US2890332A - Electronic bias switch - Google Patents

Electronic bias switch Download PDF

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Publication number
US2890332A
US2890332A US452514A US45251454A US2890332A US 2890332 A US2890332 A US 2890332A US 452514 A US452514 A US 452514A US 45251454 A US45251454 A US 45251454A US 2890332 A US2890332 A US 2890332A
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US
United States
Prior art keywords
tubes
resistors
voltage
tube
source
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 - Lifetime
Application number
US452514A
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English (en)
Inventor
Henry J Kochevar
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.)
Bendix Aviation Corp
Original Assignee
Bendix Aviation Corp
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 Bendix Aviation Corp filed Critical Bendix Aviation Corp
Priority to US452514A priority Critical patent/US2890332A/en
Priority to JP2190755A priority patent/JPS336289B1/ja
Application granted granted Critical
Publication of US2890332A publication Critical patent/US2890332A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/20—Cathode-ray oscilloscopes
    • G01R13/22—Circuits therefor
    • G01R13/28—Circuits for simultaneous or sequential presentation of more than one variable
    • 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
    • H03K17/54—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements of vacuum tubes

Definitions

  • This invention relates to a circuit for providing a bias voltagelwhich is independently variable for two sets of conditions.
  • Such circuits find application where it is desired to generate two apparently simultaneous dis plays on the screen of a cathode ray tube.
  • Such displays may be generated by alternating the location of the origin of a sweep between two values, the alternation occurring at the end of each sweep or at the end of the generation of each display.
  • the shift in the location of the sweep origin may be accomplished by shifting the bias voltage in a sweep displacement circuit between two values.
  • the invention has particular advantages for use in a situation in which the display is generated at a point remote from a control station. In that case it is not desirable to transmit power from the control station in view of losses and transient surges which are inherent in the transmission and control of large D.C. voltages over a long line.
  • bias voltage may be switched between two ranges from a remote point with a minimum of connecting conductors and without the deleterious effects of losses and transient surges.
  • the single figure of the drawing is a schematic diagram of a circuit embodying the invention.
  • a D.C. power source indicated as a battery 1, having an intermediate point grounded. Joining the negative terminal of the battery is a resistor 2.
  • a resister 3 has one terminal grounded.
  • the anodes of these tubes are connected to the said tree terminal of resistor 3 which acts as a common load resistor for them.
  • the cathodes are connected to respective sliding contacts 6 and 7 on resistors 8 and 9, each of which has a terminal 2,890,332 Patented June 9, 1959 connected to the said free terminal of resistor 2.
  • the remaining terminals of resistors 8 and 9 are joined and the junction connected by way of a resistor 10 to ground.
  • a pair of switching tubes 12 and 13 having their respective anodes connected by way of resistors 14 and 15 to the positive terminal of source 1 and their cathodes connected to the negative terminal of that source.
  • the control grid of tube 4 is connected by way of a serially connected pair of resistors 16 and 17 to the negative terminal of the source 1.
  • the control grid of tube 5 is similarly connected to the same terminal by way of serial resistors 18 and 19.
  • the anodes of tubes 12 and 13 are connected to the junctions of resistors 16 and 17 and resistors 18 and 19 respectively.
  • Switching voltages E and E which are oppositely phased square wave voltages, are applied to the control grids of tubes 12 and 13 respectively from terminals 20 and 21 respectively. These terminals are connected to ground through resistors 22 and 23 respectively.
  • One advantage of the invention is the fact that the source impedance can be varied over a wide range by selection of the resistor 3 and can be made very low if desired. In view of the low impedance of the source and the purely resistive nature of the impedance of the load of the tubes 4 and 5 there will be no significant introduction of transient variations into the bias voltage by reason of the switching action of these tubes.
  • the tubes 4, 5 may be separated by a long distance from the displacement circuit being controlled without the introduction of variations into the bias voltage through pick-up of ener gy by the linking conductors.
  • the switching time or the time required to shift from the application of one level of bias voltage to the other, is very rapid. For this reason the switching frequency may be very high.
  • tubes 4, 5, 12 and 13 are shown as triodes, pentodes could be used if desired.
  • a source of supply voltage a voltage divider in series therewith, said voltage divider having a pair of parallel resistive branches of substantially equal value connected to a negative terminal of said source, a pair of thermionic tubes, each having a cathode, an anode and a control grid, a common load resistor for said tubes connected between the anode of each of said tubes and a grounded terminal of said source, means applying biasing voltage tothe said control grids in a manner such that such tubes are alternately and oppositely biased between conductive and nonconductive states, means connecting the cathode of each of said tubes to a variable tap on a respective one of said branches, and means for deriving the output from said circuit across said load resistor, said means applying biasing voltage to said control grids comprising a pair of thermionic switch tubes, a source of supply voltage for said switch tubes, means applying oppositely phase rectangular wave voltages to the inputs of said switch tubes, thereby shifting said tubes alternately and oppositely between conductive and non-conductive

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
US452514A 1954-08-27 1954-08-27 Electronic bias switch Expired - Lifetime US2890332A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US452514A US2890332A (en) 1954-08-27 1954-08-27 Electronic bias switch
JP2190755A JPS336289B1 (en, 2012) 1954-08-27 1955-08-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US452514A US2890332A (en) 1954-08-27 1954-08-27 Electronic bias switch

Publications (1)

Publication Number Publication Date
US2890332A true US2890332A (en) 1959-06-09

Family

ID=23796752

Family Applications (1)

Application Number Title Priority Date Filing Date
US452514A Expired - Lifetime US2890332A (en) 1954-08-27 1954-08-27 Electronic bias switch

Country Status (2)

Country Link
US (1) US2890332A (en, 2012)
JP (1) JPS336289B1 (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034065A (en) * 1958-09-12 1962-05-08 Columbia Broadcasting Syst Inc Electronic switching apparatus
US20050140599A1 (en) * 2003-12-30 2005-06-30 Lee Han S. Electro-luminescence display device and driving apparatus thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399586A (en) * 1943-09-11 1946-04-30 Press Wireless Inc Balanced modulator system
US2428126A (en) * 1944-07-21 1947-09-30 Colonial Radio Corp Duplex control circuit
US2639379A (en) * 1950-10-16 1953-05-19 Bendix Aviat Corp Electronic switching and mixing circuit for pulsating direct current
US2698382A (en) * 1951-03-30 1954-12-28 Jr Kenneth M Uglow Electronic switching method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399586A (en) * 1943-09-11 1946-04-30 Press Wireless Inc Balanced modulator system
US2428126A (en) * 1944-07-21 1947-09-30 Colonial Radio Corp Duplex control circuit
US2639379A (en) * 1950-10-16 1953-05-19 Bendix Aviat Corp Electronic switching and mixing circuit for pulsating direct current
US2698382A (en) * 1951-03-30 1954-12-28 Jr Kenneth M Uglow Electronic switching method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3034065A (en) * 1958-09-12 1962-05-08 Columbia Broadcasting Syst Inc Electronic switching apparatus
US20050140599A1 (en) * 2003-12-30 2005-06-30 Lee Han S. Electro-luminescence display device and driving apparatus thereof
US8068078B2 (en) * 2003-12-30 2011-11-29 Lg Display Co., Ltd. Electro-luminescence display device and driving apparatus thereof

Also Published As

Publication number Publication date
JPS336289B1 (en, 2012) 1958-08-11

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