JPS5980009A - Gain controller of amplifier - Google Patents
Gain controller of amplifierInfo
- Publication number
- JPS5980009A JPS5980009A JP57191202A JP19120282A JPS5980009A JP S5980009 A JPS5980009 A JP S5980009A JP 57191202 A JP57191202 A JP 57191202A JP 19120282 A JP19120282 A JP 19120282A JP S5980009 A JPS5980009 A JP S5980009A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- gain
- resistance
- light
- control
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
- H03G1/0047—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using photo-electric elements
Abstract
Description
【発明の詳細な説明】
この発明は負帰還回路を有する増幅器の利得制御装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amplifier gain control device having a negative feedback circuit.
従来、この種の装置として第1図に示すものがあった。Conventionally, there has been a device of this type as shown in FIG.
同図において、(1)は信号入力端子、(21゜(3)
は抵抗体、(4)は増幅器、(5)は帰還抵抗体、(6
)は出力端子、 +71 、 (81は増幅器用電源、
(9)はアナログスイッチ、 (10)は制御電源、0
】)はトランジスタ、(口は電流制限抵抗体、03は制
御入力端子である。In the same figure, (1) is a signal input terminal, (21° (3)
is a resistor, (4) is an amplifier, (5) is a feedback resistor, (6
) is the output terminal, +71, (81 is the amplifier power supply,
(9) is an analog switch, (10) is a control power supply, 0
]) is a transistor, (the port is a current limiting resistor, and 03 is a control input terminal.
つぎに動作について説明する。Next, the operation will be explained.
入力端子(1目こ加えられた入力信号が抵抗体(2)。Input terminal (the input signal applied to the first terminal is the resistor (2).
器(4)により増幅されて出力端子(6)へ出力される
。The signal is amplified by the amplifier (4) and output to the output terminal (6).
ところで、この増幅器の動作に君いて、帰還抵抗(5)
と並列に接続されたアナログスイッチ(9)をトランジ
スタ(111の制御入力端子(13に制御信号を加える
ことによりオン、オフ制御している。これにより、該ア
ナログスイッチ(9)と直列の抵抗(刊と帰還抵抗還抵
抗となる。一方、制御信号がない場合は、アナログスイ
ッチ(9)がオフとなるため、全体の帰還抵抗は抵抗(
5)にほぼ等しくなる。このように制御信号の有無によ
り、アナログスイッチ(9)をオン・オフして、増幅器
(4)の負帰還抵抗値を制御することにより、増幅度、
すなわち利得を選択できる。By the way, the feedback resistor (5) governs the operation of this amplifier.
The analog switch (9) connected in parallel with the transistor (111) is turned on and off by applying a control signal to the control input terminal (13). On the other hand, if there is no control signal, the analog switch (9) is turned off, so the overall feedback resistance is the resistance (
5). In this way, depending on the presence or absence of the control signal, the analog switch (9) is turned on and off to control the negative feedback resistance value of the amplifier (4), thereby increasing the amplification degree.
In other words, the gain can be selected.
なお、この制御できる利得の範囲を増加するためには、
同様にアナログスイッチと抵抗からなる回路を帰還抵抗
(5)並列に複数個接続すればよい。In addition, in order to increase the range of gain that can be controlled,
Similarly, a plurality of circuits each consisting of an analog switch and a resistor may be connected in parallel to the feedback resistor (5).
しかしながら、王妃構成にはつぎに示すような欠点があ
る。However, the queen configuration has the following drawbacks.
(1)利得の選択の範囲を増加するためには、アナログ
スイッチと抵抗とからなる回路とその制御回路をその数
に応じて追加しなければならないので。(1) In order to increase the range of gain selection, circuits consisting of analog switches and resistors and their control circuits must be added in proportion to their number.
回路が複雑となる〇
(21増mH41)’?!1H7)f8)カ+ 18
V以上ノ+to!圧の場合に使用できるアナログスイッ
チがなく高電圧増幅器の利得可変が容易に実現できない
。The circuit becomes complicated〇(21 increase mH41)'? ! 1H7) f8) Ka+ 18
V or more ノ+to! There is no analog switch that can be used for high-voltage amplifiers, making it difficult to vary the gain of high-voltage amplifiers.
この発明は、上記従来の欠点を解消するためになされた
もので、増幅器の負帰還回路に接続された受光素子の受
光量に応じて、増幅器の利得を制御することにより、簡
単で高機能の増幅器の利得制御装置を提供することを目
的とする。This invention was made in order to eliminate the above-mentioned conventional drawbacks, and by controlling the gain of the amplifier according to the amount of light received by the light-receiving element connected to the negative feedback circuit of the amplifier, a simple and highly functional An object of the present invention is to provide a gain control device for an amplifier.
