JPS5780823A - Schmitt trigger circuit - Google Patents

Schmitt trigger circuit

Info

Publication number
JPS5780823A
JPS5780823A JP55156717A JP15671780A JPS5780823A JP S5780823 A JPS5780823 A JP S5780823A JP 55156717 A JP55156717 A JP 55156717A JP 15671780 A JP15671780 A JP 15671780A JP S5780823 A JPS5780823 A JP S5780823A
Authority
JP
Japan
Prior art keywords
transistor
differential
stage
transistors
current source
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
JP55156717A
Other languages
Japanese (ja)
Inventor
Hiroshi Takahashi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55156717A priority Critical patent/JPS5780823A/en
Publication of JPS5780823A publication Critical patent/JPS5780823A/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
    • H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
    • H03K3/0233—Bistable circuits
    • H03K3/02337—Bistables with hysteresis, e.g. Schmitt trigger

Landscapes

  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To make the hysteresis width constant and suppress the fluctuation of the input state due to an input level, by constituting a circuit by an input-stage transistor, differential-stage transistors, current sources, and a resistance. CONSTITUTION:The emitter of an input-stage transistor Q1 is connected to a current source I1 and the base of a differential-stage transistor Q2, and the emitter of a transistor Q4 is connected to a current source I 3 and the base of a differential-stage transistor Q3 through a resistance R2 for hysteresis. A current source I2 is connected to the common emitter connection point of differential- stage transistors Q2 and Q3, and a detecting circuit 11 to detect turning-on and off states pf transistors Q2 and Q3 is connected to collectors of transistors Q2 and Q3. A current source I4 is connected to the base of the transistor Q3 through a switch SW1.
JP55156717A 1980-11-07 1980-11-07 Schmitt trigger circuit Pending JPS5780823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55156717A JPS5780823A (en) 1980-11-07 1980-11-07 Schmitt trigger circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55156717A JPS5780823A (en) 1980-11-07 1980-11-07 Schmitt trigger circuit

Publications (1)

Publication Number Publication Date
JPS5780823A true JPS5780823A (en) 1982-05-20

Family

ID=15633790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55156717A Pending JPS5780823A (en) 1980-11-07 1980-11-07 Schmitt trigger circuit

Country Status (1)

Country Link
JP (1) JPS5780823A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6182521A (en) * 1984-09-29 1986-04-26 Toshiba Corp Differential type comparator circuit
JPS61263306A (en) * 1985-05-17 1986-11-21 Matsushita Electric Ind Co Ltd Hysteresis comparator circuit
JPS6221319A (en) * 1985-07-22 1987-01-29 New Japan Radio Co Ltd Hysteresis comparator
JPH01138467A (en) * 1987-11-25 1989-05-31 Mitsubishi Electric Corp Voltage comparison device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6182521A (en) * 1984-09-29 1986-04-26 Toshiba Corp Differential type comparator circuit
JPS61263306A (en) * 1985-05-17 1986-11-21 Matsushita Electric Ind Co Ltd Hysteresis comparator circuit
JPS6221319A (en) * 1985-07-22 1987-01-29 New Japan Radio Co Ltd Hysteresis comparator
JPH01138467A (en) * 1987-11-25 1989-05-31 Mitsubishi Electric Corp Voltage comparison device

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