JPS59135914A - Amplifier circuit - Google Patents

Amplifier circuit

Info

Publication number
JPS59135914A
JPS59135914A JP58010395A JP1039583A JPS59135914A JP S59135914 A JPS59135914 A JP S59135914A JP 58010395 A JP58010395 A JP 58010395A JP 1039583 A JP1039583 A JP 1039583A JP S59135914 A JPS59135914 A JP S59135914A
Authority
JP
Japan
Prior art keywords
amplifier
btl
amplifier circuit
otl
switch
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
JP58010395A
Other languages
Japanese (ja)
Other versions
JPS649767B2 (en
Inventor
Junichi Hikita
純一 疋田
Kenzou Shiyou
鍾 健三
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.)
Rohm Co Ltd
Original Assignee
Rohm 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 Rohm Co Ltd filed Critical Rohm Co Ltd
Priority to JP58010395A priority Critical patent/JPS59135914A/en
Publication of JPS59135914A publication Critical patent/JPS59135914A/en
Publication of JPS649767B2 publication Critical patent/JPS649767B2/ja
Granted legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE:To attain the operation of the titled amplifier circuit as an OTL amplifier or a BTL ampifier by connecting an output terminal of a differential amplifier by means of switching to a connecting point between two resistors or an input of one amplifier between the two amplifier. CONSTITUTION:Suppose that a switch SW1 is connected in BTL connection. Since termials (a), (b) of SW2-SW4 are connected, a part of an R+L signal synthesized of R and L channel signals is amplified at an amplifier 1' and given to one end of a load RL1. On the other hand, the R+L signal is given to a differential amplifier circuit 3 via a resistor R1. In this case, the differential amplifier circuit 3 acts like an inverse amplifir taking the resistors R1, R2 as feedback elements. As a result, after the inverted R+L signal is amplified at the amplifier 1', the signal is given to the other end of the load RL1. That is, when the switch SW1 is selected in the BTL connection, this amplifier circuit acts like a BTL amplifier. Similarly, when the switch SW1 is connected as the OTL connection, this amplifier acts like an OTL amplifier.

Description

【発明の詳細な説明】 a、技術分野 この発明はスイッチの切換えに応じてOTL (out
put  transformer−1ess)増幅器
又はBTL(balanced transforme
r−1ess)増幅器として動作する増幅回路に関する
[Detailed Description of the Invention] a. Technical Field This invention provides OTL (output) in response to switching of a switch.
put transformer-1ess) amplifier or BTL (balanced transformer-1ess) amplifier or BTL (balanced transformer-1ess) amplifier
r-1ess) relates to an amplifier circuit that operates as an amplifier.

b、従来技術 ステレオ再生装置をモノラルに切換える場合、片チャン
ネルの増幅器のみが用いられる。そのため、十分な出力
が取り出せないという欠点がある。
b. Prior Art When switching a stereo reproduction device to monaural, only one channel amplifier is used. Therefore, there is a drawback that sufficient output cannot be obtained.

ステレオ音楽をヘッドホンで聞き、モノラルはスピーカ
に切換えるような比較的小出力の音響機器において、こ
の欠点は無視することができないものである。
This drawback cannot be ignored in audio equipment with relatively low output, such as listening to stereo music through headphones and switching to speakers for monaural music.

ところで、ステレオ再生装置の多(は、第1図(イ)に
示すようにOTL増幅器で構成される。一方、同図(ロ
)に示すように負荷RLの両端に反転した信号をそれぞ
れ与えるBTL増幅器は、低電圧電源であって比較的大
きな出力を取り出すことができる。
By the way, the stereo playback device is composed of an OTL amplifier as shown in Fig. 1 (a).On the other hand, as shown in Fig. An amplifier is a low-voltage power supply that can extract a relatively large output.

尚、図において、1.1′は同じ特性を有する増幅器、
2は反転器、RQはバイアス抵抗gVBはバイアス電源
である。
In the figure, 1.1' is an amplifier with the same characteristics,
2 is an inverter, RQ is a bias resistor gVB is a bias power supply.

従って、両増幅器を切換えて使用すれば、前記欠点を排
除できるが、従来この種の適切なものはない。
Therefore, the above-mentioned drawbacks can be eliminated by switching between the two amplifiers, but there is no suitable solution of this kind to date.