以下、この発明の一実施例を図面にしたがって説明する
〇
第2図において、(9)は受光素子としてのCd5(9
a)と、発光素子としてL E D (9b)とから構
成されるフォトカブラで、たとえば帰還抵抗(5)と並
列ニCd S (9a)が接続され、L E D (9
b) M制御電源(ID、電流制限抵抗+12)、)ラ
ンジスタ(111と一スが制御入力端子(13となって
いる。王妃制御電源aαは、増幅器(4)の電源(7)
、 f81と共通でもよく、あるいは別系統でもよい
。An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, (9) is Cd5 (9) as a light receiving element.
a) and L E D (9b) as a light emitting element.
b) M control power supply (ID, current limiting resistor +12),) transistor (111 and one terminal are control input terminals (13). Queen control power supply aα is the power supply (7) of the amplifier (4)
, may be the same as f81, or may be of a different system.
つぎに、動作について説明する。Next, the operation will be explained.
制御入力端子(13)に制御入力を加えてトランジスタ
01)を制御することにより、フォトカブラのLED
(9b)に流れる電流量を変えて、発光量を制御すると
、受光側(E d S (9a)の抵抗値が発光量にほ
ぼ反比例して低くなる。これにより、帰還抵抗(5)と
Cd S (9a) (7)抵抗の合1ffl抵抗に定
される。すなわちCd S (9a)の抵抗値がLED
(9b)の発光量に応じて連続的4こ変化するため、
利得Aも連続的に可変制御される。By applying a control input to the control input terminal (13) and controlling the transistor 01), the LED of the photocoupler
When the amount of light emitted is controlled by changing the amount of current flowing through (9b), the resistance value of the light receiving side (E d S (9a) decreases in almost inverse proportion to the amount of light emitted. This causes the feedback resistance (5) and C S (9a) (7) The sum of the resistances is determined to be 1ffl resistance.That is, the resistance value of Cd S (9a) is the LED
(9b) changes continuously according to the amount of light emitted, so
Gain A is also continuously variable controlled.
またC d S (9a)は等価的に抵抗であり、極性
をもたないので、単極性はもちろん、両極性の増幅器に
も、そのまま使用でき、そのうえ高電圧増幅器にも使用
できるため1通常のオペレーションアンプ用のみならず
、高電圧増幅器を始め種々の増幅器の利得制御装置に広
く使用できる。Furthermore, since C d S (9a) is equivalently a resistor and has no polarity, it can be used as it is in unipolar as well as bipolar amplifiers, and can also be used in high voltage amplifiers. It can be widely used not only for operational amplifiers but also for gain control devices of various amplifiers including high voltage amplifiers.
なお、上記実施例では、 ’Cd S (9a)を帰還
抵抗(5)と並列に接続したが、この構成は種々の変形
が可能であり、たとえば、Cd S (9a)だけを帰
還抵抗として直接に利得制御することも可能である。ま
た、トランジスタ(11)の制御をリニアに行txつて
t E D (gb)の電流を連続的1こ変化させたが
、トランジスタ0】)をオン・オフを交互に繰り返して
スイッチングのデユーティ比を変える、いわゆる、PW
M制御で行なうこともCdSの特注上可能である◇また
、フォトカブラではなく、発光、受光素子を別々にする
ことも可能である。In the above embodiment, 'Cd S (9a) is connected in parallel with the feedback resistor (5), but this configuration can be modified in various ways. For example, only Cd S (9a) is connected directly as a feedback resistor. It is also possible to control the gain. In addition, the current of t E D (gb) was continuously changed by 1 by linearly controlling the transistor (11), but the switching duty ratio was changed by alternately turning on and off the transistor (0]). Change, so-called PW
It is also possible to perform M control by custom ordering CdS. Also, it is possible to use separate light-emitting and light-receiving elements instead of using a photocoupler.
以上のように、この発明lこよれば、増幅器の帰還回路
に受光素子を接続することにより、簡単な回路で、広い
範囲で利得を連続的に可変でき、そのうえ高電圧増幅器
用にも使用できる利得制御装置が得られる。As described above, according to the present invention, by connecting a light receiving element to the feedback circuit of an amplifier, the gain can be continuously varied over a wide range with a simple circuit, and it can also be used for high voltage amplifiers. A gain control device is obtained.
