US2621237A - Electron discharge tube circuits for generating electrical oscillations of saw-tooth wave form - Google Patents

Electron discharge tube circuits for generating electrical oscillations of saw-tooth wave form Download PDF

Info

Publication number
US2621237A
US2621237A US181136A US18113650A US2621237A US 2621237 A US2621237 A US 2621237A US 181136 A US181136 A US 181136A US 18113650 A US18113650 A US 18113650A US 2621237 A US2621237 A US 2621237A
Authority
US
United States
Prior art keywords
tube
voltage
load
control
resistance
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
US181136A
Other languages
English (en)
Inventor
Huntley Keith Gordon
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI 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
Priority claimed from GB3049248A external-priority patent/GB655790A/en
Application filed by EMI Ltd filed Critical EMI Ltd
Application granted granted Critical
Publication of US2621237A publication Critical patent/US2621237A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H03K4/90—Linearisation of ramp; Synchronisation of pulses
    • 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
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H03K4/28—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device
    • H03K4/32—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses

Definitions

  • This invention relates to electron discharge tube circuits for generating oscillations of sawtooth waveform. Such circuits are used for example in television for the purpose of reflecting the beam of a cathode ray tube.
  • a type of circuit which employs two tubes in this manner is one which operates on the resonant return principle in which a sawtooth current is set up in inductive scanning coils associated with a cathode ray tube and in which the short flank of the sawtooth oscillations is obtained by allowing the current in the coils to execute a free half-cycle of oscillation at the end of the long flank of the sawtooth oscillation.
  • one of the aforesaid tubes is employed to prevent further free oscillation by becoming conducting, this tube during its conducting period generating the initial portion of the long flank of the sawtooth oscillation after which the other tube becomes conducting for generating the remaining portion of the long flank.
  • the tube which prevents further oscillation is usually called the damper tube and the other tube is usually called the driver tube since this latter tube has applied thereto suitable controlling voltages which serve to render the valve conducting in an appropriate manner for the generation of the sawtooth oscillations.
  • the driver tube may be non-conducting for as much as the first 50 per cent of the long flank of the generated oscillation. It is of course well recognised that it is desirable for the long flank of the generated oscillations to be linear throughout its whole stroke but it is found with the circuits described above that the initial portion of the long flank is somewhat curved.
  • the drawing illustrates a circuit according to the invention which operates on the resonant return principle and mainly diifers from the circuits shown in Figures 1 and 2 of the drawings "of said co-pending' application in that the negagenerating controlling voltages which in this case,
  • the reference numeral l3 illustrates the driver tube and the reference numeral It the damper tube.
  • the driver tube I3 is a tetrode and its anode is connected to the positive terminal of a source of anode current indicated at l5 through a resistance l5, which serves to suppress parasitic oscil lations, the primary Winding I! of a transformer and a decoupling resistance i8 which is decoupled to earth by a condenser I9.
  • the secondary winding 20 of the transformer feeds current to the scanning coils 2! through a resistance 22, the resistance of the scanning coils being indicated by the resistance 23.
  • the damper tube I4 is shunted across the scanning coils 2!, and is shown as a triode.
  • Control voltages are applied to the control electrodes of the tubes I3 and I4, said control voltages being derived from a double triode tube 25!.
  • the tubes l3 and M have their cathodes connected to earth'through resistances 25 and 26 respectively which serve to make the characteristics of said tubes more linear.
  • the common cathode of tube 25 is connected through a resistance 21 to a source of negative potential, the resistance 21 serving to cause the tube 2a to function as a push-pull cathode coupled amplifier. Assuming that the scanning coils 2 l were ideal and that the tubes l3 and It were also ideal i. e.
  • the voltage across said coils in order to set up a truly linear sawtooth current in the coils, would be a constant voltage so that the control voltages derived from the tube 24 and which are fed. to the control electrodes of the tubes l3 and It would, in this case, be constant and no negative feedback voltage would be required.
  • the control voltages derived from the tube 24 and which are fed. to the control electrodes of the tubes l3 and It would, in this case, be constant and no negative feedback voltage would be required.
  • the scanning coils do not represent an ideal inductance and the tubes possess internal impedance and, accordingly, the control voltages applied to the tubes 13 and M are modified by a negative feedback voltage,.such negative feedback voltage being substantially proportional to the voltage set up across said scanning coils.
  • the negative feedback voltage is derived, as shown, from the upper end of the scanning coils 2
  • the other control electrode'of the tube 24 is connected to earth through a resistance 3!
  • the junction between the. condenserztaand resistance 29 is connected to a resistance 3
  • the condenser 28 andresistance 31 form a time constant circuit in the-feedback path feeding the voltage derived from the upper end of the scanning coils 2
  • The: tube .24 functions zasapushrpullamplifier and the control yoltages which zarezzsetzup. :in-Lthe anode circuits of .the
  • l anodeAE is connected to.
  • the control electrode of theatube: l4 through a resistance I353 shunted by a bypass condenser 59,- the resistance li being connected, to the junction of 1 a.
  • the resistancesllfi and 52 serving to apply an appropriatev biassing potential to the tube M.
  • the potentialfor thescreening electrode of thetube l3 is .derived from the positive potential source I5 through a resistance 53, the screening electrode .beingdecoupledto thecathodeof the tube l3 through condenser 56.
  • Thecircuit shown is syn- Between the 'recchronised by applying to the control electrode of the tube I3 synchronising pulses which are set up at the anode of a tube 55 which may be the output tube of a multivibrator or other source of pulses, the anode of thetube 55 deriving its anode potential from a resistance 56 connected tothe junction point of the resistances and 3E.
