JPS6373706A - Amplifier circuit device - Google Patents

Amplifier circuit device

Info

Publication number
JPS6373706A
JPS6373706A JP61217413A JP21741386A JPS6373706A JP S6373706 A JPS6373706 A JP S6373706A JP 61217413 A JP61217413 A JP 61217413A JP 21741386 A JP21741386 A JP 21741386A JP S6373706 A JPS6373706 A JP S6373706A
Authority
JP
Japan
Prior art keywords
transistor
base
resistor
constant
terminal
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.)
Granted
Application number
JP61217413A
Other languages
Japanese (ja)
Other versions
JPH0716138B2 (en
Inventor
Ken Morita
森田 研
Toshinori Kojima
俊則 小島
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP61217413A priority Critical patent/JPH0716138B2/en
Publication of JPS6373706A publication Critical patent/JPS6373706A/en
Publication of JPH0716138B2 publication Critical patent/JPH0716138B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE:To contrive to attain low cost and small space by connecting a constant current source to one terminal of a resistor connected to a base of a negative feedback transistor (TR) so as to eliminate the need for a capacitor. CONSTITUTION:One terminal of a resistor 7 is connected to a constant voltage source 15 and since the AC impedance of the constant voltage source is regarded to be 0, the one terminal of the resistor 7 is regarded to be grounded in terms of AC. Further, a base bias voltage of a TR 3 is not changed due to power voltage as to the DC bias and the base bias voltage of a TR 4 is given from the constant voltage source, then the change due to the power voltage is not almost given. Thus, the potential difference between the bases of the TRs 3, 4 is kept nearly constant and stable amplification is attained independently of the power voltage.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、差動増幅器を有する増幅回路装置に関するも
のである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an amplifier circuit device having a differential amplifier.

従来の技術 従来からの差動増幅器の中には、入力端子がPNPトラ
ンジスタで、前記ベース電位を接地電位に近くし、前記
PNPトランジスタのエミッタと接地されたNPN ト
ランジスタのベースが、負帰還端子である構成のものが
多く用いられてきた。しかし、これらの差動増幅器のベ
ースバイアス電圧が異なるため、コンデンサを用いて、
直流バイアスの不整合を補なっている。
BACKGROUND OF THE INVENTION In some conventional differential amplifiers, the input terminal is a PNP transistor, the base potential is close to ground potential, and the emitter of the PNP transistor and the base of the NPN transistor, which are grounded, are negative feedback terminals. Many configurations have been used. However, since the base bias voltages of these differential amplifiers are different, using a capacitor,
Compensates for DC bias mismatch.

第3図に従来例を示す。図中、1は入力端子、2は抵抗
、3は第1のトランジスタ、4は第2のトランジスタ、
5,6はカレントミラー回路を成すトランジスタ、7は
抵抗、8はコンデンサ、9は定電流源、10は抵抗、1
1は増幅段、12は出力段、13は出力端子、14は電
源である。
FIG. 3 shows a conventional example. In the figure, 1 is an input terminal, 2 is a resistor, 3 is a first transistor, 4 is a second transistor,
5 and 6 are transistors forming a current mirror circuit, 7 is a resistor, 8 is a capacitor, 9 is a constant current source, 10 is a resistor, 1
1 is an amplification stage, 12 is an output stage, 13 is an output terminal, and 14 is a power supply.

以上のように構成された従来例の増幅回路装置において
、第1のトランジスタ3のベース端子と第2のトランジ
スタ4のベース端子との各バイアス電圧は異なっており
、トランジスタ30ベースバイアス電圧は、はぼ接地電
圧であるのに対し、トランジスタ4のベースバイアス電
圧は、2VB!であり、抵抗7を直接、接地電位につけ
ることはできない。したがって、抵抗7と接地電位との
間に、コンデンサ8を入れて、トランジスタ3のベース
と、トランジスタ40ベースとの各直流バイアス電圧の
不整合をとりのぞいている。このとき、コンデンサ8の
交流インピーダンスが十分に小さければ、抵抗7は、交
流的には接地された状態になり、増幅器の利得は、抵抗
10の値をRIOs抵抗7の値をR7とすれば、 が、交流利得になる。
In the conventional amplifier circuit device configured as described above, the bias voltages of the base terminal of the first transistor 3 and the base terminal of the second transistor 4 are different, and the base bias voltage of the transistor 30 is The base bias voltage of transistor 4 is 2VB! Therefore, the resistor 7 cannot be connected directly to the ground potential. Therefore, a capacitor 8 is inserted between the resistor 7 and the ground potential to eliminate the mismatch between the DC bias voltages between the base of the transistor 3 and the base of the transistor 40. At this time, if the AC impedance of the capacitor 8 is sufficiently small, the resistor 7 is grounded in terms of AC, and the gain of the amplifier is as follows: If the value of the resistor 10 is RIO, and the value of the resistor 7 is R7, is the AC gain.

