US2540923A - Electron-discharge tube circuit arrangement - Google Patents

Electron-discharge tube circuit arrangement Download PDF

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Publication number
US2540923A
US2540923A US762373A US76237347A US2540923A US 2540923 A US2540923 A US 2540923A US 762373 A US762373 A US 762373A US 76237347 A US76237347 A US 76237347A US 2540923 A US2540923 A US 2540923A
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circuit
diode
anode
potential
cathode
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US762373A
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English (en)
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Williams Frederic Calland
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    • 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
    • H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
    • H03K3/16—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using a transformer for feedback, e.g. blocking oscillator with saturable core

Definitions

  • FIG. 3 gaz P- H.T.+
  • This invention relates to! ⁇ electron-discharge tube circuit arrangements for use in producing waveforms showing desired characteristics and thewobject of the invention is to providel a circuit arrangement for. producing a sharp wavefront at a predetermined instant.
  • a'circuit slrrangement for generating a voltage waveform having a ⁇ sharp wavefront at a desired ⁇ instant during the run-down of an alillid negative-@i113 voltage comprising an electron discharge tube, switch means such as a diode through which said voltage may b applied tdthe control grid of the tube at the desired instant as determinedby the instantaneous Value of said voltage and a regelrerative feedback circuit closed by the switch Ireajns, ⁇ the arrangement being such that if' the negative-going voltage is applied kvt/hen the tube isconducting then at' the desired instant boththe applied waveform and the feedback" become effective ⁇ in turning the t'ube on on its control grid thereby'generating the shar'pwavefront' in an outputcircuit of the tube.
  • a circuit arrangement Iror producing a voltage "wave ⁇ form of desired timingv and' of sharp wavefront includes anV electron-'discharge'tube the control grid of which normally' takescurrentand' ⁇ a r'e!
  • the feedback circuit may be connected between'the control grid; andanotherrlelegctrode of the ⁇ tube' andthe initial potential referred to maybe that applied to an electrode of a unilaterally conducting' device such as the anode of a diode inthe feedbackcircuit, to the cathode of ⁇ which the negative-goingvoltage is applied, the anode of the diode being coupled to the control grid of the electron dischargeV tube;
  • thefeedback circuit is constituted by a ⁇ transformer coupling between the cathode of the tube and the control grid; thetransformer coupling being completed through a unilaterally conducting device such as a diode'an'd ⁇ through a coupling condenser, and the operation of the circuit is such that regeneration does not occur until the potentials applied to the unilaterally conducting device cause the feedback circuit to becomeeffective'. ⁇ I N
  • the invention may be more clear- 2. ly understood, and readily carried intoeffect, one circuit arranged to operate in accordance there: with will now be described by way ofexainple with reference to the accompanying drawing in which:
  • Fig, 1 shows such a circuit, Y,
  • Fig. 2 shows voltagewave forms associated with certain electrodes of the valves shown in Fig. 1, and
  • Figures 3 ande show m'odicaticns of the circuitA shownv in Figure 1.
  • the circuit of Figure 1 is intended t0 produce a wave form having an extremely sharp wavefrontor leading ⁇ edge whichrlis'tinied to occur at any controlled instant during the period of a sawtooth waveform.
  • ⁇ It may lbeassunoed that there is ⁇ available at the input of the circuit shown in Fig. l a sawtooth voltage waveform as shown at a in Fig. 2 and that it is desired to produce a sharp wavefront at the instant ⁇ :c in thesawtooth cycle.
  • the initial duiefscentl state of the circuit is such that the' control grid of a pentode valve Vl is taking current, the; anode current of the valvebeing at saturation level such that its voltage is at the lowest level.
  • the sawtooth voltage waveform 11 the D.AC. component of which is restored to ground level, is applied from terminal tl through the secondary winding of a pulse transformer PT to the cathode' of a diode valve DI.
  • the potential of the anodeuof this diode is adjusted to a value -V by a'tapping o n a potentiometer resistance P connected to a source of 200 volts' negative, a resistance RZbeing connectedin" the lead to the anode of the diode.
  • the diode functions as a switch means andthe sawtoothvoltage is applied to the controlwgrid of tllevalVeVl ⁇ through the diodel the condenser Cl and theV resistance R3.
  • the anode voltage of the diode now follows the curve shown at b ⁇ in Fig. 2 ⁇ and the control grid potential is thus progressively decreased.
  • 3 cathode current of the valve VI is decreased and a negative-going wavefront is developed across the primary winding of the transformer PT, the primary winding of which consists of 135 turns of number 38 S. W. G. wire wound in one layer next to a core of radiometal.
  • the secondary winding consists of 200 turns of similar wire wound on top of the primary winding and suitably insulated.
  • the electrodes'of the diode DI and valve Vi return to their initial operating values and the circuit returns to its quiescent state. If the return time of the sawtooth waveform is short, and the condenser/resistance combination CI/R3 does not transfer the whole of the waveform to the control grid, the back edge of the square waveform c may not coincide with the return to quiescence of the waveform b.