第1図は従来の増幅器の利得制御装置を示す回路図、第
2図はこの発明の一実施例による増幅器の利得制御装置
を示す回路図である。
(4)・・・増幅器、 (9a)・・・発光素子、(
9b)中受光素子、(イ)・・・帰還回路。
なお、図中、同一符号は同一または相当部分を示す。
代理人 葛野信−(外1名)
特許庁長官殿
1. 1<件の表示 特願昭 57−19120
2号2、発明の名称
増幅器の利得制御装置
3、補正をする者
5、補正の対象
明細書の「特許請求の範囲」および「発明の詳細な説明
」の各欄。
6、補正の内容
A、明1111書:
(1L特許請求の範囲を別紙の通り補正します。
(2)、第6頁第2行目;
「(1)」のつぎに[アナ四グスイッチは基本的にオン
・オフ状態を選択するものであるため、」を加入します
。
+31第3頁第7行目;
「スイッチが」のつぎに「少」を加入します。
(4)、第6頁第12行目;
「簡単で」のつぎに「しかもディジタル的に設定でさる
」を加入します。
(5)、第4頁第6行目;
r (13”)にJのつぎに「パルス状にJを加入しま
す。
(6)、第4頁第7行目;
「01)を」のつぎに「オン、オフ」を加入します。
(7x第4頁第8行目〜同頁第10行目;「に流れる・
・・低くなる。」とあるのを下記の通り補正します。
記
「の通電時間を制御し、パルス状に発光させると、受光
側0dS(pa)の抵抗値が発光時間にほぼ反比例して
低くなる。しかもOdSの特性上、応答が遅いので、連
続的に変化させつる。」(8)、第4頁第15行目;
「発光量」とあるのを「発光時間」と補正します。
(9)、第5頁第9行目〜同頁第14行目;「トランジ
スタ・・・ある。」とあるのを「発光時間の制御方法は
パルス中一定で周波数を可変する方法や、周波数一定で
デユーティ化(オン、オフの比)を可変する方法などが
ある。」と補正します。
α0)、第5頁第18行目;
「連続的に」のつぎに「しかもディジタル的に」を加入
します。
以 上
[(1)発光素子と、この発光素子からの光を受光し、
かつ、増幅器の帰還回路に接続されたa、a S得を制
御するように構成した増幅器の利得制御装置。」FIG. 1 is a circuit diagram showing a conventional amplifier gain control device, and FIG. 2 is a circuit diagram showing an amplifier gain control device according to an embodiment of the present invention. (4)...Amplifier, (9a)...Light emitting element, (
9b) Middle light receiving element, (a)...feedback circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) Commissioner of the Japan Patent Office 1. Displaying 1< patent application Sho 57-19120
No. 2 No. 2, Title of the invention: Amplifier gain control device 3, Person making the amendment 5, ``Claims'' and ``Detailed Description of the Invention'' columns of the specification to be amended. 6. Contents of amendment A, Mei 1111: (The scope of the 1L patent claims is amended as shown in the attached sheet. (2), page 6, line 2; After "(1)" ``Since it basically selects the on/off state,'' is added. Page 6, line 12; Next to “easy”, add “and it can be set digitally”. (5), page 4, line 6; add r (13”) after J. "Add J in a pulsed manner. (6), page 4, line 7; Add "on, off" after "01)". (7x, page 4, line 8 to line 10 of the same page;
...becomes lower. '' will be corrected as follows. When the energization time is controlled and the light is emitted in a pulsed manner, the resistance value of the light-receiving side 0dS (pa) decreases in almost inverse proportion to the light emission time.Moreover, due to the characteristics of OdS, the response is slow, so it is emitted continuously. "(8), page 4, line 15; Correct "light emission amount" to "light emission time." (9), page 5, line 9 to line 14 of the same page; "There is a transistor..." was replaced with "There are methods to control the light emission time, such as keeping the frequency constant during the pulse and varying the frequency. There are ways to keep the duty constant (on/off ratio) variable.'' α0), page 5, line 18; Add "and digitally" after "continuously". [(1) A light emitting element, receiving light from this light emitting element,
and an amplifier gain control device configured to control a, a S gain connected to a feedback circuit of the amplifier. ”
Claims (1)
つ、増幅器の帰還回路に接続された受光素子とを具備し
、上記受光素子の受光量に応じて増幅器の利得を制御す
るように構成した増幅器の利得制御装置。(1) A light-emitting element and a light-receiving element that receives light from the light-emitting element and is connected to a feedback circuit of an amplifier, and controls the gain of the amplifier according to the amount of light received by the light-receiving element. An amplifier gain control device configured as follows.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57191202A JPS5980009A (en) | 1982-10-29 | 1982-10-29 | Gain controller of amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57191202A JPS5980009A (en) | 1982-10-29 | 1982-10-29 | Gain controller of amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5980009A true JPS5980009A (en) | 1984-05-09 |
Family
ID=16270601
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57191202A Pending JPS5980009A (en) | 1982-10-29 | 1982-10-29 | Gain controller of amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5980009A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1363250A1 (en) * | 2002-04-30 | 2003-11-19 | International Currency Technologies Corporation | Magnetic verification system for bill acceptor |
-
1982
- 1982-10-29 JP JP57191202A patent/JPS5980009A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1363250A1 (en) * | 2002-04-30 | 2003-11-19 | International Currency Technologies Corporation | Magnetic verification system for bill acceptor |
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