発明が解決しようとする問題点 しかし、上述の差動増幅器はコンデンサを用いて直流バ
イアスの不整合をとりのぞいているため、集積回路の場
合等、コンデンサを外付部品として取りつけなければな
らず、部品コスト、集積回路の端子数などの増加になっ
ていた。
Problems to be Solved by the Invention However, since the above-mentioned differential amplifier uses a capacitor to eliminate DC bias mismatch, the capacitor must be attached as an external component, such as in the case of an integrated circuit. The cost of parts and the number of terminals for integrated circuits increased.

本発明は、上記問題点を解決するものであり、コストの
削減、省スペースに役立つものである。
The present invention solves the above problems and is useful for cost reduction and space saving.

問題点を解決するための手段 本発明は、上記問題点を達成するために、負帰還トラン
ジスタのベースに接続された抵抗の他の一端に、定電圧
源を接続した構成である。
Means for Solving the Problems In order to achieve the above problems, the present invention has a configuration in which a constant voltage source is connected to the other end of the resistor connected to the base of the negative feedback transistor.

作用 定電圧源に接続することにより、直流バイアス電位が安
定に固定され、しかも、交流的に接地された状態になり
、適正な交流増幅が行なわれる。
By connecting to a constant voltage source, the DC bias potential is stably fixed, and in addition, it is grounded in terms of AC, allowing proper AC amplification.

実施例 以下本発明の一実施例について、図面を参照しながら説
明する。
EXAMPLE An example of the present invention will be described below with reference to the drawings.

第1図は、本発明の一実施例における増幅装置のブロッ
ク図を示すものである。15は、電源電圧に依存しない
定電圧源である。
FIG. 1 shows a block diagram of an amplifier device according to an embodiment of the present invention. 15 is a constant voltage source that does not depend on the power supply voltage.

抵抗7の一端を定電圧源15に接続することにより、定
電圧源の交流インピーダンスはOに近いとみなすことが
できるため、抵抗7の一端は、交流的に接地された状態
とみなすことができ、交流利得は前述の(1)式の値が
得られる。
By connecting one end of the resistor 7 to the constant voltage source 15, the AC impedance of the constant voltage source can be considered to be close to O, so the one end of the resistor 7 can be considered to be AC grounded. , the value of the above-mentioned equation (1) is obtained for the AC gain.

また、直流バイアスに関して、トランジスタ3のベース
バイアス電圧は、電源電圧による変化がほとんどな(、
トランジスタ4のベースバイアス電圧は、定電圧源によ
り与えられているために、やはり、電源電圧による変化
はほとんどない。したがって、トランジスタ3とトラン
ジスタ4との各ベース間の電位差は、はぼ一定に保たれ
た状態になり、電源電圧にかかわらず、安定な増幅が行
われる。
Regarding DC bias, the base bias voltage of transistor 3 hardly changes depending on the power supply voltage (,
Since the base bias voltage of the transistor 4 is provided by a constant voltage source, there is also almost no change due to the power supply voltage. Therefore, the potential difference between the bases of transistors 3 and 4 is kept approximately constant, and stable amplification is performed regardless of the power supply voltage.

第2図には、要部の具体回路図を示す。16は抵抗、1
7.18はダイオードである。
FIG. 2 shows a specific circuit diagram of the main parts. 16 is resistance, 1
7.18 is a diode.

ダイオードの端子間電圧VBEは、電流の変化が小さけ
れば、はぼ一定とみなすことができるので、抵抗16で
定電流化されたダイオード18のアノードの電位もほぼ
一定とみなすことができ、したがって、これを定電圧源
とみることができる。
Since the voltage VBE between the terminals of the diode can be considered to be approximately constant if the change in current is small, the potential of the anode of the diode 18, which is made constant by the resistor 16, can also be considered to be approximately constant, and therefore, This can be seen as a constant voltage source.

