JPS5789116A - Hysteresis comparator - Google Patents

Hysteresis comparator

Info

Publication number
JPS5789116A
JPS5789116A JP16320880A JP16320880A JPS5789116A JP S5789116 A JPS5789116 A JP S5789116A JP 16320880 A JP16320880 A JP 16320880A JP 16320880 A JP16320880 A JP 16320880A JP S5789116 A JPS5789116 A JP S5789116A
Authority
JP
Japan
Prior art keywords
voltage
output
terminal
input
vin
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
JP16320880A
Other languages
Japanese (ja)
Inventor
Tsunemi Gonda
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.)
Nikon Corp
Original Assignee
Nikon Corp
Nippon Kogaku KK
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 Nikon Corp, Nippon Kogaku KK filed Critical Nikon Corp
Priority to JP16320880A priority Critical patent/JPS5789116A/en
Publication of JPS5789116A publication Critical patent/JPS5789116A/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

  • Measurement Of Current Or Voltage (AREA)
  • Control Of Voltage And Current In General (AREA)

Abstract

PURPOSE:To stabilize the hysteresis voltage width of a hysteresis comparator to the change of temperature, by connecting an emitter-follower transistor to the output of an operational amplifier and connecting the emitter output to the noninverse input of the operational amplifier. CONSTITUTION:When +V is applied to a power supply terminal 1, the voltage at a connection 9 between resistances R4 and R5 is equal to +V.R4/(R4+R5) to be referred to as V'z. Then Vref is supplied to a reference terminal 3, and input voltage Vin of an input terminal 2 is successively increased at 0. Thus Vout of an output terminal 4 changes to 0 from Vf with the input voltage V1, and the voltage of a noninverse input terminal (+) of an operational amplifier OP is set at a high level in case the input voltage Vin is lower than V1 to deliver the output of Vf. In this case, a transistor Q has an emitter-follower action and this output is fed back to the OP. The output voltage Vout is kept at 0 although the voltage Vin increase. When the voltage Vin is gradually reduced, the voltage of the terminal (+) of the OP is fixed at the voltage Vref. Then the output of the OP is inverted in the case of Vin/Vref, and the outpt is set at V1.
JP16320880A 1980-11-21 1980-11-21 Hysteresis comparator Pending JPS5789116A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16320880A JPS5789116A (en) 1980-11-21 1980-11-21 Hysteresis comparator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16320880A JPS5789116A (en) 1980-11-21 1980-11-21 Hysteresis comparator

Publications (1)

Publication Number Publication Date
JPS5789116A true JPS5789116A (en) 1982-06-03

Family

ID=15769338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16320880A Pending JPS5789116A (en) 1980-11-21 1980-11-21 Hysteresis comparator

Country Status (1)

Country Link
JP (1) JPS5789116A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4920309A (en) * 1989-03-24 1990-04-24 National Semiconductor Corporation Error amplifier for use with parallel operated autonomous current or voltage regulators using transconductance type power amplifiers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4920309A (en) * 1989-03-24 1990-04-24 National Semiconductor Corporation Error amplifier for use with parallel operated autonomous current or voltage regulators using transconductance type power amplifiers

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