KR910004456Y1 - Sound control circuit improving large input characteristic - Google Patents
Sound control circuit improving large input characteristic Download PDFInfo
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- KR910004456Y1 KR910004456Y1 KR2019880020882U KR880020882U KR910004456Y1 KR 910004456 Y1 KR910004456 Y1 KR 910004456Y1 KR 2019880020882 U KR2019880020882 U KR 2019880020882U KR 880020882 U KR880020882 U KR 880020882U KR 910004456 Y1 KR910004456 Y1 KR 910004456Y1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
- H03G7/004—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers using continuously variable impedance devices
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- Control Of Amplification And Gain Control (AREA)
Abstract
내용 없음.No content.
Description
제 1 도는 종래의 회로도.1 is a conventional circuit diagram.
제 2 도는 본 고안의 회로도.2 is a circuit diagram of the present invention.
제 3 도는 제 2 도의 등가회로.3 is an equivalent circuit of FIG.
제 4 도는 제 3 도에 의한 본 고안의 등가회로.4 is an equivalent circuit of the present invention according to FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
A : 증폭기 Q11-Q22: 트랜지스터A: Amplifier Q 11 -Q 22 : Transistor
VREF: 기준전압 T'1: 조절용 전원인가 단자V REF : Reference voltage T ' 1 : Terminal for adjustment power supply
T2' : 신호입력단자 R14, R15, R17-R19: 저항T 2 ': Signal input terminal R 14 , R 15 , R 17 -R 19 : Resistance
본 고안은 대입력 특성이 개선된 음향 조절회로에 관한 것으로 일정레벨이상 제어를 할때 입력신호 크기를 줄여서 음량조절회로 입력에 제공할 수 있도록 한것이다.The present invention relates to a sound control circuit with improved large input characteristics, and to provide a volume control circuit input by reducing the size of the input signal when controlling a predetermined level or more.
종래의 회로로서는 제 1 도와 같이 신호입력단자(T2)로 입력받으며 트랜지스터(Q3-Q8) 및 다이오드(D1)로된 증폭기와 조절용 전원인가단자(T1)로 입력받는 저항(R)(R2) 및 트랜지스터(Q1)(Q2)로 구성하여 사용하였다.As a conventional circuit, as shown in the first diagram, a signal input terminal T 2 is input, and a resistor R is inputted to an amplifier consisting of transistors Q 3 -Q 8 and diode D 1 and to a power supply terminal T 1 for regulation. ) R 2 and transistors Q 1 (Q 2 ).
R1, R2는 저항, Vcc는 인가전압이다.R 1 and R 2 are resistors and Vcc is an applied voltage.
신호 입력단자(T2)에 입력되는 음성신호를 조절용 전원 인가단자(T1)의 전압을 변화시켜 트랜지스터(Q5-Q7) 및 다이오드(D1)에서 음량조절기능을 가지며, 조절원리는 전압이득인 AV=gm×RL을 이용하며 조절기의 전달 콘덕턴스인 gm은 트랜지스터(Q5)(Q6)의 이미터 전류(IE)의 변화로 한다.The voice signal input to the signal input terminal (T 2 ) by changing the voltage of the power supply terminal (T 1 ) for the control has a volume control function in the transistor (Q 5 -Q 7 ) and diode (D 1 ), the principle of adjustment The voltage gain, A V = g m × R L, is used and the transfer conductance of the regulator, gm, is the change in the emitter current I E of transistors Q 5 and Q 6 .
트랜지스터(Q2-Q4)는 전류거울(current mirror)로 조절용 전원인가 단자(T1)를 통하여 변하는 트랜지스터(Q1)의 콜렉터전류로 각단의 전류를 조절하는 것이다. 통상 대입력이 신호 입력단자(T2)에 입력될 경우 즉, 트랜지스터(Q5)의 입력 직선성보다 클 경우에는 트랜지스터(Q5)에서 클리핑이 발생되어져 출력에는 입력특성에 의한 한계가 되어져 찌그러짐이 발생하는 것이다.The transistors Q 2 -Q 4 are current mirrors that adjust the current at each stage by the collector current of the transistor Q 1 which is changed through the power supply terminal T 1 for adjustment. Typically for input if the input to the signal input terminal (T 2) that is, when greater than the input linearity of the transistor (Q 5) has been clipping occurs in the transistor (Q 5) the output of distortion which a limitation due to the input characteristics This is what happens.