C0発明の目的 この発明はスイッチの切換えに応じてOTL増幅器又は
BTL増幅器として動作する増幅回路を提供することを
目的としている。
C0 Object of the Invention The object of the invention is to provide an amplifier circuit that operates as an OTL amplifier or a BTL amplifier in response to switching of a switch.

d1発明の特徴 この発明は、同じ特性を有した2個の増幅器の各入力端
子間に抵抗R1、R2を直列に接続し、差動増幅器の一
方入力端子を抵抗R1、R2の接続点に、他方入力端子
をバイアス電源にそれぞれ接続する一方、この差動増幅
器の出力端子を抵抗R1、R2の接続点又は前記2個の
増幅器のうちの一方の増幅器の入力端子にスイッチング
によって接続し、各接続に応じてOTL増幅器又はBT
L増幅器として動作するようにしたことを特徴としてい
る。
d1 Features of the Invention This invention connects resistors R1 and R2 in series between the respective input terminals of two amplifiers having the same characteristics, and connects one input terminal of the differential amplifier to the connection point of the resistors R1 and R2. While the other input terminal is connected to the bias power supply, the output terminal of this differential amplifier is connected to the connection point of resistors R1 and R2 or the input terminal of one of the two amplifiers by switching, and each connection is OTL amplifier or BT depending on
It is characterized by operating as an L amplifier.

e、実施例 第2図はこの発明に係る増幅回路の実施例を略本したブ
ロック図である。第2図において、第1図と同一部分は
同一符号で示しである。増幅器1.1′の入力端子間に
は抵抗R1、R2が直列に接続される。3は一方の負入
力端子が抵抗R1,R2の接続点Aに、他方の正入力端
子がバイアス電圧源vBにそれぞれ接続された差動増幅
器である。SWIは差動増幅器3の出力端子を接続点A
に(以下、OTL接続という)、又は増幅器1′の入力
端子に接続する(以下、BTL接続という)ように切換
動作するスイッチである。
e. Embodiment FIG. 2 is a block diagram schematically illustrating an embodiment of an amplifier circuit according to the present invention. In FIG. 2, the same parts as in FIG. 1 are indicated by the same symbols. Resistors R1 and R2 are connected in series between the input terminals of amplifier 1.1'. 3 is a differential amplifier having one negative input terminal connected to a connection point A between resistors R1 and R2, and the other positive input terminal connected to a bias voltage source vB. SWI connects the output terminal of differential amplifier 3 to connection point A.
This is a switch that operates to connect to the input terminal of the amplifier 1' (hereinafter referred to as BTL connection) or to the input terminal of amplifier 1' (hereinafter referred to as BTL connection).

一方、SW2〜SW4は前記スイッチSWI に連動す
るスイッチで、SWIが前記BTL接続のとき、SW2
〜SW4は端子3.5間を、SWIかOTL接続のとき
端子a、c間をそれぞれ閉成する。
On the other hand, SW2 to SW4 are switches that operate in conjunction with the switch SWI, and when SWI is connected to the BTL, SW2
~SW4 closes between terminals 3 and 5, and between terminals a and c when SWI or OTL connection is made.

かかるスイッチSWI〜SW4は電気的に構成してもよ
いが、例えばヘッドホンのプラグ差し込みに伴い接点を
切り換える機械的スイッチであってもよい。
The switches SWI to SW4 may be configured electrically, but they may also be mechanical switches that change the contacts when the headphones are plugged in, for example.

次に、上述した如き構成を有する増幅回路の動作につい
て説明する。
Next, the operation of the amplifier circuit having the above-described configuration will be explained.

いま、スイッチSW1がBTL接続になっているとする
。このとき、SW2〜SW4は端子a、b間が接続して
いるから、合成されたRチャンネル信号とLチャンネル
信号(以下、R+L信号という)の一部は、増幅器1′
で増幅されて、負荷RLIの一端に与えられる。
Assume that switch SW1 is now connected to BTL. At this time, since the terminals a and b of SW2 to SW4 are connected, a part of the combined R channel signal and L channel signal (hereinafter referred to as R+L signal) is transmitted to the amplifier 1'
The signal is amplified by the RLI and applied to one end of the load RLI.

一方、R+L信号は抵抗R1を介して差動増幅回路3に
与えられる。このとき差動増幅回路3は抵抗R1、R2
を帰還素子とする反転増幅器として働(その結果、反転
されたR+L信号か増幅器1′で増幅された後、負荷R
LIの他端に与えられる。すなわち、スイッチSWIが
BTL接続のとき、この増幅回路はBTL増幅器として
動作する。
On the other hand, the R+L signal is applied to the differential amplifier circuit 3 via the resistor R1. At this time, the differential amplifier circuit 3 has resistors R1 and R2.
acts as an inverting amplifier with R+L as a feedback element (as a result, the inverted R+L signal is amplified by amplifier 1' and then sent to the load R
given to the other end of LI. That is, when the switch SWI is in BTL connection, this amplifier circuit operates as a BTL amplifier.

