JPS63211805A - Gain control circuit - Google Patents

Gain control circuit

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Publication number
JPS63211805A
JPS63211805A JP4258687A JP4258687A JPS63211805A JP S63211805 A JPS63211805 A JP S63211805A JP 4258687 A JP4258687 A JP 4258687A JP 4258687 A JP4258687 A JP 4258687A JP S63211805 A JPS63211805 A JP S63211805A
Authority
JP
Japan
Prior art keywords
amplifier
gain
circuit
gain control
control 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
JP4258687A
Other languages
Japanese (ja)
Inventor
Masahiko Shinagawa
品川　正彦
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4258687A priority Critical patent/JPS63211805A/en
Publication of JPS63211805A publication Critical patent/JPS63211805A/en
Pending legal-status Critical Current

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  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To form a gain control circuit with simplicity and high reliability by decreasing number of active circuit components and then number of operational amplifiers and adding some gate conditions to a control signal. CONSTITUTION:An amplifier 12 is an amplifier having gains of 1, r, r<2>, r<3> to be switched, and an amplifier 13 is an amplifier having gains of 1, r<4>, r<8>, r<12> to be switched. Gain control signals 3, 4, 5, 6 enter gain deciding circuit 14, 15 to decide the gain of the amplifiers 12, 13 thereby obtaining the gains of 1, 2, r<2>,..., r<15>. Thus, the gain control circuit is simplified and number of active components, that is, operational amplifiers having large dispersion among components is decreased and the effect of improving the reliability is expected.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、利得制御回路に係り、特に利得が雪。[Detailed description of the invention] [Industrial application field] The present invention relates to a gain control circuit, and particularly relates to a gain control circuit.

機関数的に変化する様なオペアンプを用いた利得制御回
路に関する。This paper relates to a gain control circuit using an operational amplifier that changes in terms of the number of engines.

〔従来の技術〕[Conventional technology]

従来、増幅器の利得を、１．ｒ、ｒ２．・・・、ｒｌに
変化させようとするとき、Ｉ、ｏｇ２ｎ以上の切り換え
、及び能動素子を要した。これをブロック図に。Conventionally, the gain of an amplifier is set to 1. r, r2. . . , rl required more switching than I, og2n, and an active element. Make this into a block diagram.

より、ｎ−１５のときについて、第３図で説明する。入
出力信号１，２に対し、８　、９　、１０　、１１゜の
４段の増幅器から成る。増幅器８は１．ｒの切。The case of n-15 will be explained with reference to FIG. It consists of four stages of amplifiers of 8 degrees, 9 degrees, 10 degrees, and 11 degrees for input and output signals 1 and 2. The amplifier 8 is 1. Cut of r.

り替えを持つ。同様に増幅器９は１．ｒ２．１０は１゜
ｒ’　、　１１は１．ｒ８の切り替えを持つ。これらの
。have a replacement. Similarly, amplifier 9 is 1. r2.10 is 1°r', 11 is 1. Has r8 switching. these.

切り替えは制御信号３，１，５．６によって切り。Switching is done by control signals 3, 1, 5.6.

替えられ、これらによって、１　、　ｒ　、　ｒ２．・
・・、ｒｌ、ｌｉの指数関数的な利得の変化を達成して
いる。この。1, r, r2.・
. . , achieves an exponential change in gain of rl, li. this.

ため、４段の増幅回路を必要としていた。　　　ｌｔｌ
なお本発明に関連するものには例えば、特開昭。Therefore, a four-stage amplifier circuit was required. ltl
In addition, examples related to the present invention include JP-A-Sho.

５９−１４６４１３号ディスク再生装置がある。There is a disc playback device No. 59-146413.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上記従来技術は、指数関数的な増幅度を要する利得制御
回路は、多段の増幅回路、ひいては多くの回路素子を必
要としていた。In the above-mentioned prior art, the gain control circuit that requires an exponential amplification degree requires a multi-stage amplifier circuit and, in turn, many circuit elements.

本発明の目的は、当該利得制御回路において、多段の増
幅回路な廃し、一段ある（・は極力少ない段数の増幅回
路をもって本機能を達成しようと大る利得制御回路を提
供することにある。An object of the present invention is to provide a gain control circuit that eliminates the need for multi-stage amplifier circuits and achieves this function with a single-stage amplifier circuit (.) with as few stages as possible.

〔問題点を解決するための手段〕[Means for solving problems]

上記目的は、能動回路素子、ひいてはオペアン。 The above purpose is for active circuit elements and thus op-amps.

プの数を減らし制御信号に若干のゲート条件を付。The number of gates is reduced and some gate conditions are added to the control signals.

加することにより、より簡単で信頼度の高い利得制御回
路を達成することができる。By adding this, a simpler and more reliable gain control circuit can be achieved.