본 발명의 목적은 통상적으로 사용되는 전자음량 조절회로에서 대입력때 음량조절회로 조절시 발생되기 쉬운 음질열화를 개선하며 대입력 경우 음량조절할때 입력신호 크기를 감쇄시켜 음량 조절회로에 입력시킬 수 있도록 한것으로 도면을 참조하여 상세히 설명하면 다음과 같다.It is an object of the present invention to improve the sound quality deterioration that is likely to occur when adjusting the volume control circuit at the time of large input in the electronic volume control circuit that is commonly used and to reduce the size of the input signal when adjusting the volume in the case of the large input so that it can be input to the volume control circuit If described in detail with reference to the drawings as follows.
트랜지스터(Q5-Q8)를 증폭기로, 트랜지스터(Q2-Q4)를 전류거울로 하여 구성하는 음량조절회로에 있어서 증폭기를(A)로 하여 전류거울을 트랜지스터(Q19-Q22)로 구성하고, 기준 전압(VREF)을 트랜지스터(Q15) 이미터, 저항(R4), 및 전류 거울을 제어하는 트랜지스터(Q16)의 베이스에 각각 인가하되 각 트랜지스터(Q12)(Q15)는 공통 베이스로 하고, 트랜지스터(Q16)의 이미터와 트랜지스터(Q15)의 콜렉터를 공통 저항(Q17)을 통해 접지시키며, 조절용 전원인가 단자(T1')를 트랜지스터(Q11)(Q13)의 베이스에 제공하되 트랜지스터(Q12)는 트랜지스터(Q11)의 전압강하용으로 접속하고 분배저항(R14)(R15)은 접속접에 트랜지스터(Q)의 이미터를 공통접속하며 트랜지스터(Q13) 출력은 트랜지스터(Q14)를 구동케하여 베이스 극성이 다른 트랜지스터(Q17)(Q18) 패어의 베이스에 각각 제공하며, 저항(R18)을 신호 입력단자(T2')는 저항(R19)을 통하여 증폭기(A)에 인가하여서 된 것이다.In a volume control circuit comprising transistors Q 5 -Q 8 as amplifiers and transistors Q 2 -Q 4 as current mirrors, the current mirrors are transistors Q 19 -Q 22 . The reference voltage (V REF ) is applied to the base of the transistor (Q 15 ) emitter, resistor (R 4 ), and the transistor (Q 16 ) for controlling the current mirror, respectively, each transistor (Q 12 ) (Q 15 is a common base, the emitter of transistor Q 16 and the collector of transistor Q 15 are grounded through a common resistor Q 17 , and the regulating power supply terminal T 1 ′ is connected to the transistor Q 11. (Q 13 ), the transistor Q 12 is connected for the voltage drop of transistor Q 11 , and the distribution resistors R 14 (R 15 ) connect the emitter of transistor Q to the contact. The common connection and transistor Q 13 output drive transistor Q 14 to have transistors Q 17 (Q 18 ) with different base polarities. ), Each provided in the base of the dug, a resistance (R 18) a signal input terminal (T 2 ') is a hayeoseo applied to the amplifier (A) through a resistor (R 19).
저항(R11)(R12)(R13)(R16)은 바이어스용, R17은 풀업용이다.Resistor R 11 (R 12 ) (R 13 ) (R 16 ) is for bias and R 17 is for pull up.
IC12는 트랜지스터(Q12)의 콜렉터 전류, VE13은 트랜지스터(Q13)의 이미터 전압, IE16은 트랜지스터(Q1) 이미터 전류이다.IC 12 is the collector current of transistor Q 12 , V E13 is the emitter voltage of transistor Q 13 , and I E16 is the transistor Q 1 emitter current.
이와같이 구성된 회로에서 조절용 전원인가 단자(T1')에 조절용 전원이 인가되지 않을때 트랜지스터(Q1) 오프되고 저항(R14)(R15)에 의하여 기준전압(VREF)이 이미터 전압(VE13)으로 분압되어 있다(Q13은 ON 있다.)In the circuit configured as described above, when the control power supply terminal T 1 ′ is not supplied with the control power supply, the transistor Q 1 is turned off and the reference voltage V REF is changed by the resistor R 14 (R 15 ) to the emitter voltage ( Divided by V E13 ) (Q 13 is ON.)
