JPS5478958A - Negative feedback amplifier - Google Patents

Negative feedback amplifier

Info

Publication number
JPS5478958A
JPS5478958A JP14836377A JP14836377A JPS5478958A JP S5478958 A JPS5478958 A JP S5478958A JP 14836377 A JP14836377 A JP 14836377A JP 14836377 A JP14836377 A JP 14836377A JP S5478958 A JPS5478958 A JP S5478958A
Authority
JP
Japan
Prior art keywords
voltage
circuit
middle point
increased
amplifying circuit
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
JP14836377A
Other languages
Japanese (ja)
Inventor
Toshihiko Sugiura
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP14836377A priority Critical patent/JPS5478958A/en
Publication of JPS5478958A publication Critical patent/JPS5478958A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor

Abstract

PURPOSE:To improve the frequency response at ultra low frequency region, by providing the AC feedback path and DC feedback path separately in the amplifier having the differential amplifying circuit at the pre-stage and SEPP amplifying circuit at the post stage. CONSTITUTION:The signal fed to the terminal 10 is amplified with the differential amplifying circuit 11, in single end push pull SEPP amplification 14, and it is fed to the load 20 from the output middle point A. Simultaneously, it is negative feedbacked to the base of the transistor Tr13 of the circuit 11 via the AC negative feedback circuit 22. Capacitor 31 is provided to avoid DC component from being flowed to the circuit 22. If the DC voltage at the output middle point A is changed toward positive, the base voltage of Tr26 is increased via the AC rejecting filter 25, Tr26 is conductive, and the base voltage of Tr13 is increased, and the conduction of Tr13 is lowered. Accordingly, the conduction of Tr15, 18, 19 is increased, the voltage at the output middle point A is lowered, the DC voltage variation toward positive is compensated, and the amplifier stable to the ultra low frequency region can be established.
JP14836377A 1977-12-06 1977-12-06 Negative feedback amplifier Pending JPS5478958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14836377A JPS5478958A (en) 1977-12-06 1977-12-06 Negative feedback amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14836377A JPS5478958A (en) 1977-12-06 1977-12-06 Negative feedback amplifier

Publications (1)

Publication Number Publication Date
JPS5478958A true JPS5478958A (en) 1979-06-23

Family

ID=15451079

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14836377A Pending JPS5478958A (en) 1977-12-06 1977-12-06 Negative feedback amplifier

Country Status (1)

Country Link
JP (1) JPS5478958A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61145942A (en) * 1984-12-17 1986-07-03 ハネウエル・インコーポレーテッド Drive circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61145942A (en) * 1984-12-17 1986-07-03 ハネウエル・インコーポレーテッド Drive circuit

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