〔作用〕[Effect]

第２図のブロック図により本発明の詳細な説明する。増
幅器１２は、１　、　ｒ　、　ｒ２．　ｒ’の利得切替
を持つ増幅器であり、増幅器１３は、１　、　ｒ’　。The present invention will be explained in detail with reference to the block diagram of FIG. The amplifier 12 has 1, r, r2 . The amplifier 13 is an amplifier with gain switching of 1, r'.

ＴＩ　、　ｒｌ２の利得切替を持つ増幅器である。利得
制御０ 御信号３，４，５．６は、利得決定回路１４　、１５に
入り、増幅器１２　、１３の利得を決定し、それぞれの
組合せにより、１　、　ｒ　、　ｒ’　、・・・、ｒ９
６の利得を得ることができる。It is an amplifier with gain switching of TI and rl2. Gain control 0 control signals 3, 4, 5.6 enter gain determining circuits 14, 15 to determine the gains of amplifiers 12, 13, and depending on the respective combinations, 1, r, r', ..., r9
A gain of 6 can be obtained.

〔実施例〕〔Example〕

以下、本発明の一実施例を第１図により説明する。増幅
器１２は、オペアンプ２２、及びその周辺の抵抗１６〜
２１からなり、その利得は、１．ｒ。An embodiment of the present invention will be described below with reference to FIG. The amplifier 12 includes an operational amplifier 22 and resistors 16 around it.
21, and its gain is 1. r.

ｒ２　、　ｒｌに設定する。Set to r2, rl.

これは、点３０１点３１の電位をＶ２Ｏ，Ｖ３１、抵抗
１６の抵抗値をＲ１６等と表わす様にすると　。This can be done by representing the potentials of points 301 and 31 as V2O, V31, and the resistance value of resistor 16 as R16, etc.

Ｖ３１＝−Ｒ２１／Ｒ２０−Ｖ２Ｏ・、・−（１）。V31=−R21/R20−V2O・,・−(1).

またゲー）　３３　、３４　、３５は全てオフか、いず
れか１個のゲートがオンする様にする。全てオフのどき
は −　　ｖ３””Ｒ１６＋Ｒ２０−■’　　　””・・　
（２”例えば、ゲート３３がオンした場合は ｖ　３０＝　　Ｒ２０／１７　　　　、　Ｖ１＋＋　（
３，，０Ｒ１６＋Ｒ２０／／Ｒ１７ （２）’　＋　（３）’において、 ＸＯ−」ユム Ｒ２０””“°（４）・ とじ、（５）と同様にゲー）　３４　、５５がオンした
場合。Also, gates 33, 34, and 35 are all off, or one of them is turned on. When everything is off, -v3""R16+R20-■'""...
(2" For example, when gate 33 is turned on, v 30 = R20/17, V1++ (
3,,0R16+R20//R17 (2)' + (3)', XO-"YumR20""°(4). Close, same game as (5)) When 34 and 55 are turned on.

の（５）に相当する式をＸ２．Ｘ５とおく。Expression corresponding to (5) of X2. Let's call it X5.

（１）において Ｋ　−一旦　　　　　　　・・・・・・　（６）。In (1) K - Once... (6).

とし、（２）〜（５）を代入すると　　　　　　　　　
　。。and substituting (2) to (5), we get
. .

、３　。, 3.

Ｖ　３１　＝　Ｋ　・了Ｔ了τ・Ｖ　１　−　　　（７
）　。V 31 = K ・ENDT τ・V 1 − (7
).

Ｖ　３１　＝　Ｋ　−１＋Ｘ１−　Ｖ　１　　・−・・
・−（８）　　−Ｖ　３１　＝　Ｋ　−１＋Ｘ２−　Ｖ
　１　　・−・・−・（９）Ｖ　５１−　Ｋ　−１＋Ｘ
３・Ｖ　１−・・−（ｉｏ）　：（７）〜（１０）に必
要所望の利得を入れると、１　＋ＸＯ・・・・・・　（
１１） −」針−−ｒ　　・・・・・・　（１２）・１＋Ｘ１ Ｋ　−−ｒｓ　　　・・・・・・　（１４）・１　＋Ｘ
　６ の式を得る。これらの式よりＲ１６〜Ｒ２１は決定。V 31 = K −1+X1− V 1 ・−・・
・−(8) −V 31 = K −1+X2− V
1 ・−・・−・(9)V 51− K −1+X
3・V 1−・・・−(io) : Inserting the necessary and desired gain into (7) to (10), 1 +XO・・・・・・ (
11) -'' needle -r ...... (12)・1+X1 K --rs ....... (14)・1 +X
6 is obtained. R16 to R21 are determined from these formulas.

