圧帰還用TR6を介して
入力側電流ミラーTR2のコレクタへ帰還される。これ
により、入力側電流ミラーTR2のコレクタ電圧は、出
力側電流ミラーTR3のコレクタ電圧と等しくなる。こ
の電流ミラー回路において、各TR5,6のベース・エ
ミッタ間電圧をそれぞれVbe5 ,Vbe6 とし、他の回路
素子が従来の図2のものと同様であるとすると、電流ミ
ラーTR2,3のベース・コレクタ電圧Vcbは、次式
(12),(13)で示される。 Vcb3 =Vcc−VL −Vbe3 ・・・(12) Vcb2 =Vcc−VL −Vbe5 +Vbe6 −Vbe2 ・・・(13) ここで、電流ミラーTR2と3のベースが相互に接続さ
れているため、Vbe2 =Vbe3 =Vbeとし、またTR5
のVbe5 及びTR6のVbe6 もおよそ0.7V程度で等
しいため、(12),(13)式は次式で示される。 Vcb3 =Vcc−VL −Vbe ・・・(14) Vcb2 =Vcc−VL −Vbe ・・・(15) (14),(15)式を(6)式に代入すると、出力側
電流ミラーTR3のコレクタ電流(出力電流)Ic3は、
次式(16)のように表わせる。
In this current mirror circuit, the collector voltage of the output side current mirror TR3 is transmitted to the emitter of the voltage detecting TR5, and the voltage is fed back to the collector of the input side current mirror TR2 via the voltage feedback TR6. It As a result, the collector voltage of the input side current mirror TR2 becomes equal to the collector voltage of the output side current mirror TR3. In this current mirror circuit, assuming that the base-emitter voltages of the TRs 5 and 6 are V be5 and V be6 , respectively, and the other circuit elements are the same as those of the conventional one shown in FIG. 2, the bases of the current mirrors TR2 and TR3. The collector voltage V cb is expressed by the following equations (12) and (13). V cb3 = V cc -V L -V be3 ··· (12) V cb2 = V cc -V L -V be5 + V be6 -V be2 ··· (13) , where the base of the current mirror TR2 and 3 Since they are connected to each other, V be2 = V be3 = V be, and TR5
V be5 of TR6 and V be6 of TR6 are equal to each other at about 0.7 V, and therefore, equations (12) and (13) are expressed by the following equations. V cb3 = V cc -V L -V be ··· (14) V cb2 = V cc -V L -V be ··· (15) (14), are substituted into the expression (6) (15) , The collector current (output current) I c3 of the output side current mirror TR3 is
It can be expressed as the following equation (16).

【0024】[0024]

【数6】 [Equation 6]

【0025】従来の回路でのコレクタ電流(出力電流)
c3の(11)式と前記(16)式を比べれば明らかの
ように、本実施例の回路でのコレクタ電流(出力電流)
c3は、電源電圧Vccや、負荷回路4の電圧降下電圧V
L に影響されずに、コレクタ電流(入力電流)Iinに応
じた一定の電流を出力することができる。
Collector current (output current) in a conventional circuit
As is clear by comparing the equation (11) of I c3 with the equation (16), the collector current (output current) in the circuit of this embodiment is as follows.
I c3 is the power supply voltage V cc or the voltage drop voltage V of the load circuit 4.
It is possible to output a constant current according to the collector current (input current) I in without being affected by L.

【0026】即ち、電流ミラーTR2と3の特性を同一
にすることにより、電流Iinと同一の電流値のコレクタ
電流Ic3、あるいは該TR2と3の特性を変えることに
より、電流Iinを定数倍したコレクタ電流Ic3を出力す
ることが可能となる。
[0026] That is, by the current mirror TR2 3 properties of the same, by changing the characteristics of the collector current I c3 or the TR2 and 3, the same current value and the current I in, the current I in the constant It is possible to output the doubled collector current I c3 .

