JPH02819U

JPH02819U -

Info

Publication number: JPH02819U
Application number: JP7862588U
Authority: JP
Priority date: 1988-06-14
Filing date: 1988-06-14
Publication date: 1990-01-05

Description

[Brief explanation of drawings]

第１図は、本案による電子ボリウム回路の一実
施例を示す回路図、第２図は、従来の電子ボリウ
ム回路の一例を示す回路図である。第３図はトラ
ンジスタＱ_６の電圧―電流特性である。１…信号源、Ｑ_１，Ｑ_２，Ｑ_３，Ｑ_４…差動増
幅回路のトランジスタ、Ｑ_５…出力トランジスタ
、Ｑ_６…入力トランジスタ、Ｑ_７，Ｑ_８…カレン
トミラー回路トランジスタ、Ｒ_１，Ｒ_２，Ｒ_３…
負荷抵抗、Ｒ_４…可変抵抗。 FIG. 1 is a circuit diagram showing an embodiment of an electronic volume circuit according to the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional electronic volume circuit. FIG. 3 shows the voltage-current characteristics of transistor _Q6 . 1...Signal source, _Q1 , _Q2 , _Q3 , _Q4 ...Transistor of differential amplifier circuit, _Q5 ...Output transistor, _Q6 ...Input transistor, _Q7 , _Q8 ...Current mirror circuit transistor, R1 _, _R2 , _R3 ...
Load resistance, _R4 ...variable resistance.

補正昭６３．１０．２８実用新案登録請求の範囲を次のように補正する
。Amendment October 28, 1981 The scope of claims for utility model registration is amended as follows.

【実用新案登録請求の範囲】入力信号電圧を電流に変える入力トランジスタ
回路と、その電流をカレントミラー回路に流し、定電流
回路の電流を可変し差動増幅回路で増幅した信号
を取り出すことによつて、入力した信号の利得を入力トランジスタの電圧
―電流変換を用いて可変している電子ボリウム回
路において、可変抵抗によつて制御される定電流回路の電流
をカレントミラー回路に流すことにより差動増幅
回路の定電流を可変することを特徴とする電子ボ
リウム回路。図面の簡単な説明を次のように補正する。明細書第６頁第２０行目の「Ｑ_５…出力トラン
ジスタ」を削除する。[Claims for Utility Model Registration] An input transistor circuit that converts an input signal voltage into a current, the current is passed through a current mirror circuit, the current of the constant current circuit is varied, and a signal amplified by a differential amplifier circuit is extracted. Therefore, in an electronic volume circuit that varies the gain of an input signal using voltage-current conversion of an input transistor, the difference can be made by flowing the current of a constant current circuit controlled by a variable resistor through a current mirror circuit. An electronic volume circuit characterized by varying the constant current of a dynamic amplifier circuit. The brief description of the drawing has been amended as follows. " _Q5 ...output transistor" on page 6, line 20 of the specification is deleted.

Claims

[Scope of utility model registration request]

The input transistor circuit converts the input signal voltage into current, and the current is passed through the current mirror circuit.
In an electronic volume circuit that has an output transistor that varies the current of a constant current circuit and takes out a signal amplified by a differential amplifier circuit, and that varies the gain of the input signal using voltage-current conversion of the input transistor, a variable resistor is used. An electronic volume circuit characterized in that the constant current of a differential amplifier circuit is varied by flowing the current of a constant current circuit controlled by a current mirror circuit into a current mirror circuit.