JPS61140209A - Current source circuit - Google Patents

Current source circuit

Info

Publication number
JPS61140209A
JPS61140209A JP59262214A JP26221484A JPS61140209A JP S61140209 A JPS61140209 A JP S61140209A JP 59262214 A JP59262214 A JP 59262214A JP 26221484 A JP26221484 A JP 26221484A JP S61140209 A JPS61140209 A JP S61140209A
Authority
JP
Japan
Prior art keywords
transistor
emitter
power source
current source
source circuit
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.)
Pending
Application number
JP59262214A
Other languages
Japanese (ja)
Inventor
Hisashi Watanabe
寿 渡辺
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP59262214A priority Critical patent/JPS61140209A/en
Publication of JPS61140209A publication Critical patent/JPS61140209A/en
Pending legal-status Critical Current

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  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To obtain output current proportional to power source voltage by connecting the base of a PNP transistor to the emitter of an NPN transistor to which base bias is supplied by partial pressure resistance provided between power source voltage and grounding and connecting the emitter of the PNP transistor to power source voltage. CONSTITUTION:A power source terminal 11 to which power source voltage Va is supplied is grounded through series resistances R1, R2 and the base of an NPN transistor Q2 as the first transistor is connected to the connecting point of resistances R1, R2. The collector of the transistor Q2 is connected to the power source terminal 11 and the emitter is grounded through a resistance R4, and at the same time, connected to the base of a PNP transistor Q1 as the second transistor. The emitter of the transistor Q1 is connected to the power source terminal 11 through a resistance R3 and the collector is connected to an output terminal 12.

Description

【発明の詳細な説明】 〔発明の技術分野〕 この発明は、手導体回路に係わシ、特に、電流源回路に
関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hand conductor circuit, and particularly to a current source circuit.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

第３図は従来の電流源回路を示すものである。 FIG. 3 shows a conventional current source circuit.

電源電圧ｖ１が供給される電源端子１１は抵抗Ｒ１、ダ
イオードＤＩ、抵抗Ｒ２を直列に介して接地される。前
記ダイオードＤＩ　と抵抗Ｒ２の接続点にはＰＮＰ　）
ツ／ジスタＱｌのベースが接続される。このトランジス
タＱ１のエミッタは抵抗Ｒ３を介して前記電源端子１１
１１Ｃ接続され、コレクタは出力端子１２に接続される
。A power supply terminal 11 to which a power supply voltage v1 is supplied is grounded through a resistor R1, a diode DI, and a resistor R2 in series. There is a PNP at the connection point between the diode DI and the resistor R2)
The base of the transistor Ql is connected. The emitter of this transistor Q1 is connected to the power supply terminal 11 via a resistor R3.
11C connection, and the collector is connected to the output terminal 12.

上記構成において、ダイオードＤＩの順方向電圧をＶＩ
Ｐとし、トランジスタＱ１のベース、エミッタ間電圧を
ｖＢＰ！とじ、ｖＦ＝ｖＢｌとすれば、出力電流ｒ２は Ｉ　２　”　Ｉ　Ｉ　　Ｒｔ／Ｒｓ となる。即ち、出力電流■２は第４図に！で示す如く、
Ｖａ−ＶＦに比例する値となり、ダイオードＤ１の順方
向電流ｖＦに依存した電流源回路となる問題を有してい
る。In the above configuration, the forward voltage of diode DI is VI
P, and the voltage between the base and emitter of transistor Q1 is vBP! If vF=vBl, the output current r2 becomes I 2 '' I I Rt/Rs.In other words, the output current 2 is as shown in Figure 4 with !
The value is proportional to Va-VF, which has the problem of making the current source circuit dependent on the forward current vF of the diode D1.

〔発明の目的〕[Purpose of the invention]

この発明は上記事情に基づいてなされたものであシ、そ
の目的とするところは、電源電圧に比例した出力電流を
得ることが可能な電流源回路を提供しようとするもので
ある。The present invention has been made based on the above circumstances, and its object is to provide a current source circuit capable of obtaining an output current proportional to the power supply voltage.

