JPS5712369A - Voltage comparator - Google Patents

Voltage comparator

Info

Publication number
JPS5712369A
JPS5712369A JP8631380A JP8631380A JPS5712369A JP S5712369 A JPS5712369 A JP S5712369A JP 8631380 A JP8631380 A JP 8631380A JP 8631380 A JP8631380 A JP 8631380A JP S5712369 A JPS5712369 A JP S5712369A
Authority
JP
Japan
Prior art keywords
voltage
hysteresis
voltage comparator
power source
trs
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
JP8631380A
Other languages
Japanese (ja)
Inventor
Yoshikuni Hoshino
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8631380A priority Critical patent/JPS5712369A/en
Publication of JPS5712369A publication Critical patent/JPS5712369A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To obtain a small-hysteresis voltage comparator which is suitably IC- implemented, by generating an offset voltage by varying the operation current ratio of an input differential couple of transistors (TR) of a differential input type voltage comparator according to an output state. CONSTITUTION:A differential input type voltage comparator is composed of pnp TRs Q1 and Q2, npn TRs Q3 and Q4, a constant-current source I0, etc. When a reference voltage VREF is higher than an input voltage VIN, an output VOUT is at a high level and a switch SW stays off. Then, when the VOUT goes to a low level and the switch SW is closed, a current flows from a hysteresis power source IH to the TRQ3. Therefore, then the VOUT goes to the high level again, collector currents of TRs Q1 and Q2 are unbalanced to generate an offset voltage with hysteresis width which corresponds to the voltage VH of the power source IH, thereby adjusting the hysteresis width according to the offset power source without any resistance, etc. As a result, a small hysteresis voltage comparator which is suitably IC-implemented is obtained.
JP8631380A 1980-06-25 1980-06-25 Voltage comparator Pending JPS5712369A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8631380A JPS5712369A (en) 1980-06-25 1980-06-25 Voltage comparator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8631380A JPS5712369A (en) 1980-06-25 1980-06-25 Voltage comparator

Publications (1)

Publication Number Publication Date
JPS5712369A true JPS5712369A (en) 1982-01-22

Family

ID=13883339

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8631380A Pending JPS5712369A (en) 1980-06-25 1980-06-25 Voltage comparator

Country Status (1)

Country Link
JP (1) JPS5712369A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001053840A1 (en) * 2000-01-19 2001-07-26 Koninklijke Philips Electronics N.V. Circuit for voltage level detection
JP2006060692A (en) * 2004-08-23 2006-03-02 Mitsumi Electric Co Ltd Comparator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001053840A1 (en) * 2000-01-19 2001-07-26 Koninklijke Philips Electronics N.V. Circuit for voltage level detection
JP2003520965A (en) * 2000-01-19 2003-07-08 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Voltage level detection circuit
JP2006060692A (en) * 2004-08-23 2006-03-02 Mitsumi Electric Co Ltd Comparator

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