JPS5630320A - Using method of differential amplifier - Google Patents

Using method of differential amplifier

Info

Publication number
JPS5630320A
JPS5630320A JP10572279A JP10572279A JPS5630320A JP S5630320 A JPS5630320 A JP S5630320A JP 10572279 A JP10572279 A JP 10572279A JP 10572279 A JP10572279 A JP 10572279A JP S5630320 A JPS5630320 A JP S5630320A
Authority
JP
Japan
Prior art keywords
differential amplifier
input signal
terminal
open
window comparator
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
JP10572279A
Other languages
Japanese (ja)
Inventor
Hidetaka Saegusa
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.)
Nippon Signal Co Ltd
Original Assignee
Nippon Signal 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 Nippon Signal Co Ltd filed Critical Nippon Signal Co Ltd
Priority to JP10572279A priority Critical patent/JPS5630320A/en
Publication of JPS5630320A publication Critical patent/JPS5630320A/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
    • G01R19/1659—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 to indicate that the value is within or outside a predetermined range of values (window)

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manipulation Of Pulses (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To provide the fail-safe function by using a differential amplifier as a window comparator. CONSTITUTION:By way of rectifying, smoothing circuit Re, AC input signal (s) is supplied to one input terminal i1 of window comparator WC composed of a differential amplifier and AC Schmitt circuit Sh is connected to output terminal (o), judging whether the amplitude value of the AC input signal is within the range set by reference DC voltage Vref supplied to the other input terminal i2. When a constituent component gets out of order, (1) input signal is interrupted halfway in the circuit according to respective fault modes, namely, when R1-R5 are opne, when terminals of transistors TR1 and TR2 are open to each other or shorted, or when the electric power terminal is open or held at OV, (2) the amplification factor of differential amplifier decreases. Thus the output level decreases, entailing an asymmetric fault mode.
JP10572279A 1979-08-20 1979-08-20 Using method of differential amplifier Pending JPS5630320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10572279A JPS5630320A (en) 1979-08-20 1979-08-20 Using method of differential amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10572279A JPS5630320A (en) 1979-08-20 1979-08-20 Using method of differential amplifier

Publications (1)

Publication Number Publication Date
JPS5630320A true JPS5630320A (en) 1981-03-26

Family

ID=14415208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10572279A Pending JPS5630320A (en) 1979-08-20 1979-08-20 Using method of differential amplifier

Country Status (1)

Country Link
JP (1) JPS5630320A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4928259A (en) * 1972-07-11 1974-03-13
JPS53123059A (en) * 1977-04-01 1978-10-27 Japanese National Railways<Jnr> Using method for differential amplifier circuit
JPS53144641A (en) * 1977-05-23 1978-12-16 Nec Corp Window comparator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4928259A (en) * 1972-07-11 1974-03-13
JPS53123059A (en) * 1977-04-01 1978-10-27 Japanese National Railways<Jnr> Using method for differential amplifier circuit
JPS53144641A (en) * 1977-05-23 1978-12-16 Nec Corp Window comparator

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