【0027】図3は、従来と本実施例との電源電圧Vcc
に対するコレクタ電流(出力電流)Ic3の特性図であ
る。この図から明らかなように、従来の特性11では、
出力電流が電源電圧Vccの上昇に伴ない増加するが、本
実施例の特性12では、電源電圧Vccが変わっても常に
一定の出力電流が得られることがわかる。従って、広範
囲な電源電圧Vccで電流ミラー回路を用いる場合、該電
源電圧Vccによる出力電流の変動のない、入力電流のみ
に応じた一定の出力電流が簡単な回路構成で、精度よく
得られる。
FIG. 3 shows the power supply voltage V cc of the prior art and this embodiment.
It is a characteristic view of the collector current (output current) I c3 with respect to. As is apparent from this figure, in the conventional characteristic 11,
Although the output current increases as the power supply voltage V cc increases, it can be seen from the characteristic 12 of this embodiment that a constant output current can always be obtained even if the power supply voltage V cc changes. Therefore, when the current mirror circuit is used with a wide range of power supply voltage Vcc , a constant output current corresponding to only the input current without fluctuation of the output current due to the power supply voltage Vcc can be accurately obtained with a simple circuit configuration. ..

【0028】なお、本発明は上記実施例に限定されず、
種々変形が可能である。その変形例としては、例えば次
のようなものがある。 (a) 図1では、電流ミラーTR2,3をNPN型ト
ランジスタで構成したが、それらをPNP型トランジス
タ等といった他のトランジスタで構成してもよい。この
際、それに応じて電源電圧Vccの極性を変えればよい。
The present invention is not limited to the above embodiment,
Various modifications are possible. Examples of such modifications include the following. (A) In FIG. 1, the current mirrors TR2 and TR3 are composed of NPN type transistors, but they may be composed of other transistors such as PNP type transistors. At this time, the polarity of the power supply voltage Vcc may be changed accordingly.

【0029】(b) 電圧検出用TR5は、NPN型ト
ランジスタで構成したが、これをPNP型トランジスタ
やFET(電界効果トランジスタ)等とった他のトラン
ジスタ等で構成してもよい。同様に、電圧帰還用TR6
は、PNP型トランジスタで構成したが、これをNPN
型トランジスタやFETのような他のトランジスタ等で
構成してもよい。この際、これらの素子構造の変更に伴
ない、電源電圧Vccの極性や、バイアス用抵抗7等の回
路素子の接続関係をそれに応じて変更すればよい。
(B) Although the voltage detecting TR5 is composed of an NPN type transistor, it may be composed of another transistor such as a PNP type transistor or FET (field effect transistor). Similarly, TR6 for voltage feedback
Consisted of a PNP type transistor.
It may be configured by another transistor such as a mold transistor or FET. At this time, the polarity of the power supply voltage V cc and the connection relationship of the circuit elements such as the bias resistor 7 may be changed according to the change in the element structure.

【0030】[0030]

【発明の効果】以上詳細に説明したように、第1の発明
によれば、出力側電流ミラーTRのコレクタ電圧を電圧
検出手段で検出し、その検出電圧を電圧帰還手段を介し
て入力側電流ミラーTRのコレクタに帰還するようにし
たので、該入力側電流ミラーTRのコレクタ電圧が出力
側電流ミラーTRのコレクタ電圧と等しくなる。そのた
め、回路の電源電圧の変化や、負荷回路の電圧降下電圧
の影響を受けずに、入力電流に応じた常に一定の出力電
流が、比較的簡単な回路構成で、的確に得られる。従っ
て、例えば広範囲な回路の電源電圧で電流ミラー回路を
用いる場合、電源電圧による出力電流の変動のない、入
力電流のみに応じた一定の出力電流が得られる。
As described in detail above, according to the first invention, the collector voltage of the output side current mirror TR is detected by the voltage detecting means, and the detected voltage is inputted through the voltage feedback means. Since it is fed back to the collector of the mirror TR, the collector voltage of the input side current mirror TR becomes equal to the collector voltage of the output side current mirror TR. Therefore, a constant output current according to the input current can be accurately obtained with a relatively simple circuit configuration without being affected by the change in the power supply voltage of the circuit or the voltage drop voltage of the load circuit. Therefore, for example, when the current mirror circuit is used with the power supply voltage of a wide range of circuits, a constant output current corresponding to only the input current can be obtained without the output current varying due to the power supply voltage.