이때 저항(R14)(R15)으로 분압된 정전압보다 조절용 전원인가단자(T1')의 입력전압이 이미터전압(VE13) 트랜지스터(Q13)의 베이스 이미터간 전압인 VBE13의 전압차보다 높게되면 (즉 대입력 조절을 하기 위하여 용 전원인가 단자(T1')의 전압을 상승시킬때) 트랜지스터(Q13)가 오프되어 오프되어 있던 트랜지스터(Q1) 온 된다.At this time, the input voltage of the control power supply terminal T 1 ′ is higher than the constant voltage divided by the resistors R 14 (R 15 ) and the voltage of V BE13, which is the voltage between the base emitters of the emitter voltage V E13 and transistor Q 13 . When the difference is higher than the difference (that is, when the voltage of the power supply terminal T 1 ′ is raised for large input adjustment), the transistor Q 13 is turned off and the transistor Q 1 that is turned off is turned on.
따라서 트랜지스터(Q17)(Q18)에 바이어스가 걸리게 되어 트랜지스터(Q17)(Q18)가 온 되어져 포화상태에 간다. 트랜지스터(Q17)(Q18)를 등가적으로 나타내면 제 3 도와 같이 표현할 수 있으며 Rx는 등가적으로 나 가변저항을 의미하고 a, b, a', b'는 양단의 노드이다.Therefore, the transistor Q 17 (Q 18 ) is biased, and the transistor Q 17 (Q 18 ) is turned on and goes into a saturation state. Equivalently representing transistors Q 17 and Q 18 can be expressed as a third degree, where R x is equivalently equivalent to variable resistance, and a, b, a ', and b' are nodes at both ends.
또한 가변저항(Rx)과 저항(R18)을 병렬접속한 것에, 신호입력단자(T2')에의 입력신호가 저항(R19)을 통해 공통접속함으로써 증폭기(A)에 인가되도록 표현하여 제 4 도와 같이 나타낼 수 있다.In addition, the variable resistor R x and the resistor R 18 are connected in parallel, so that the input signal to the signal input terminal T 2 ′ is applied to the amplifier A by common connection through the resistor R 19 . It can be expressed as the fourth degree.
따라서 실제입력의 크기는 R19/(Rx//R18)로 감쇄되는 것이다.Therefore, the actual input size is attenuated to R 19 / (R x // R 18 ).
즉, 입력의 크기를 트랜지스터(Q5)의 직선성내로 줄여서 공급하기 때문에 클리핑을 방지할수 있다.That is, since the size of the input is reduced and supplied within the linearity of the transistor Q 5 , clipping can be prevented.
또한 저입력에서 조절할 경우에는 트랜지스터(Q11)의 베이스 바이어스 전압의 변화로 트랜지스터(Q) 콜렉터 전류(IC12)가 변화하여 트랜지스터(Q16)의 이미터 전류(IE16)는 반대의 특성(IC12α1/IE16)을 갖게되므로 트랜지스터(Q16)의 전류변화로 제 1 도와 같은 조절기능을 갖게 되는 것이다.In addition, when adjusted at a low input, the transistor Q collector current I C12 changes due to a change in the base bias voltage of the transistor Q 11 , so that the emitter current I E16 of the transistor Q 16 has the opposite characteristic ( Since I C12 α1 / I E16 ), the current variation of the transistor Q 16 has the same control function as that of the first degree.
이상과 같이 본 고안은 집적회로화하여 전자음량조절기능을 가질 수 있고 대입력시 발생되는 왜율(트랜지스터의 경우 입력 직선성이 좁음)을 방지하여 줌으로써 청감상태의 개선과 제품의 특성개선에 효과가 있는 것이다.As described above, the present invention can have an electronic volume control function by integrated circuit and prevents distortion (narrow input linearity in the case of transistor) generated during large input, thereby improving the hearing condition and improving the characteristics of the product. It is.
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KR910004456Y1 true KR910004456Y1 (en) | 1991-06-29 |
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