JPS5745708A - Amplifying circuit - Google Patents

Amplifying circuit

Info

Publication number
JPS5745708A
JPS5745708A JP55121129A JP12112980A JPS5745708A JP S5745708 A JPS5745708 A JP S5745708A JP 55121129 A JP55121129 A JP 55121129A JP 12112980 A JP12112980 A JP 12112980A JP S5745708 A JPS5745708 A JP S5745708A
Authority
JP
Japan
Prior art keywords
gain
high frequency
feedback
circuit
frequency
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
JP55121129A
Other languages
Japanese (ja)
Inventor
Masaru Noda
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 JP55121129A priority Critical patent/JPS5745708A/en
Publication of JPS5745708A publication Critical patent/JPS5745708A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To change a high frequency cut-off frequency in transmission characteristics to a main signal of this circuit system, by negative-feeding back only the high frequency component and changing the closed gain with the gain change of the variable gain amplifying circuit. CONSTITUTION:A main signal to be amplified is applied to an input terminal 2, and the output is fed back to a feedback circuit 5. Since the feedback circuit 5 consists of a polarity inversion amplifier 51 and a high-pass circuit 52, the feedback is a negative feedback, and the amount of feedback is less at a low frequency and much in high frequency. Thus, the frequency characteristics from the input terminal 2 to an output terminal 3 are of high frequency decrease type, and when the gain of a variable gain amplifier 1 is increased, the closed loop gain of the feedback loop is increased, the high frequency drooping characteristics are emphasized, and when the gain of the amplifier 1 is decreased, the high frequency drooping characteristics are weakened.
JP55121129A 1980-09-03 1980-09-03 Amplifying circuit Pending JPS5745708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55121129A JPS5745708A (en) 1980-09-03 1980-09-03 Amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55121129A JPS5745708A (en) 1980-09-03 1980-09-03 Amplifying circuit

Publications (1)

Publication Number Publication Date
JPS5745708A true JPS5745708A (en) 1982-03-15

Family

ID=14803588

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55121129A Pending JPS5745708A (en) 1980-09-03 1980-09-03 Amplifying circuit

Country Status (1)

Country Link
JP (1) JPS5745708A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60258918A (en) * 1985-03-20 1985-12-20 Toshiba Ceramics Co Ltd Manufacture of sic-si heat equalizing tube for manufacturing gas impermeable semiconductor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60258918A (en) * 1985-03-20 1985-12-20 Toshiba Ceramics Co Ltd Manufacture of sic-si heat equalizing tube for manufacturing gas impermeable semiconductor
JPS6220687B2 (en) * 1985-03-20 1987-05-08 Toshiba Ceramics Co

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