〔発明の概要〕[Summary of the invention]

この発明は、例えば電源電圧と接地間に設けられた分圧
抵抗によつてベースバイアスが供給されたＮＰＮ　トラ
ンジスタのエミッタに、ＰＮＰトランジスタのベースを
接続し、このＰＮＰ　）　ラ７ジスタのエミッタを電源
電圧に接続し、コレクタから出力電流を得るように構成
したものである。In this invention, the base of a PNP transistor is connected to the emitter of an NPN transistor to which a base bias is supplied by a voltage dividing resistor provided between a power supply voltage and ground, and the emitter of this PNP transistor is connected to a power supply. It is connected to a voltage and configured to obtain an output current from the collector.

〔発明の実施例〕[Embodiments of the invention]

以下、この発明の一実施例について図面を参照して説明
する。尚、第４図と同一部分には同一符号を付す。An embodiment of the present invention will be described below with reference to the drawings. Note that the same parts as in FIG. 4 are given the same reference numerals.

第１図において、電源電圧Ｖ＆が供給される電源端子１
ノは抵抗Ｒ１，Ｒｚを直列に介して接地され、これら抵
抗Ｒ１，Ｒ，の接続点には第１のトランジスタとしての
ＮＰＮ　トランジスタＱ２のベースが接続される。この
トランジスタＱ２のコレクタは前記電源端子１ノに接続
され、エミッタは抵抗Ｒ４を介して接地されるとともに
第２のトランジスタとしてのＰＮＰ　トランジスタＱ凰
のベースに接続される。このトランジスタＱｌのエミッ
タは抵抗Ｒ３を介して前記電源端子１１に接続され、コ
レクタは出力端子１２に接続される。In FIG. 1, power supply terminal 1 to which power supply voltage V& is supplied
is grounded through resistors R1 and Rz in series, and the base of an NPN transistor Q2 as a first transistor is connected to the connection point of these resistors R1 and R. The collector of this transistor Q2 is connected to the power supply terminal 1, and the emitter is grounded through a resistor R4, and is also connected to the base of a PNP transistor Q as a second transistor. The emitter of this transistor Ql is connected to the power supply terminal 11 via a resistor R3, and the collector is connected to the output terminal 12.

上記構成において、トランジスタＱ１．Ｑ２のベース、
エミッタ間電圧をそれぞれｖＢｌｌ　１ｖＢ１２とし、
これらがｖＢＩｌ＝　ｖＢＥ２なる関係にあるものとす
ると、出力電流■２は Ｉ　２　＝　Ｉ　Ｉ　Ｒ４／　Ｒ３ となる。In the above configuration, transistor Q1. Q2 base,
Let the emitter voltage be vBll 1vB12, respectively,
Assuming that these are in the relationship vBIl=vBE2, the output current 2 becomes I 2 =I I R4/R3.

即ち、上記実施例によれば、出力電流Ｉ２は第４図に■
で示す如く、電源電圧ｖ１に比例した値となる。しかも
、このような構成とすることによシ、従来の回路に比べ
て大きな出力電流を得ることができるものである。That is, according to the above embodiment, the output current I2 is shown in FIG.
As shown, the value is proportional to the power supply voltage v1. Furthermore, with such a configuration, a larger output current can be obtained compared to conventional circuits.

尚、この発明は上記実施例に限定されるものではなく、
第２図に示す如く、トランジスタＱ２をＰＮＰ　トラン
ジスタとし、トランジスタＱ１をＮＰＮ　）う／ジスタ
とし、このトランジスタＱ＋のエミッタを抵抗Ｒ３を介
して接地し、コレクタを出力端子１２に接続した構成と
しても上記と同様の効果を得ることができる。Note that this invention is not limited to the above embodiments,
As shown in FIG. 2, the above configuration may also be used in which the transistor Q2 is a PNP transistor, the transistor Q1 is an NPN transistor, the emitter of this transistor Q+ is grounded via a resistor R3, and the collector is connected to the output terminal 12. You can get the same effect as .