  • the anode of the valve Vl is connected through its resistance R6 to a high tension source of 330 Volts positive and the control grid is connected through resistances R3 and RI to a source of 200 volts positive.
  • the resistances and condensers shown have the following values:
  • the applied sawtooth waveform may commence at a positive voltage if desired, the anode potential of the diode DI being adjusted to a smaller positive voltage.
  • a desired modified anode waveform may be obtained by applying a modulation waveform of the suppressor grid of the pentode valve Vl.
  • a circuit arrangement for generating a voltage waveform having a sharp wave f ront at a desired instant during the run-down of an applied voltage comprising a diode to which said voltage is applied, biasing means for said diode for preventing conductionr through said diode until a predetermined time after the beginning of the run-down of said applied voltage, an electron discharge tube, means for applying a pulse to an electrode of Said electron discharge tube on the conduction of said diode to cause a change in the condition of said electron discharge tube, and regenerative feedback circuit including an amplifying device between another of the electrodes of said electron discharge tube and the inputof said diode, said feed-back circuit being completed on the conduction of said diode whereby a sharpV wave front is produced in the output circuit of said electron discharge tube.
  • said regenerative feedback circuit comprises a step-up transformer the primary winding of which is connected in circuit with said electrode while the secondary winding is connected in series with the input circuit to said diode.
  • a circuit arrangement for generating a voltage waveform having a sharp wave front at a desired instant during the run-down of a negativegoing voltage comprising a diode having Van anode, said diode having a cathode to which is applied said negative-going voltage, variable biassing means for applying a negative bias to the anode of said diode to prevent conduction of said diode until a predetermined time after the beginning of the run-down of said negative-going voltage, an electron discharge tube having an anode and a cathode as Well as a control grid, 9, power cir- I cuit for applying a direct current potential between said anode and said cathode with the latter negative, means for applying a positive bias to the control grid of said tube to cause the tube to conduct, an alternating current coupling cr-Y cuit having a short time constant between the anode of said diode and said control grid whereby on the conduction of said diode a negative-going pulse is applied to said control grid to initiate the cutting off of
  • generator means for producing a linearly varying potential
  • said generator means including an output circuit, an electron discharge device having an anode as well as a cathode with a control grid between the anode and the cathode, a source of direct current potential having its positive side connected to said anode and its negative side connected to said cathode, means connecting the negative side of said output circuit to said grid and the positive side of said output circuit to said cathode, means in said output circuit for blocking passage of current therethrough to said grid when said rstnamed potential is below a predetermined value and for permitting passage of current to said grid in said output circuit when said first-named po tential is above said predetermined value, and means connected in series with said source of direct current potential for increasing the potential of said output circuit in response to a decrease in current iiow from said source.
  • generator means for producing a linearly increasing potential
  • said generator means including an output circuit, a half wave rectier having its negative pole connected to the negative side of the output circuit, an electron discharge device having a cathode and an anode, said device also having a control grid, a feeder connection between said grid and the positive pole of said rectier, a direct current power supply, a circuit including electrical connections respectively connecting the positive side of said supply to said anode and the negative side of said supply to said cathode, a step-up transformer having a primary winding in series with the last-named circuit and a secondary winding in series with said output circuit, an electrical connection between the positive side of the output circuit and said cathode, and means for applying a potential between the positive pole of the rectier and the positive pole of the output circuit with the positive side of the last-named potential being applied to the rectier, the lastnamed potential having a value greater than the potential of the generator means at the beginning of variation of the
  • the feeder connection comprises in series, a condenser and a resistor, said condenser and resistor having such values of capacity and resistance respectively that the time constant of the circuit including them is short as compared with the time period elapsing between the beginning and the end of a single linear increase of potential of the generator means.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microwave Tubes (AREA)
  • Generation Of Surge Voltage And Current (AREA)
US762373A 1944-10-02 1947-07-21 Electron-discharge tube circuit arrangement Expired - Lifetime US2540923A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18844/44A GB583553A (en) 1944-10-02 1944-10-02 Improvements in or relating to electron-discharge tube circuit arrangements

