JPS54151360A - Schmitt trigger circuit - Google Patents

Schmitt trigger circuit

Info

Publication number
JPS54151360A
JPS54151360A JP4296178A JP4296178A JPS54151360A JP S54151360 A JPS54151360 A JP S54151360A JP 4296178 A JP4296178 A JP 4296178A JP 4296178 A JP4296178 A JP 4296178A JP S54151360 A JPS54151360 A JP S54151360A
Authority
JP
Japan
Prior art keywords
input
voltage
terminal
diodes
constituting
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.)
Granted
Application number
JP4296178A
Other languages
Japanese (ja)
Other versions
JPS5842969B2 (en
Inventor
Masaaki Tanioka
Yukio Miyazaki
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP53042961A priority Critical patent/JPS5842969B2/en
Publication of JPS54151360A publication Critical patent/JPS54151360A/en
Publication of JPS5842969B2 publication Critical patent/JPS5842969B2/en
Expired 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)

Abstract

PURPOSE:To obtain high input impedance and to enable to set small hysteresis width with good accuracy, by constituting the input stage with differential amplifier and using the hysteresis characteristics with the relation between the forward current and voltage of the diode. CONSTITUTION:When no input is present at the input terminal 14 of the transistors Tr15, 16 constituting the differential amplifier, the output of the terminal 29 is at L with Tr15 off, Tr16 on, and Tr17, 18 off. In this case, the base potential of Tr16 is the sum of the forward voltage of the diodes 24 and 25 to which the currents I1 and I2 of the constant current sources 26, 27 flow, and the positive direction threshold voltage VT is set by this. Next, when the input waveform level of the terminal 14 exceeds VT, Tr15, 17 turn on and then, Tr18 turn on. I2 of the constant current source 27 flows in, and only I1 flows to the diodes 24, 25, the base voltage of Tr16 decreases to set the negative direction threshold voltage VT by this. Thus, the hysteresis width can be set with I1 and I2.
JP53042961A 1978-04-11 1978-04-11 Schmidt trigger circuit Expired JPS5842969B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53042961A JPS5842969B2 (en) 1978-04-11 1978-04-11 Schmidt trigger circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53042961A JPS5842969B2 (en) 1978-04-11 1978-04-11 Schmidt trigger circuit

Publications (2)

Publication Number Publication Date
JPS54151360A true JPS54151360A (en) 1979-11-28
JPS5842969B2 JPS5842969B2 (en) 1983-09-22

Family

ID=12650619

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53042961A Expired JPS5842969B2 (en) 1978-04-11 1978-04-11 Schmidt trigger circuit

Country Status (1)

Country Link
JP (1) JPS5842969B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5711535A (en) * 1980-06-25 1982-01-21 Nec Corp Integrated logical circuit
JPS5726922A (en) * 1980-07-24 1982-02-13 Nec Corp Voltage comparator
JPS57139807U (en) * 1981-02-27 1982-09-01
JPS5960368A (en) * 1982-09-30 1984-04-06 Matsushita Electric Works Ltd Control circuit for emergency lamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01112079U (en) * 1988-01-23 1989-07-27

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5711535A (en) * 1980-06-25 1982-01-21 Nec Corp Integrated logical circuit
JPS6356723B2 (en) * 1980-06-25 1988-11-09 Nippon Electric Co
JPS5726922A (en) * 1980-07-24 1982-02-13 Nec Corp Voltage comparator
JPS57139807U (en) * 1981-02-27 1982-09-01
JPS5960368A (en) * 1982-09-30 1984-04-06 Matsushita Electric Works Ltd Control circuit for emergency lamp

Also Published As

Publication number Publication date
JPS5842969B2 (en) 1983-09-22

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