その他、この発明の要旨を変えない範囲で種糧変形実施
可能なことは勿論である。It goes without saying that other variations can be made without departing from the gist of the invention.

〔発明の効果″〕〔Effect of the invention"〕

以上、詳述したようにこの発明によれば、電源電圧に比
例した出力電流を得ることが可能な電流源回路を提供で
きる。As described in detail above, according to the present invention, it is possible to provide a current source circuit that can obtain an output current proportional to the power supply voltage.

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

第１図はこの発明に係わる電流源回路の一実施例を示す
回路構成図、第２図はこの発明の他の実施例を示す回路
構成図、第３図は従来の電流源回路を示す回路構成図、
第４図はこの発明に係わる電流源回路と従来の電流源回
路の出力電流特性を示す図である。 Ｑ！・・・第１のトランジスタ、ＱＩ　・・・第２のト
ランジスタ、ｖｌ・・・電源特性、１２・・・出力端子
。 出願人代理人　　弁理士　鈴　江　武　彦第１図 第２図 第３図 第４！１ −Ｆ）ＦFIG. 1 is a circuit configuration diagram showing one embodiment of a current source circuit according to the present invention, FIG. 2 is a circuit configuration diagram showing another embodiment of the invention, and FIG. 3 is a circuit diagram showing a conventional current source circuit. Diagram,
FIG. 4 is a diagram showing output current characteristics of a current source circuit according to the present invention and a conventional current source circuit. Q! ...First transistor, QI...Second transistor, vl...Power supply characteristics, 12...Output terminal. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4!1-F)F

Claims (3)

【特許請求の範囲】[Claims] （１）第１、第２の電位間に設けられた分圧抵抗によっ
てベースバイアスが供給され、エミッタ、コレクタが抵
抗を介して前記第１、第２の電位間に接続された第１の
トランジスタと、ベースが前記第１のトランジスタのエ
ミッタに接続され、エミッタが抵抗を介して前記第１の
トランジスタのコレクタに接続され、コレクタが出力端
とされた第１のトランジスタと異極性の第２のトランジ
スタとを具備したことを特徴とする電流源回路。(1) A first transistor whose base bias is supplied by a voltage dividing resistor provided between the first and second potentials, and whose emitter and collector are connected between the first and second potentials via the resistor. and a second transistor having a different polarity from the first transistor, the base of which is connected to the emitter of the first transistor, the emitter of which is connected to the collector of the first transistor via a resistor, and the collector of which is an output terminal. A current source circuit characterized by comprising a transistor. （２）前記第１のトランジスタはＮＰＮトランジスタか
らなり、第２のトランジスタはＰＮＰトランジスタから
なることを特徴とする特許請求の範囲第１項記載の電流
源回路。(2) The current source circuit according to claim 1, wherein the first transistor is an NPN transistor, and the second transistor is a PNP transistor. （３）前記第１のトランジスタはＰＮＰトランジスタか
らなり、第２のトランジスタはＮＰＮトランジスタから
なることを特徴とする特許請求の範囲第１項記載の電流
源回路。(3) The current source circuit according to claim 1, wherein the first transistor is a PNP transistor, and the second transistor is an NPN transistor.
JP59262214A 1984-12-12 1984-12-12 Current source circuit Pending JPS61140209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59262214A JPS61140209A (en) 1984-12-12 1984-12-12 Current source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59262214A JPS61140209A (en) 1984-12-12 1984-12-12 Current source circuit

Publications (1)

Publication Number Publication Date
JPS61140209A true JPS61140209A (en) 1986-06-27

Family

ID=17372660

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59262214A Pending JPS61140209A (en) 1984-12-12 1984-12-12 Current source circuit

Country Status (1)

Country Link
JP (1) JPS61140209A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02198208A (en) * 1989-02-09 1990-08-06 Matsushita Electric Ind Co Ltd Voltage current conversion circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02198208A (en) * 1989-02-09 1990-08-06 Matsushita Electric Ind Co Ltd Voltage current conversion circuit
JPH0624294B2 (en) * 1989-02-09 1994-03-30 松下電器産業株式会社 Voltage-current conversion circuit

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