なお、本発明の一実施例においては、入力端子が、接地
電位にバイアスされている場合を示したが、任意の電位
においても可能である。
In one embodiment of the present invention, the case where the input terminal is biased to the ground potential is shown, but the input terminal may be biased to any potential.

発明の効果 以上のように、本発明の増幅回路装置は、負帰還端子に
接続されるコンデンサを不用とし、また、定電圧源を集
積回路にとりこむことを可能にし、低コスト、省スペー
スに十分な効果をもたらすものである。
Effects of the Invention As described above, the amplifier circuit device of the present invention eliminates the need for a capacitor connected to the negative feedback terminal, makes it possible to incorporate a constant voltage source into an integrated circuit, and achieves sufficient cost and space savings. It brings about a great effect.

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

第3図は従来例増幅回路装置を示すブロック図、第1図
は本発明の一実施例の増幅回路装置を示すブロック図、
第2図は同要部の具体回路図である。 1・・・・・・入力端子、3・・・・・・第1のトラン
ジスタ、4・・・・・・第2のトランジスタ、11・・
・・・・増幅段、12・・・・・・出力段、13・・・
・・・出力端子、15・・・・・・定電圧源。 代理人の氏名 弁理士 中尾敏男 ばか1名第1図 第2図 第3図
FIG. 3 is a block diagram showing a conventional amplifier circuit device, FIG. 1 is a block diagram showing an amplifier circuit device according to an embodiment of the present invention,
FIG. 2 is a specific circuit diagram of the main part. 1...Input terminal, 3...First transistor, 4...Second transistor, 11...
...Amplification stage, 12...Output stage, 13...
...Output terminal, 15... Constant voltage source. Name of agent Patent attorney Toshio Nakao One idiot Figure 1 Figure 2 Figure 3

Claims (1)

【特許請求の範囲】[Claims] 所定電位にバイアスされたベースを入力端子とする第1
のトランジスタのエミッタと、前記第1のトランジスタ
のベース電位とは異なるベース電位の与えられた第2の
トランジスタのエミッタとを接続した入力部に対して、
出力信号を前記第2のトランジスタのベースに帰還結合
するとともに、前記第2のトランジスタのベース電位を
定電圧源により設定する構成をそなえたことを特徴とす
る増幅回路装置。
A first terminal whose input terminal is a base biased to a predetermined potential.
to an input section connecting the emitter of a transistor and the emitter of a second transistor to which a base potential different from the base potential of the first transistor is connected;
1. An amplifier circuit device comprising: a configuration in which an output signal is feedback-coupled to the base of the second transistor, and a base potential of the second transistor is set by a constant voltage source.
JP61217413A 1986-09-16 1986-09-16 Amplifier circuit device Expired - Lifetime JPH0716138B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61217413A JPH0716138B2 (en) 1986-09-16 1986-09-16 Amplifier circuit device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61217413A JPH0716138B2 (en) 1986-09-16 1986-09-16 Amplifier circuit device

Publications (2)

Publication Number Publication Date
JPS6373706A true JPS6373706A (en) 1988-04-04
JPH0716138B2 JPH0716138B2 (en) 1995-02-22

Family

ID=16703813

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61217413A Expired - Lifetime JPH0716138B2 (en) 1986-09-16 1986-09-16 Amplifier circuit device

Country Status (1)

Country Link
JP (1) JPH0716138B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02308605A (en) * 1989-05-23 1990-12-21 Nec Kansai Ltd Power amplifier
US6287019B1 (en) 1998-06-23 2001-09-11 Yazaki Corporation Optical connector
US8905649B2 (en) 2010-10-19 2014-12-09 Furukawa Electric Co., Ltd. Optical fiber terminal fixing member, optical connector, and optical fiber cable with connector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02308605A (en) * 1989-05-23 1990-12-21 Nec Kansai Ltd Power amplifier
US6287019B1 (en) 1998-06-23 2001-09-11 Yazaki Corporation Optical connector
US8905649B2 (en) 2010-10-19 2014-12-09 Furukawa Electric Co., Ltd. Optical fiber terminal fixing member, optical connector, and optical fiber cable with connector

Also Published As

Publication number Publication date
JPH0716138B2 (en) 1995-02-22

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