Publications (1)

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US2540923A true US2540923A (en) 1951-02-06

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US762373A Expired - Lifetime US2540923A (en) 1944-10-02 1947-07-21 Electron-discharge tube circuit arrangement

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US (1) US2540923A (enrdf_load_stackoverflow)
BE (1) BE478970A (enrdf_load_stackoverflow)
CH (1) CH268975A (enrdf_load_stackoverflow)
FR (1) FR962829A (enrdf_load_stackoverflow)
GB (1) GB583553A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2706247A (en) * 1949-10-14 1955-04-12 Jacobs Means and method for storing information in digital computers
US2726329A (en) * 1952-03-22 1955-12-06 Itt Signal terminator circuit
US2779870A (en) * 1952-09-11 1957-01-29 Sperry Prod Inc Amplitude comparison circuit
US2791689A (en) * 1953-09-08 1957-05-07 Collins Radio Co High input impedance comparator
US2806139A (en) * 1951-07-16 1957-09-10 Bull Sa Machines Pulse reshaper
US2872596A (en) * 1955-03-31 1959-02-03 Hughes Aircraft Co Transistor voltage comparator
US2891151A (en) * 1954-06-23 1959-06-16 Du Mont Allen B Lab Inc Regenerative delay circuit
US2934707A (en) * 1953-08-28 1960-04-26 Itt Multiar circuit
US2952811A (en) * 1956-06-14 1960-09-13 Itt Modulation synchronizing pulse generator
US2975363A (en) * 1957-05-08 1961-03-14 Itt Multiar circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1075663B (de) * 1960-02-18 Siemens &. Halske Aktiengesell schaft Berlin und München Schal ungsanordnung zur Wiederherstellung der Flankensteilheit von Impulsen und zur I eistungsverstarkung von Impulsen
DE1041080B (de) * 1954-06-10 1958-10-16 Siemens Ag Frequenzstabiler Rechteckgenerator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2230926A (en) * 1939-04-13 1941-02-04 Philco Radio & Television Corp Timing signal circuits
US2258752A (en) * 1938-10-06 1941-10-14 Rca Corp Saw-tooth wave generator circuit arrangement
US2266509A (en) * 1937-03-18 1941-12-16 Emi Ltd Electric signal pulse controlling circuits
US2414486A (en) * 1943-11-30 1947-01-21 Bell Telephone Labor Inc Sweep control circuits
US2426710A (en) * 1945-01-27 1947-09-02 Farnsworth Television & Radio Composite television signal generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2266509A (en) * 1937-03-18 1941-12-16 Emi Ltd Electric signal pulse controlling circuits
US2258752A (en) * 1938-10-06 1941-10-14 Rca Corp Saw-tooth wave generator circuit arrangement
US2230926A (en) * 1939-04-13 1941-02-04 Philco Radio & Television Corp Timing signal circuits
US2414486A (en) * 1943-11-30 1947-01-21 Bell Telephone Labor Inc Sweep control circuits
US2426710A (en) * 1945-01-27 1947-09-02 Farnsworth Television & Radio Composite television signal generator

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2706247A (en) * 1949-10-14 1955-04-12 Jacobs Means and method for storing information in digital computers
US2806139A (en) * 1951-07-16 1957-09-10 Bull Sa Machines Pulse reshaper
US2726329A (en) * 1952-03-22 1955-12-06 Itt Signal terminator circuit
US2779870A (en) * 1952-09-11 1957-01-29 Sperry Prod Inc Amplitude comparison circuit
US2934707A (en) * 1953-08-28 1960-04-26 Itt Multiar circuit
US2791689A (en) * 1953-09-08 1957-05-07 Collins Radio Co High input impedance comparator
US2891151A (en) * 1954-06-23 1959-06-16 Du Mont Allen B Lab Inc Regenerative delay circuit
US2872596A (en) * 1955-03-31 1959-02-03 Hughes Aircraft Co Transistor voltage comparator
US2952811A (en) * 1956-06-14 1960-09-13 Itt Modulation synchronizing pulse generator
US2975363A (en) * 1957-05-08 1961-03-14 Itt Multiar circuit

Also Published As

Publication number Publication date
FR962829A (enrdf_load_stackoverflow) 1950-06-21
GB583553A (en) 1946-12-20
CH268975A (de) 1950-06-15
BE478970A (enrdf_load_stackoverflow)

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