  • the condenser 44 serves to prevent undesired oscillations which may be otherwise set up due to phase shift in the feedback network and the rec- 'tifiertuserves'to isolate the condenser 64 from the tube when a pulse is set up at the anode 'ofsaid tubeso as to prevent delay in the builda pulse is applied to the control'electrode of the .tube i3 from the tube the tube [3 is rendered non conducting and the current in the scanning coils 2i is then permitted. toexecutea half-cycle ofxosei'llation after which the tube l4 becomes conducting to permitthe'generation of the initial portion of the-long flank of the sawtooth current across the coils 2i, this'portion'of the long.
  • the resistance. 46 is made considerably smaller .thanthe. resistance-35 so that agreater' degree vent undesired oscillations from occurring.
  • Theci-rcuitshown in Figure 1 may be modified as shown in Figure 2- by providing a resistance ii? in the anode :circuit of: the tube l4 and then connecting .the upper-end of the scanning coils 2i to'the. junction of the resistance-'57- andthe anode ofthe tubeal.
  • a circuit for generating oscillations of sawtooth waveform .in a load comprising a pair of tubes each having a control-electrode, a source of control voltage, means. for applying a control voltage'frorn said sourceto one of said tubes to control the generation of the initial portion of the long flank of .a-sawtooth oscillationymeans for applying a control voltage from said source to the other tube to control the subsequent portion of said long flank, a connection from said load to provide a negative feedback voltage substantially proportional to the Voltage set up across said load, said source of control voltage including a constant voltage, and means for obtaining the difference between said negative feedback voltage and said constant voltage to derive said control voltage modified to linearize both the initial and subsequent portions of said long flank.
  • a circuit for generating oscillations of sawtooth waveform in an inductive load comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage, means to provide a negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the difference between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage to the control electrodes of said driver and damper tubes to linearize both said portions of said long flank.
  • a circuit for generating oscillations of sawtooth waveform in a load comprising a pair of tubes each having a control electrode, a source of control voltage, means for applying a control voltage from said source to one of said tubes to control the generation of the initial portion of the long flank of a sawtooth oscillation, means for applying a control voltage from said source to the other tube to control the subsequent portion of said long flank, said source including a push-pull amplifier for generating said control voltage, a connection from said load to said amplifier to provide a negative'feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain a control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both the initial and subsequent portions of said long flank.
  • a circuit for generating oscillations of sawtooth waveform in an inductive load comprising a driver tube having a, control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both said portions of said long flank.
  • a circuit for generating oscillations of sawtooth waveform in an inductive load which includes a resistive component, comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a, free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said lonk flank, said damper tube having a control electrode, a source of control voltage, means coupling said load to said source to provide negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the diflerence between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage to the control electrodes of said driver and damper tubes to linearize both said portions of said long flank, said coupling means including a time constant network to
  • a circuit for generating oscillations of sawtooth Waveform in an inductive load which includes a resistive component, comprising a driver tube having a control electrode, means for rendering said tube conductive to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including a push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up across said load, means for applying said feedback voltage to said amplifier to obtain a control voltage dependent on the difference between said negative feedback voltage and a constant voltage, and means for applying said control voltage in push-pull to said tubes to linearize both the initial and subsequent portions of said long flank, said coupling means including a time constant network to compensate
  • a circuit for generating oscillations of sawtooth waveform in an inductive load comprising a driver tube having a control electrode, means for rendering said tube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of said current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage, means coupling said load to said source to provide negative feedback voltage substantially proportional to the voltage set up across said load, said source of control voltage including a constant voltage, means for obtaining the difference between said negative feedback voltage andusaid constant voltage toderive saidcontrol voltage, and means for applying said control voltage to the control electrodes .ofsaid driver and damper tubes to linearize both portions of said long flank, said damper tube having ananode coupled to said load through a resistance, and one end. of said
  • a circuit for generating oscillations of savvtcoth waveformin an inductive load comprising a driver tube having a control electrode, means for renderingsaidtube conducting to set up a portion of the long flank of a sawtooth oscillation in said load, means for interrupting the current in said load to produce a free half cycle of oscillation of the current for generating the short flank of said sawtooth oscillation, a damper tube connected across said load to prevent further free oscillation and to generate a further portion of said long flank, said damper tube having a control electrode, a source of control voltage including a push-pull amplifier, means coupling said load to said source to provide a negative feedback voltage substantially proportional to the voltage set up acrosssaid load, said source of control voltage including a constant voltage, means for obtaining the difierence between said negative feedback voltage and said constant voltage to derive said control voltage, and means for applying said control voltage in push-pull to said tubes'to linearize both said portions of .said long flank, said damper tube having an an

