JPS5745715A - Schmitt trigger circuit - Google Patents

Schmitt trigger circuit

Info

Publication number
JPS5745715A
JPS5745715A JP55121648A JP12164880A JPS5745715A JP S5745715 A JPS5745715 A JP S5745715A JP 55121648 A JP55121648 A JP 55121648A JP 12164880 A JP12164880 A JP 12164880A JP S5745715 A JPS5745715 A JP S5745715A
Authority
JP
Japan
Prior art keywords
voltage
input signal
base
terminal
level
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
JP55121648A
Other languages
Japanese (ja)
Inventor
Yoki Nakakoji
Koichi Yamada
Kunitoshi Aono
Tadashi Yoshino
Shinji Okada
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP55121648A priority Critical patent/JPS5745715A/en
Publication of JPS5745715A publication Critical patent/JPS5745715A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
    • H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
    • H03K3/2893—Bistables with hysteresis, e.g. Schmitt trigger
    • H03K3/2897—Bistables with hysteresis, e.g. Schmitt trigger with an input circuit of differential configuration

Abstract

PURPOSE:To enable the operation with a minute input signal and to provide stable hysteresis function, by the constitution that the relation among the 1st-3rd bias voltages V1-V3 is as V1>V2>V3. CONSTITUTION:A signal V1 inputted from an input signal terminal 7 is multiplied by a gain and inputted to the base 2 of a transistor (TR)2. When no input signal vi comes from the input terminal 7, a voltage at an output terminal 20 is increased to the V1. When the bias voltage of the TR2 reaches the V1 with the input signal higher than the voltage V2 at the base of the TR2 through the input signal vi, a voltage of an output terminal 20 is at 0 level and it is kept even if the voltage level of the base of the TR2 decreases to the V4. When the input signal level decreases the base voltage of the TR2 is lowered to the V3, the voltage at the terminal 20 increases to the V1 and this operation is repeated.
JP55121648A 1980-09-01 1980-09-01 Schmitt trigger circuit Pending JPS5745715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55121648A JPS5745715A (en) 1980-09-01 1980-09-01 Schmitt trigger circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55121648A JPS5745715A (en) 1980-09-01 1980-09-01 Schmitt trigger circuit

Publications (1)

Publication Number Publication Date
JPS5745715A true JPS5745715A (en) 1982-03-15

Family

ID=14816448

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55121648A Pending JPS5745715A (en) 1980-09-01 1980-09-01 Schmitt trigger circuit

Country Status (1)

Country Link
JP (1) JPS5745715A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5960368A (en) * 1982-09-30 1984-04-06 Matsushita Electric Works Ltd Control circuit for emergency lamp
JPS62105506A (en) * 1985-11-01 1987-05-16 Mitsumi Electric Co Ltd Signal detecting circuit
JPH02187927A (en) * 1989-01-13 1990-07-24 Matsushita Electric Ind Co Ltd Optical disk device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS535910A (en) * 1976-07-06 1978-01-19 Nippon Signal Co Ltd:The Signal detecting circuit
JPS5346660A (en) * 1976-10-09 1978-04-26 Funai Electric Co Engaging members

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS535910A (en) * 1976-07-06 1978-01-19 Nippon Signal Co Ltd:The Signal detecting circuit
JPS5346660A (en) * 1976-10-09 1978-04-26 Funai Electric Co Engaging members

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5960368A (en) * 1982-09-30 1984-04-06 Matsushita Electric Works Ltd Control circuit for emergency lamp
JPS62105506A (en) * 1985-11-01 1987-05-16 Mitsumi Electric Co Ltd Signal detecting circuit
JPH0368571B2 (en) * 1985-11-01 1991-10-29 Mitsumi Electric Co
JPH02187927A (en) * 1989-01-13 1990-07-24 Matsushita Electric Ind Co Ltd Optical disk device

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