次に、スイッチSWIがOTL接続になった場合の動作
について説明する。このとき、SW2〜SW4は端子3
、C間が接続している。差動増幅回路3の出力端子は接
続点Aに短絡するから、接続点Aの電位はバイアス電圧
源VEのそれと等しくなる。これにより、増幅器1.1
′は所定のバイアス状態に置かれる。
Next, the operation when the switch SWI is connected to OTL will be explained. At this time, SW2 to SW4 are terminal 3
, C are connected. Since the output terminal of the differential amplifier circuit 3 is short-circuited to the connection point A, the potential of the connection point A becomes equal to that of the bias voltage source VE. This allows amplifier 1.1
' is placed in a predetermined bias state.

その結果、Rチャンネル信号及びLチャンネル信号は増
幅器、1.1′でそれぞれ増幅された後、負荷RL2、
R1に与えられる。すなわち、スイッチSWIがOTL
接続のときこの増幅回路はOTL増幅器として動作する
As a result, the R channel signal and the L channel signal are respectively amplified by the amplifier 1.1', and then the load RL2,
given to R1. In other words, switch SWI is OTL
When connected, this amplifier circuit operates as an OTL amplifier.

f、効果 この発明によれは、スイッチの切換えに応じてOTL増
幅器又はBTL増幅器として動作する増幅回路を比較的
簡単な構成で実現できる。
f. Effects According to the present invention, an amplifier circuit that operates as an OTL amplifier or a BTL amplifier in response to switching of a switch can be realized with a relatively simple configuration.

従って、この発明は、ステレオ又はモノラルにかかわら
ず、増幅回路をむだなく動作させるので、各構成部品の
利用効率が高く経済性に優れている。
Therefore, the present invention allows the amplifier circuit to operate without waste regardless of whether it is stereo or monaural, so each component is used efficiently and economically.

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

第1図はOTL増幅器及びBTL増幅器を略本したブロ
ック図、第2図はこの発明に係る増幅回路の実施例を略
本したブロック図である。 1.1′・・・増幅器、3・・・差動増幅器、R1、R
2・・・抵抗、SWI〜SW4・・・スイッチ、RLI
〜RL2・・・負荷、Vn・・・バイアス電圧源。 特許出願人 ローム株式会社 代理人弁理士大西孝治 第1図 (イ) (ロ) 第2図
FIG. 1 is a schematic block diagram of an OTL amplifier and a BTL amplifier, and FIG. 2 is a schematic block diagram of an embodiment of an amplifier circuit according to the present invention. 1.1'...Amplifier, 3...Differential amplifier, R1, R
2...Resistance, SWI~SW4...Switch, RLI
~RL2...Load, Vn...Bias voltage source. Patent applicant: Koji Onishi, Patent Attorney, ROHM Co., Ltd. Figure 1 (A) (B) Figure 2

Claims (1)

【特許請求の範囲】 同じ特性を有し、それぞれの入力端子間に抵抗R1、R
2が直列接続された2個の増幅器と、一方の入力端子が
抵抗R1とR2との接続点に、他方の入力端子がバイア
ス電源にそれぞれ接続された差動増幅器と、 前記差動増幅器の出力端子を前記抵抗R1とR2との接
続点又は前記2個の増幅器のうちの一方の増幅器の入力
端子に接続させるスイッチング手段を備えたことを特徴
とする増幅回路。
[Claims] Resistors R1 and R have the same characteristics and are connected between the respective input terminals.
2 are connected in series, a differential amplifier has one input terminal connected to the connection point between the resistors R1 and R2, and the other input terminal connected to the bias power supply, and the output of the differential amplifier. An amplifier circuit comprising switching means for connecting a terminal to a connection point between the resistors R1 and R2 or an input terminal of one of the two amplifiers.
JP58010395A 1983-01-24 1983-01-24 Amplifier circuit Granted JPS59135914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58010395A JPS59135914A (en) 1983-01-24 1983-01-24 Amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58010395A JPS59135914A (en) 1983-01-24 1983-01-24 Amplifier circuit

Publications (2)

Publication Number Publication Date
JPS59135914A true JPS59135914A (en) 1984-08-04
JPS649767B2 JPS649767B2 (en) 1989-02-20

Family

ID=11748933

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58010395A Granted JPS59135914A (en) 1983-01-24 1983-01-24 Amplifier circuit

Country Status (1)

Country Link
JP (1) JPS59135914A (en)

Also Published As

Publication number Publication date
JPS649767B2 (en) 1989-02-20

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