GB742336A - D.c. restoring or clamping circuits - Google Patents

D.c. restoring or clamping circuits

Info

Publication number
GB742336A
GB742336A GB25481/53A GB2548153A GB742336A GB 742336 A GB742336 A GB 742336A GB 25481/53 A GB25481/53 A GB 25481/53A GB 2548153 A GB2548153 A GB 2548153A GB 742336 A GB742336 A GB 742336A
Authority
GB
United Kingdom
Prior art keywords
electrode
grid
group
type
restoring
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
GB25481/53A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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
Priority claimed from US308618A external-priority patent/US2728857A/en
Application filed by RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB742336A publication Critical patent/GB742336A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
    • H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor
    • H03K4/62—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as a switching device
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/68—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors specially adapted for switching ac currents or voltages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
    • H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

742,336. Television. RADIO CORPORATION OF AMERICA. Sept. 15, 1953 [Oct. 1, 1952], No. 25481/53. Addition to 742,134, [Group XL (c)]. Class 40 (3). [Also in Group XL (c)] In a circuit of the type described in the parent Specification one electrode 31 of a symmetrical transistor 20, Fig. 1, is connected to a reference potential and another electrode 35 is connected to a point to be clamped. A negative giving pulse applied to the electrode 33 attached to the N-type central region causes bidirectional flow to occur between the two end P-type regions so that the grid 17 is brought to the potential of the tapping on potentiometer 47. The pulse may conveniently be generated by the line time base circuit (Fig. 2, not shown), and the grid may be that of the C.R.T. In a modification (Fig. 3, not shown), a NPN transistor is employed with appropriate biasing arrangements.
GB25481/53A 1952-09-09 1953-09-15 D.c. restoring or clamping circuits Expired GB742336A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US308618A US2728857A (en) 1952-09-09 1952-09-09 Electronic switching
US742336XA 1952-10-01 1952-10-01

Publications (1)

Publication Number Publication Date
GB742336A true GB742336A (en) 1955-12-21

Family

ID=26755401

Family Applications (2)

Application Number Title Priority Date Filing Date
GB23859/53A Expired GB742134A (en) 1952-09-09 1953-08-28 Control circuit including a semiconducting body
GB25481/53A Expired GB742336A (en) 1952-09-09 1953-09-15 D.c. restoring or clamping circuits

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB23859/53A Expired GB742134A (en) 1952-09-09 1953-08-28 Control circuit including a semiconducting body

Country Status (6)

Country Link
BE (2) BE522540A (en)
CH (2) CH326329A (en)
DE (2) DE1025011B (en)
FR (2) FR1084457A (en)
GB (2) GB742134A (en)
NL (2) NL181210C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001014A (en) * 1958-07-14 1961-09-19 Zenith Radio Corp Synchronizing-signal separator

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1164478B (en) * 1964-03-05 Siemens Ag Electronic circuit arrangement for switching the current direction in a consumer
DE109417C (en) * 1958-06-18
DE1121115B (en) * 1958-11-13 1962-01-04 Telefunken Patent Bipolar electronic switch
DE1208791B (en) * 1962-08-31 1966-01-13 Robotron Corp Switching arrangement with two controlled semiconductor rectifiers
US3268658A (en) * 1963-04-19 1966-08-23 Rca Corp Transistor clamp circuit
DE1227938B (en) * 1964-07-17 1966-11-03 Siemens Ag Circuit arrangement for compensating the residual open circuit voltage in a transistor switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL156301B (en) * 1949-09-30 H Verheij S Machines Nv BREAD MAKING MACHINE.
US2594449A (en) * 1950-12-30 1952-04-29 Bell Telephone Labor Inc Transistor switching device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001014A (en) * 1958-07-14 1961-09-19 Zenith Radio Corp Synchronizing-signal separator

Also Published As

Publication number Publication date
NL181718B (en)
DE1067473B (en) 1959-10-22
FR64684E (en) 1955-12-01
BE522540A (en)
BE523133A (en)
FR1084457A (en) 1955-01-19
NL181210C (en)
GB742134A (en) 1955-12-21
CH342603A (en) 1959-11-30
CH326329A (en) 1957-12-15
DE1025011B (en) 1958-02-27

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