Landscapes

  • X-Ray Techniques (AREA)
  • Details Of Television Scanning (AREA)
US181136A 1948-11-24 1950-08-24 Electron discharge tube circuits for generating electrical oscillations of saw-tooth wave form Expired - Lifetime US2621237A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3049248A GB655790A (en) 1948-11-24 1948-11-24 Improvements in or relating to electron discharge tube circuits for generating electrical oscillations of sawtooth waveform
GB2621237X 1949-09-22

Publications (1)

Publication Number Publication Date
US2621237A true US2621237A (en) 1952-12-09

Family

ID=32299796

Family Applications (1)

Application Number Title Priority Date Filing Date
US181136A Expired - Lifetime US2621237A (en) 1948-11-24 1950-08-24 Electron discharge tube circuits for generating electrical oscillations of saw-tooth wave form

Country Status (4)

Country Link
US (1) US2621237A (de)
DE (1) DE863537C (de)
FR (1) FR1000244A (de)
NL (1) NL86383C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712615A (en) * 1952-01-25 1955-07-05 Gen Electric Cathode ray beam deflection circuits
US2795733A (en) * 1953-03-10 1957-06-11 Rca Corp Signal generating systems
DE1010665B (de) * 1953-07-17 1957-06-19 Emi Ltd Schaltung zur Erzeugung saegezahnfoermiger Stroeme
US2809326A (en) * 1954-03-30 1957-10-08 Howard D Gulnac Electron beam deflection circuits

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2251851A (en) * 1939-06-16 1941-08-05 Philco Radio & Television Corp Electron-beam deflecting circuit
US2284378A (en) * 1940-05-03 1942-05-26 Gen Electric Deflecting circuit
US2414546A (en) * 1942-01-06 1947-01-21 Westinghouse Electric Corp Television sweep circuits
US2440418A (en) * 1946-03-09 1948-04-27 Rca Corp Cathode-ray beam deflecting circuit
US2440786A (en) * 1943-06-30 1948-05-04 Rca Corp Cathode-ray beam deflecting circuits
US2466537A (en) * 1947-02-28 1949-04-05 Remington Rand Inc Cathode-ray tube sweep circuit
US2466784A (en) * 1945-01-13 1949-04-12 Rca Corp Cathode-ray beam deflecting circuit
US2482737A (en) * 1948-05-14 1949-09-20 Rca Corp Television receiver horizontal deflection
US2492090A (en) * 1948-11-03 1949-12-20 Avco Mfg Corp Automatic frequency control circuit for television deflecting systems
US2510027A (en) * 1947-05-28 1950-05-30 Rca Corp Cathode-ray tube deflection system
US2536839A (en) * 1949-05-24 1951-01-02 Rca Corp Power recovery cathode-ray beam deflection system
US2536857A (en) * 1949-05-24 1951-01-02 Rca Corp High-efficiency cathode-ray deflection system
US2543305A (en) * 1949-12-16 1951-02-27 Avco Mfg Corp Circuit for suppressing undesired oscillations in television receivers
US2561817A (en) * 1950-02-02 1951-07-24 Avco Mfg Corp Automatic frequency control circuit
US2574732A (en) * 1949-04-01 1951-11-13 Rca Corp Automatic control for wave forms

