GB1136430A - Pulse-width modulation circuit - Google Patents

Pulse-width modulation circuit

Info

Publication number
GB1136430A
GB1136430A GB5693066A GB5693066A GB1136430A GB 1136430 A GB1136430 A GB 1136430A GB 5693066 A GB5693066 A GB 5693066A GB 5693066 A GB5693066 A GB 5693066A GB 1136430 A GB1136430 A GB 1136430A
Authority
GB
United Kingdom
Prior art keywords
transistor
capacitor
supplied
transistors
amplifier
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
GB5693066A
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.)
Duracell Inc USA
Original Assignee
PR Mallory and Co Inc
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 PR Mallory and Co Inc filed Critical PR Mallory and Co Inc
Publication of GB1136430A publication Critical patent/GB1136430A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation
    • 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
    • H03K3/282—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 astable
    • H03K3/2823—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 astable using two active transistor of the same conductivity type

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Pulse Circuits (AREA)
  • Amplifiers (AREA)

Abstract

1,136,430. Pulse modulation circuits; transistor pulse oscillators. P. R. MALLORY & CO. Inc. 20 Dec., 1966 [12 Jan., 1966], No. 56930/66. Headings H3T and H4L. In a circuit for varying the duty-cycle while maintaining constant the repetition rate of the output waveform of a multivibrator 22, 23, Fig. 1, the input signal is supplied to a differential amplifier 11 providing oppositely phased outputs which via diodes 13, 14 control the charging time of capacitors 20, 21 respectively. Alternatively the respective outputs of the amplifier may be supplied to the collectors of the multivibrator transistors, Fig. 2 (not shown). In a further arrangement, Fig. 3, the outputs of the differential amplifier 46 are supplied to the bases of transistors 50, 51 respectively. Assuming that transistor 43 of trigger pair 43, 44 is non-conducting the capacitor 64 will charge via transistor 50 to a level determined by the output of amplifier 46 until transistors 54, 57 conduct. At this time transistor 43 becomes conductive due to the slow linear discharge of capacitor 67 via transistor 69 rendering transis- 60, 62 non-conductive, and the charge voltage is then removed from capacitor 64 which discharges slowly via a transistor 65. Transistor 44 being non-conducting, the capacitor 67 is charged via transistor 51 and the cycle is repeated.
GB5693066A 1966-01-12 1966-12-20 Pulse-width modulation circuit Expired GB1136430A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US52021866A 1966-01-12 1966-01-12

Publications (1)

Publication Number Publication Date
GB1136430A true GB1136430A (en) 1968-12-11

Family

ID=24071663

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5693066A Expired GB1136430A (en) 1966-01-12 1966-12-20 Pulse-width modulation circuit

Country Status (3)

Country Link
DE (1) DE1512305A1 (en)
GB (1) GB1136430A (en)
NL (1) NL6700479A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2554971C3 (en) * 1975-12-06 1981-06-19 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Circuit arrangement for the simultaneous transmission of two pieces of information over one channel

Also Published As

Publication number Publication date
DE1512305A1 (en) 1969-04-03
NL6700479A (en) 1967-07-13

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