GB656692A - Improvements in or relating to electric trigger circuits employing semi-conductors - Google Patents

Improvements in or relating to electric trigger circuits employing semi-conductors

Info

Publication number
GB656692A
GB656692A GB2789448A GB2789448A GB656692A GB 656692 A GB656692 A GB 656692A GB 2789448 A GB2789448 A GB 2789448A GB 2789448 A GB2789448 A GB 2789448A GB 656692 A GB656692 A GB 656692A
Authority
GB
United Kingdom
Prior art keywords
input
circuit
electrode
output
pulse
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
GB2789448A
Inventor
Alec Harley Reeves
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2789448A priority Critical patent/GB656692A/en
Priority to FR1004663D priority patent/FR1004663A/en
Priority to FR60549D priority patent/FR60549E/en
Publication of GB656692A publication Critical patent/GB656692A/en
Priority to FR64645D priority patent/FR64645E/en
Priority to FR66575D priority patent/FR66575E/en
Priority to FR66895D priority patent/FR66895E/en
Priority to FR67151D priority patent/FR67151E/en
Priority to FR67181D priority patent/FR67181E/en
Expired 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
    • H03K3/26—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
    • H03K3/30—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 a transformer for feedback, e.g. blocking oscillator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Electronic Switches (AREA)

Abstract

656,692. Calculating. STANDARD TELEPHONES & CABLES, Ltd. Oct. 27, 1948, No. 27894. [Class 106 (i)] [Also in Groups XXXIX and XL (c)] In an electric trigger circuit comprising a crystal triode the input and output circuits are coupled to produce positive feed-back so that the circuit has two different current conditions at least one of which is stable. An input pulse is applied to switch the circuit from the low to the high current condition or vice versa and an output pulse is derived from the crystal triode. Fig. 4 shows a trigger circuit in which the crystal triode, Figs. 1 and 2, may consist of a germanium crystal 1 attached to a base electrode 3 with an emitter electrode 4 and a collector electrode 5. Since there is no phase shift between the input and output circuits resistor 6 produces positive feed-back and the bias of the input electrode 4 with respect to the base 3 may be adjusted so that the circuit is stable at either or both of the low and high current points shown at A and B respectively in Fig. 3. If the bias voltages of sources 7 and 8 are adjusted to make the electrodes 4 and 5 positive and negative respectively in relation to electrode 3 then a positive input pulse at terminal 9 will switch the circuit from state A to state B of Fig. 3 and a negative input pulse will revert to circuit to its original state, an output pulse being taken from terminal 11. The circuit may thus function as a trigger pair circuit. Fig. 8 shows a crystal triode used in a pulse frequency divider or binary counting chain. An input train of regularly recurring pulses is applied to the input 43, 44 of a trigger circuit as described in connection with Fig. 4 so that output pulses of half the input repetition frequency are produced at the output electrode 5. These are differentiated by the network 49, 50 and applied to the biassed crystal triode buffer stage 47 which responds only to the positive going differentiated pulses whose amplitude exceeds a given level so that a train of positive going output pulses is obtained at 56, 57 having a repetition frequency half that of the input train. A number of such circuits may be connected in tandem with or without the buffer stages 47 to produce a binary counting chain.
GB2789448A 1948-10-27 1948-10-27 Improvements in or relating to electric trigger circuits employing semi-conductors Expired GB656692A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB2789448A GB656692A (en) 1948-10-27 1948-10-27 Improvements in or relating to electric trigger circuits employing semi-conductors
FR1004663D FR1004663A (en) 1948-10-27 1949-12-22 Trigger circuits using semiconductors
FR60549D FR60549E (en) 1948-10-27 1949-12-29 Trigger circuits using semiconductors
FR64645D FR64645E (en) 1948-10-27 1952-10-09 Trigger circuits using semiconductors
FR66575D FR66575E (en) 1948-10-27 1954-05-20 Trigger circuits using semiconductors
FR66895D FR66895E (en) 1948-10-27 1954-06-10 Trigger circuits using semiconductors
FR67151D FR67151E (en) 1948-10-27 1954-07-20 Trigger circuits using semiconductors
FR67181D FR67181E (en) 1948-10-27 1954-09-23 Trigger circuits using semiconductors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2789448A GB656692A (en) 1948-10-27 1948-10-27 Improvements in or relating to electric trigger circuits employing semi-conductors

Publications (1)

Publication Number Publication Date
GB656692A true GB656692A (en) 1951-08-29

Family

ID=10266997

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2789448A Expired GB656692A (en) 1948-10-27 1948-10-27 Improvements in or relating to electric trigger circuits employing semi-conductors

Country Status (1)

Country Link
GB (1) GB656692A (en)

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