JPS5518117A - Schmitt circuit - Google Patents

Schmitt circuit

Info

Publication number
JPS5518117A
JPS5518117A JP9047078A JP9047078A JPS5518117A JP S5518117 A JPS5518117 A JP S5518117A JP 9047078 A JP9047078 A JP 9047078A JP 9047078 A JP9047078 A JP 9047078A JP S5518117 A JPS5518117 A JP S5518117A
Authority
JP
Japan
Prior art keywords
vcc
voltage
output
emitter
secured
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
JP9047078A
Other languages
Japanese (ja)
Inventor
Kunio Seki
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 JP9047078A priority Critical patent/JPS5518117A/en
Publication of JPS5518117A publication Critical patent/JPS5518117A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)
  • Manipulation Of Pulses (AREA)
  • Logic Circuits (AREA)

Abstract

PURPOSE:To lower the output voltage especially at the time of the low level for the schmitt circuit featuring the emitters connected in common, by obtaining the output from the emitter resistance circuit. CONSTITUTION:When the input voltage features a low level less than the sum value of the common emitter voltage and threshold level VBEQ1, transistor Q1 is off with Q2 turned on. And the output voltage features almost R4/(R1 R2+R3+R4). VCC. When the input voltage exceeds the sum of the emitter voltage and VBEQ1, Q1 is turned on with Q2 turned off. If R1>R2 is secured, a positive feedback loop is secured between the current increment due to the ON of Q1 and the current decrement due to the OFF of Q2. Thus the output voltage under the steady state features as R4/(R1+R3+R4).VCC. In this case, the relation of R4/(R1 +R2+ R3+R4).VCC>VBEQ3>R4/(R1+R3+R4).VCC is secured between the output voltage and threshold level VBEQ3 of driving transistor Q3. As a result, the driving transistor can be driven directly by the output given from the emitter side.
JP9047078A 1978-07-26 1978-07-26 Schmitt circuit Pending JPS5518117A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9047078A JPS5518117A (en) 1978-07-26 1978-07-26 Schmitt circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9047078A JPS5518117A (en) 1978-07-26 1978-07-26 Schmitt circuit

Publications (1)

Publication Number Publication Date
JPS5518117A true JPS5518117A (en) 1980-02-08

Family

ID=13999474

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9047078A Pending JPS5518117A (en) 1978-07-26 1978-07-26 Schmitt circuit

Country Status (1)

Country Link
JP (1) JPS5518117A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2486670C1 (en) * 2012-04-27 2013-06-27 Закрытое акционерное общество "Научно-производственный центр "Промэлектроника" (ЗАО "НПЦ "Промэлектроника") Electronic hysteresis device
RU2486669C1 (en) * 2012-03-23 2013-06-27 Закрытое акционерное общество "Научно-производственный центр "Промэлектроника" (ЗАО "НПЦ "Промэлектроника") Electronic hysteresis device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MODERN DIGITAL CIRCUITS *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2486669C1 (en) * 2012-03-23 2013-06-27 Закрытое акционерное общество "Научно-производственный центр "Промэлектроника" (ЗАО "НПЦ "Промэлектроника") Electronic hysteresis device
RU2486670C1 (en) * 2012-04-27 2013-06-27 Закрытое акционерное общество "Научно-производственный центр "Промэлектроника" (ЗАО "НПЦ "Промэлектроника") Electronic hysteresis device

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