【0031】第2の発明によれば、電圧検出手段及び電
圧帰還手段をそれぞれトランジスタで構成したので、該
トランジスタの持つ増幅特性を利用してコレクタ電圧の
検出と、該検出電圧の入力側電流ミラーTRのコレクタ
への帰還が、簡単かつ的確に行える。
According to the second aspect of the invention, since the voltage detecting means and the voltage feedback means are each composed of a transistor, the amplification characteristic of the transistor is used to detect the collector voltage and the input side current mirror of the detected voltage. The return of the TR to the collector can be performed easily and accurately.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例を示す電流ミラー回路の回路図
である。
FIG. 1 is a circuit diagram of a current mirror circuit showing an embodiment of the present invention.

【図2】従来の電流ミラー回路の回路図である。FIG. 2 is a circuit diagram of a conventional current mirror circuit.

【図3】従来と本実施例における電源電圧−出力電流特
性図である。
FIG. 3 is a power supply voltage-output current characteristic diagram in the related art and the present embodiment.

【符号の説明】[Explanation of symbols]

1 定電流源 2 入力側電流ミラーTR 3 出力側電流ミラーTR 4 負荷回路 5 電圧検出用TR 6 電圧帰還用TR 1 constant current source 2 input side current mirror TR 3 output side current mirror TR 4 load circuit 5 voltage detection TR 6 voltage feedback TR

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 ベースが共通接続された入力側電流ミラ
ートランジスタ及び出力側電流ミラートランジスタを有
し、前記入力側電流ミラートランジスタのコレクタに流
れる入力電流に応じた一定の電流を前記出力側電流ミラ
ートランジスタのコレクタから出力する電流ミラー回路
において、 前記出力側電流ミラートランジスタのコレクタ電圧を検
出する電圧検出手段と、 前記電圧検出手段で検出した電圧を前記入力側電流ミラ
ートランジスタのコレクタへ帰還する電圧帰還手段と
を、 設けたことを特徴とする電流ミラー回路。
1. An output side current mirror transistor having an input side current mirror transistor and an output side current mirror transistor whose bases are commonly connected, wherein a constant current according to an input current flowing through a collector of the input side current mirror transistor is output. In a current mirror circuit for outputting from the collector of a transistor, voltage detection means for detecting the collector voltage of the output side current mirror transistor, and voltage feedback for returning the voltage detected by the voltage detection means to the collector of the input side current mirror transistor. And a means for providing the current mirror circuit.
【請求項2】 請求項1記載の電流ミラー回路におい
て、 前記電圧検出手段及び電圧帰還手段をそれぞれトランジ
スタで構成したことを特徴とする電流ミラー回路。
2. The current mirror circuit according to claim 1, wherein the voltage detecting means and the voltage feedback means are each constituted by a transistor.
JP26456591A 1991-10-14 1991-10-14 Current mirror circuit Withdrawn JPH05108182A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26456591A JPH05108182A (en) 1991-10-14 1991-10-14 Current mirror circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26456591A JPH05108182A (en) 1991-10-14 1991-10-14 Current mirror circuit

Publications (1)

Publication Number Publication Date
JPH05108182A true JPH05108182A (en) 1993-04-30

Family

ID=17405054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26456591A Withdrawn JPH05108182A (en) 1991-10-14 1991-10-14 Current mirror circuit

Country Status (1)

Country Link
JP (1) JPH05108182A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6400215B1 (en) 1999-03-17 2002-06-04 Kabushiki Kaisha Toshiba Mirror circuit
US7988210B2 (en) 2006-10-20 2011-08-02 Kubota Corporation Cabin door device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6400215B1 (en) 1999-03-17 2002-06-04 Kabushiki Kaisha Toshiba Mirror circuit
US7988210B2 (en) 2006-10-20 2011-08-02 Kubota Corporation Cabin door device

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