JPH01220509A - Signal suppressing circuit - Google Patents

Signal suppressing circuit

Info

Publication number
JPH01220509A
JPH01220509A JP4518288A JP4518288A JPH01220509A JP H01220509 A JPH01220509 A JP H01220509A JP 4518288 A JP4518288 A JP 4518288A JP 4518288 A JP4518288 A JP 4518288A JP H01220509 A JPH01220509 A JP H01220509A
Authority
JP
Japan
Prior art keywords
transistor
signal
circuit
output
emitter
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
JP4518288A
Other languages
Japanese (ja)
Inventor
Koichi Takasuka
Original Assignee
Matsushita Electric Ind 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 Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Priority to JP4518288A priority Critical patent/JPH01220509A/en
Publication of JPH01220509A publication Critical patent/JPH01220509A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To suppress only a micro noise by converting a part of an output signal corresponding to an arbitrary voltage to a current in a circuit to input a signal to the base of a transistor and to output it from the emitter side, and feeding back it to the output circuit.
CONSTITUTION: A constant current source 31 whose other end is connected to a ground point 35 is provided at the emitter of the transistor 30, and also, a limiter circuit 32 is coupled with a voltagecurrent conversion circuit 33, and its signal is fed back and coupled to the constant current source 31. Also, the collector of the transistor is connected to a power source 34, and the base to an input terminal 36, and the emitter to an output terminal 37. A diode whose anode is connected to the input terminal 30 can be used instead of the transistor 30. Since it is possible to obtain the maximum suppression range from several mV with high accuracy by setting a ratio of the current values of two constant current sources in the limiter circuit, only the micro noise can be suppressed without amplifying an input signal in advance.
COPYRIGHT: (C)1989,JPO&Japio
JP4518288A 1988-02-26 1988-02-26 Signal suppressing circuit Pending JPH01220509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4518288A JPH01220509A (en) 1988-02-26 1988-02-26 Signal suppressing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4518288A JPH01220509A (en) 1988-02-26 1988-02-26 Signal suppressing circuit

Publications (1)

Publication Number Publication Date
JPH01220509A true JPH01220509A (en) 1989-09-04

Family

ID=12712128

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4518288A Pending JPH01220509A (en) 1988-02-26 1988-02-26 Signal suppressing circuit

Country Status (1)

Country Link
JP (1) JPH01220509A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5459786A (en) * 1991-02-19 1995-10-17 Nec Corporation Loudspeaker telephone device comprising a novel noise suppressing circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5459786A (en) * 1991-02-19 1995-10-17 Nec Corporation Loudspeaker telephone device comprising a novel noise suppressing circuit

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