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JPS5689111A - Transistor circuit - Google Patents

Transistor circuit

Info

Publication number
JPS5689111A
JPS5689111A JP16556479A JP16556479A JPS5689111A JP S5689111 A JPS5689111 A JP S5689111A JP 16556479 A JP16556479 A JP 16556479A JP 16556479 A JP16556479 A JP 16556479A JP S5689111 A JPS5689111 A JP S5689111A
Authority
JP
Japan
Prior art keywords
voltage
base
collector
transistor
trq2
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
JP16556479A
Other languages
Japanese (ja)
Inventor
Shigeaki Minamibata
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 JP16556479A priority Critical patent/JPS5689111A/en
Publication of JPS5689111A publication Critical patent/JPS5689111A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control

Landscapes

  • Television Receiver Circuits (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To prevent saturation of the output transistor, by applying a control signal of level-shifted DC voltage to the emitter of the transistor to which the collector output of the output transistor is input. CONSTITUTION:npn Transistor TRQ3, to the base of which the collector output of transistor TRQ2 is applied, which has the collector connected to prescribed power supply terminal VCC, diode D1 which shifts the level of DC voltage control signal VB applied to the base of TRQ2, and resistance R3 are provided. Since the voltage between the base and the collector of TRQ2 is not biased forward to the approximately same potential or more by the voltage between the base and the emitter of TRQ3 and the threshold voltage of diode D1, the saturation operation where the voltage between the collector and the base of TRQ2 is biased forward is prevented.
JP16556479A 1979-12-21 1979-12-21 Transistor circuit Pending JPS5689111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16556479A JPS5689111A (en) 1979-12-21 1979-12-21 Transistor circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16556479A JPS5689111A (en) 1979-12-21 1979-12-21 Transistor circuit

Publications (1)

Publication Number Publication Date
JPS5689111A true JPS5689111A (en) 1981-07-20

Family

ID=15814752

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16556479A Pending JPS5689111A (en) 1979-12-21 1979-12-21 Transistor circuit

Country Status (1)

Country Link
JP (1) JPS5689111A (en)

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