KR950010342A - Amplifier Gain Control Circuit Through Impedance Control - Google Patents

Amplifier Gain Control Circuit Through Impedance Control Download PDF

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Publication number
KR950010342A
KR950010342A KR1019930019137A KR930019137A KR950010342A KR 950010342 A KR950010342 A KR 950010342A KR 1019930019137 A KR1019930019137 A KR 1019930019137A KR 930019137 A KR930019137 A KR 930019137A KR 950010342 A KR950010342 A KR 950010342A
Authority
KR
South Korea
Prior art keywords
inverting amplifier
terminal
amplifier
output
control circuit
Prior art date
Application number
KR1019930019137A
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Korean (ko)
Other versions
KR960013042B1 (en
Inventor
김명호
Original Assignee
배순훈
대우전자 주식회사
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Publication date
Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019930019137A priority Critical patent/KR960013042B1/en
Publication of KR950010342A publication Critical patent/KR950010342A/en
Application granted granted Critical
Publication of KR960013042B1 publication Critical patent/KR960013042B1/en

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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
    • H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/004—Control by varying the supply voltage

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  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

본 발명은 반전 증폭기에 관한 것으로서, 더욱 상세하게는 반전 증폭기 입력단에 연결된 저항값을 변환시켜 반전 증폭기의 이득을 조절할 수 있도록 한 임피이던스 제어를 퉁한 앰프 이득 제어회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverting amplifier, and more particularly, to an amplifier gain control circuit with impedance control to adjust a gain of an inverting amplifier by converting a resistance value connected to an inverting amplifier input terminal.

일반적으로 반전 증폭기에 있어서는 반전 증폭기의 입력단에 연결된 저항과 반전 중폭기의 입력단과 출력단 사이에 연결되어진 저항의 저항값에 따라 증폭률이 결정되어져 반전 증폭기의 증폭률을 조정하기 위해서는 상기 저항의 저항값을 달리 설정하거나 반전 증폭기에 입력하는 입력 전압 자체를 변환시켜야만 하는 번거로움이 있었다.In general, in the inverting amplifier, the amplification factor is determined according to the resistance value of the resistor connected to the input terminal of the inverting amplifier and the resistance connected between the input terminal and the output terminal of the inverting heavy amplifier. The hassle of having to set or convert the input voltage itself into the inverting amplifier.

따라서 본 발명은 이를 개선하기 위하여 제1도에서와 같이 반전 증폭기의 입력단에 별도의 저항(R5)을 연결시키고 상기 저항(R5)에는 기준 레벨간과 교류/직류 변환기(25)의 출력을 비교한 비교기(CP)의 출력 레벨에 따라 구동하는 스위칭 소자(SW)를 연결하여 상기 스위칭 소자(SW)의 일단에는 증폭률을 달리하는 반전 증폭기(A1)의 출력이 인가되도록 구성한 것이다.Therefore, to improve this, the present invention connects a separate resistor R 5 to the input terminal of the inverting amplifier as shown in FIG. 1 and compares the output between the reference level and the AC / DC converter 25 to the resistor R 5 . The switching element SW is driven according to the output level of one comparator CP so that the output of the inverting amplifier A 1 having a different amplification factor is applied to one end of the switching element SW.

Description

임피이던스 제어를 통한 엠프 이득 제어회로Amplifier Gain Control Circuit Through Impedance Control

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명 임피이던스 제어를 통한 앰프 이득 제어회로를 나타낸 회로도이다.1 is a circuit diagram showing an amplifier gain control circuit through the impedance control of the present invention.

Claims (3)

일측 단자(+)가 접지된 반전 증폭기(A2)의 타측 단자(-)에 연결된 저(R3)과 저항(R4)에 의해 증폭률이 결정되어지는 반전 증폭기에 있어서, 상기 반전 증폭기(A2)의 타측 단자(-)에 병렬 연결된 저항(R5)의 일단에 스위칭 소자(SW)를 구성시키고 상기 스위칭 소자(SW)의 구동이 타측 단자(-)에 기준 전압(Rref)이 인가되어지고 일측 단자(+)에 교류/직류 변환기(25)를 통한 신호 입력부(15)의 입력이 인가되는 비교기(CP)의 출력 레벨에 따라 결정 되어짐을 특징으로 하는 임피이던스 제어를 통한 엠프 이득 제어회로.In the inverting amplifier in which the amplification factor is determined by the low (R 3 ) and the resistance (R 4 ) connected to the other terminal (-) of the inverting amplifier (A 2 ) where one terminal (+) is grounded, the inverting amplifier (A) 2 ) the switching element SW is configured at one end of the resistor R 5 connected in parallel to the other terminal (−) of the second terminal, and the driving of the switching element SW is applied with the reference voltage Rref to the other terminal (−). The amplifier gain control circuit through the impedance control, characterized in that the input of the signal input unit 15 through the AC / DC converter 25 to the one terminal (+) is determined according to the output level of the comparator (CP). 제 1항에 있어서, 스위칭 소자(SW)의 일단에 반전 증폭기(A1)의 출력단을 연결시키되, 상기 반전 증폭기(A1)의 일측 단자(+)는 접지시키고, 타측 단자(-)에는 저항(R1) 및 반고정저항(VR)을 통한 신호 입력부(15)의 입력을 인가시키며, 상기 반전 증폭기(A2)의 타측 단자(-)와 출력단 사이에는 가변저항(△R)을 연결시켜 구성함을 특징으로 하는 임피이던스 제어를 통한 엠프 이득 제어회로.According to claim 1 , The output terminal of the inverting amplifier (A 1 ) is connected to one end of the switching element (SW), one terminal (+) of the inverting amplifier (A 1 ) is grounded, the other terminal (-) The input of the signal input unit 15 through the (R 1 ) and the semi-fixed resistor (VR) is applied, and the variable resistor (ΔR) is connected between the other terminal (-) and the output terminal of the inverting amplifier (A 2 ) Amplifier gain control circuit through the impedance control, characterized in that the configuration. 제1항에 있어서, 가변저항(△R) 양단에는 교류/직류 변환기(25)의 출력과 정전류원(35)이 연결되어짐을 특징으로 하는 임피이던스 제어를 통한 엠프 이득 제어회로.2. The amplifier gain control circuit according to claim 1, wherein an output of the AC / DC converter (25) is connected to a constant current source (35) at both ends of the variable resistor (ΔR). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930019137A 1993-09-21 1993-09-21 Amp gain control circuit using impedance control KR960013042B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930019137A KR960013042B1 (en) 1993-09-21 1993-09-21 Amp gain control circuit using impedance control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930019137A KR960013042B1 (en) 1993-09-21 1993-09-21 Amp gain control circuit using impedance control

Publications (2)

Publication Number Publication Date
KR950010342A true KR950010342A (en) 1995-04-28
KR960013042B1 KR960013042B1 (en) 1996-09-25

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ID=19364103

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019930019137A KR960013042B1 (en) 1993-09-21 1993-09-21 Amp gain control circuit using impedance control

Country Status (1)

Country Link
KR (1) KR960013042B1 (en)

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Publication number Publication date
KR960013042B1 (en) 1996-09-25

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