JPS57185708A - Amplifying circuit - Google Patents

Amplifying circuit

Info

Publication number
JPS57185708A
JPS57185708A JP56069451A JP6945181A JPS57185708A JP S57185708 A JPS57185708 A JP S57185708A JP 56069451 A JP56069451 A JP 56069451A JP 6945181 A JP6945181 A JP 6945181A JP S57185708 A JPS57185708 A JP S57185708A
Authority
JP
Japan
Prior art keywords
circuit
outputted
capacitor
signal
noninverting
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
JP56069451A
Other languages
Japanese (ja)
Inventor
Takashi Furuhata
Yuhei Abe
Yasuhei Nakama
Kenji Sato
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 JP56069451A priority Critical patent/JPS57185708A/en
Publication of JPS57185708A publication Critical patent/JPS57185708A/en
Pending legal-status Critical Current

Links

Landscapes

  • Manipulation Of Pulses (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: To make noise rejection for increased S/N, by amplifying only the vicinity of the peak level of an input signal, through a negative feedback noninverting amplification of a differential amplifying circuit.
CONSTITUTION: An input signal A is noninverting-amplified at a circuit 10. When a positive peak signal is outputted from the circuit 10, a transistor (TR)Q turns on at the peak level Vp and a capacitor C2 is instantly charged. If an output from the circuit 10 is lowered, the base and emitter of the TRQ is reverse- biased and the TRQ turns off. The charge/discharge of the capacitor C2 is repetitively made in the period when the positive peak signal is outputted from the ciruit 10. The output signal of the circuit 10 is applied to a noninverting input terminal of a circuit 20 of the next stage and the terminal voltage of the capacitor C2 is applied to the inverting input terminal. As a result, the output signals at prescribed level or over from the circuit 10 can be outputted from the circuit 20.
COPYRIGHT: (C)1982,JPO&Japio
JP56069451A 1981-05-11 1981-05-11 Amplifying circuit Pending JPS57185708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56069451A JPS57185708A (en) 1981-05-11 1981-05-11 Amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56069451A JPS57185708A (en) 1981-05-11 1981-05-11 Amplifying circuit

Publications (1)

Publication Number Publication Date
JPS57185708A true JPS57185708A (en) 1982-11-16

Family

ID=13403012

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56069451A Pending JPS57185708A (en) 1981-05-11 1981-05-11 Amplifying circuit

Country Status (1)

Country Link
JP (1) JPS57185708A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH037418A (en) * 1989-06-05 1991-01-14 Matsushita Electric Ind Co Ltd Negative feedback differential amplifier circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5494263A (en) * 1978-01-10 1979-07-25 Meidensha Electric Mfg Co Ltd Wave shaping circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5494263A (en) * 1978-01-10 1979-07-25 Meidensha Electric Mfg Co Ltd Wave shaping circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH037418A (en) * 1989-06-05 1991-01-14 Matsushita Electric Ind Co Ltd Negative feedback differential amplifier circuit

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