GB1076072A - Electrical signal-level detector - Google Patents

Electrical signal-level detector

Info

Publication number
GB1076072A
GB1076072A GB1061965A GB1061965A GB1076072A GB 1076072 A GB1076072 A GB 1076072A GB 1061965 A GB1061965 A GB 1061965A GB 1061965 A GB1061965 A GB 1061965A GB 1076072 A GB1076072 A GB 1076072A
Authority
GB
United Kingdom
Prior art keywords
signal
unidirectional
threshold
input signal
level detector
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.)
Expired
Application number
GB1061965A
Inventor
William Alan Cowin
Ronald Philip Carter
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.)
English Electric Co Ltd
Original Assignee
English 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 English Electric Co Ltd filed Critical English Electric Co Ltd
Priority to GB1061965A priority Critical patent/GB1076072A/en
Priority to CH335966A priority patent/CH455034A/en
Publication of GB1076072A publication Critical patent/GB1076072A/en
Priority to JP9054768U priority patent/JPS447269Y1/ja
Expired 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
    • G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

1,076,072. Signal level detector. ENGLISH ELECTRIC CO. March 11, 1966 [March 12, 1965], No. 10619/65. Heading H3T. [Also in Division H2] A signal level detector comprises means for producing from an alternating input signal a unidirectional cyclically varying signal having maximum and minimum values proportional to the peak value of the alternating input signal, and a switching device to which the unidirectional signal is applied, which device assumes one state upon the maximum value exceeding a first threshold and a second state upon the minimum value falling below a second threshold. The unidirectional signal is formed by the combination of a full-wave rectified version of the input signal, provided by diodes 8, 9 and a similar signal of 90 degrees phase difference obtained from phase-shift circuit 10-13 and full-wave rectifier 14, 15. The signal is then applied to Schmitt trigger 17, which circuit has unequal collector load resistors 20, 21, so that transistor 18 is switchedoff when the maximum of the unidirectional signal exceeds a first threshold, and is not turned on until the minimum falls below a second, lower threshold. The diodes 8, 9, 14, 15 may be replaced by transistors connected in emitter-follower configuration (Fig. 3, not shown). A polyphase input signal may be employed, in which case the phase-shift network is dispensed with, since the rectified input will have the cyclic form necessary.
GB1061965A 1965-03-12 1965-03-12 Electrical signal-level detector Expired GB1076072A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1061965A GB1076072A (en) 1965-03-12 1965-03-12 Electrical signal-level detector
CH335966A CH455034A (en) 1965-03-12 1966-03-09 Electrical signal level detector
JP9054768U JPS447269Y1 (en) 1965-03-12 1968-10-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1061965A GB1076072A (en) 1965-03-12 1965-03-12 Electrical signal-level detector

Publications (1)

Publication Number Publication Date
GB1076072A true GB1076072A (en) 1967-07-19

Family

ID=9971203

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1061965A Expired GB1076072A (en) 1965-03-12 1965-03-12 Electrical signal-level detector

Country Status (3)

Country Link
JP (1) JPS447269Y1 (en)
CH (1) CH455034A (en)
GB (1) GB1076072A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2227991A1 (en) * 1971-06-08 1973-01-04 Rca Corp DETECTOR CIRCUIT

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56156331U (en) * 1980-04-21 1981-11-21
JPS61195363A (en) * 1985-02-26 1986-08-29 Toshiba Corp Deficit voltage detection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2227991A1 (en) * 1971-06-08 1973-01-04 Rca Corp DETECTOR CIRCUIT

Also Published As

Publication number Publication date
CH455034A (en) 1968-04-30
JPS447269Y1 (en) 1969-03-18

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