される。オペアンプ２９、及び周辺の抵抗１（２３〜１
５Ｒ２Ｂも必要な利得を１　、　ｒ’　、　ｒ”　、　
ｒ１２とすることにより容易に決定される。be done. Operational amplifier 29 and peripheral resistor 1 (23 to 1
5R2B also has the required gain as 1, r', r'',
It is easily determined by setting r12.

以上は、利得切り替えを、１１　ｒｌ　ｒ２１・・・、
ｒ１５とした例であるが、オペアンプ２９側の利得切り
替えを、ｒ−’、　１１　”ｌ　ｒ８と設定すれば、全
体と、。The above describes the gain switching as 11 rl r21...
In the example where r15 is used, if the gain switching on the operational amplifier 29 side is set to r-', 11''l r8, then the whole.

・　４　・ して、ｒ−４，ｒ−Ｈｌ・・・、ｒ１２　の利得切り替
えを得る。4. Gain switching of r-4, r-Hl..., r12 is obtained.

ことができる。be able to.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、利得制御回路の簡略化が可能。 According to the present invention, the gain control circuit can be simplified.

となり、素子間バラツキの大きい能動素子、オペ。Therefore, active elements and operations with large variations between elements.

アンプを減することが可能となるため信頼性向上。Reliability is improved because the number of amplifiers can be reduced.

の効果が期待でき、またより安価に当該回路を実。This circuit can be expected to have the following effects, and the circuit can be implemented at a lower cost.

現できるという効果がある。It has the effect of being able to express itself.

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

第１図は、本発明の一実施例を示す回路図、第、。 ３図は従来回路のブロック図、第２図は本発明を。 示すブロック図である。 １・・・入力信号、２・・・出力信号、３〜６・・・利
得制御。 信号、７・・・利得切替器、８〜１３・・・増幅器、１
４．。 １５・・・利得設定回路、２２　、２９・・・オペアン
プ。　１５、□　／−） 代理人弁理士　小　　川　　勝　゛男、。 ８　Ｉ　図 ／Ｚ　　　ｚＩ　　　　　　　　Ｉ３　２Ｅｊ１’　　
　　　　２７ ｔ　　　　　Ｉ６　　ｚｏ「−１３２ ■ １手　３０　ｌ　　　　　　　１ ３ｒ１　　　ｌ　　　　　＋　　　　＋”Ｌ　　　　　
　３７１　　　　　１ Ｌ　　　　　　　ＪＺ 仝ｌ　　　Ｉ　　　　１７　．２２ 第２図 第　３　図 １Φ ！　入力／ｉ盲号　　　Ｉ３　　増幅回外２　本ガイ畜
号　　　Ｉ４−　利眉４史ミ凹外１２増幅回路　７５　
　　りFIG. 1 is a circuit diagram showing one embodiment of the present invention. Figure 3 is a block diagram of a conventional circuit, and Figure 2 is a diagram of the present invention. FIG. 1... Input signal, 2... Output signal, 3-6... Gain control. Signal, 7...Gain switch, 8-13...Amplifier, 1
4. . 15...gain setting circuit, 22, 29... operational amplifier. 15, □ /-) Masaru Ogawa, patent attorney. 8 I Figure/Z zI I3 2Ej1'
27 t I6 zo "-132 ■ 1 move 30 l 1 3r1 l + +"L
371 1 L JZ 仝l I 17. 22 Figure 2 Figure 3 Figure 1Φ! Input/i blind code I3 Amplification supination 2 Hongui number I4- Limei 4 history Mi concave outside 12 amplifier circuit 75
the law of nature

Claims (1)

【特許請求の範囲】[Claims] １、制御信号により指数関数的に増幅度が変化する増幅
回路で、オペアンプとオペアンプに所定の増幅度を与え
る複数のインピーダンスと、インピーダンスを適当に切
り換えることにより指数関数的に変化する増幅度をもた
せる様な制御信号と、当該信号によりインピーダンスの
切り換えを行なう切り換え回路からなることを特徴とす
る利得制御回路。1. An amplifier circuit whose amplification changes exponentially depending on the control signal, which has multiple impedances that give a predetermined amplification to the operational amplifier and the operational amplifier, and which provides an exponentially changing amplification by appropriately switching the impedances. 1. A gain control circuit comprising a control signal such as the above, and a switching circuit that switches impedance using the signal.
JP4258687A 1987-02-27 1987-02-27 Gain control circuit Pending JPS63211805A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4258687A JPS63211805A (en) 1987-02-27 1987-02-27 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4258687A JPS63211805A (en) 1987-02-27 1987-02-27 Gain control circuit

Publications (1)

Publication Number Publication Date
JPS63211805A true JPS63211805A (en) 1988-09-02

Family

ID=12640169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4258687A Pending JPS63211805A (en) 1987-02-27 1987-02-27 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS63211805A (en)

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