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB512519A (en) * 1938-03-02 1939-09-19 Baird Television Ltd Improvements in or relating to magnetic deflecting arrangements for electron discharge devices

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2251851A (en) * 1939-06-16 1941-08-05 Philco Radio & Television Corp Electron-beam deflecting circuit
US2284378A (en) * 1940-05-03 1942-05-26 Gen Electric Deflecting circuit
US2414546A (en) * 1942-01-06 1947-01-21 Westinghouse Electric Corp Television sweep circuits
US2440786A (en) * 1943-06-30 1948-05-04 Rca Corp Cathode-ray beam deflecting circuits
US2466784A (en) * 1945-01-13 1949-04-12 Rca Corp Cathode-ray beam deflecting circuit
US2440418A (en) * 1946-03-09 1948-04-27 Rca Corp Cathode-ray beam deflecting circuit
US2466537A (en) * 1947-02-28 1949-04-05 Remington Rand Inc Cathode-ray tube sweep circuit
US2510027A (en) * 1947-05-28 1950-05-30 Rca Corp Cathode-ray tube deflection system
US2482737A (en) * 1948-05-14 1949-09-20 Rca Corp Television receiver horizontal deflection
US2492090A (en) * 1948-11-03 1949-12-20 Avco Mfg Corp Automatic frequency control circuit for television deflecting systems
US2574732A (en) * 1949-04-01 1951-11-13 Rca Corp Automatic control for wave forms
US2536839A (en) * 1949-05-24 1951-01-02 Rca Corp Power recovery cathode-ray beam deflection system
US2536857A (en) * 1949-05-24 1951-01-02 Rca Corp High-efficiency cathode-ray deflection system
US2543305A (en) * 1949-12-16 1951-02-27 Avco Mfg Corp Circuit for suppressing undesired oscillations in television receivers
US2561817A (en) * 1950-02-02 1951-07-24 Avco Mfg Corp Automatic frequency control circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712615A (en) * 1952-01-25 1955-07-05 Gen Electric Cathode ray beam deflection circuits
US2795733A (en) * 1953-03-10 1957-06-11 Rca Corp Signal generating systems
DE1010665B (de) * 1953-07-17 1957-06-19 Emi Ltd Schaltung zur Erzeugung saegezahnfoermiger Stroeme
US2809326A (en) * 1954-03-30 1957-10-08 Howard D Gulnac Electron beam deflection circuits

Also Published As

Publication number Publication date
NL86383C (de)
DE863537C (de) 1953-01-19
FR1000244A (fr) 1952-02-11

Similar Documents

Publication Publication Date Title
US2266516A (en) Saw-tooth wave generator
US2579627A (en) Deflection system
US2280990A (en) Thermionic valve circuits for the generation of saw tooth currents
US2248975A (en) Electrical oscillation generator
US2212202A (en) Electronic oscillation generator
US2797316A (en) Circuit arrangement generating sawtooth current waves
US2466784A (en) Cathode-ray beam deflecting circuit
US2360697A (en) Saw-tooth wave generation
US2255403A (en) Periodic wave repeater
US2230819A (en) Thermionic valve circuits
US2832003A (en) Compensated sweep circuit
US2396439A (en) Electron tube circuits
US2572016A (en) Thermionic valve circuits
US2584882A (en) Integrating circuits
US2729766A (en) Electronic oscillator circuits
US2692334A (en) Electrical circuit arrangement for effecting integration and applications thereof
US2621237A (en) Electron discharge tube circuits for generating electrical oscillations of saw-tooth wave form
US2305919A (en) Deflection circuit
US2254087A (en) Electrical oscillation generator
GB622002A (en) Improvements in or relating to thermionic valve circuit arrangements
US2602896A (en) Saw-tooth wave generator
US2416292A (en) Saw-tooth wave generation
US2480511A (en) Scanning circuit
US2775694A (en) Electrical circuit arrangements for effecting integration and applications thereof
US2698400A (en) Generator for dynamic focusing of cathode ray tubes