US2237668A - Oscillator circuits - Google Patents

Oscillator circuits Download PDF

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Publication number
US2237668A
US2237668A US247166A US24716638A US2237668A US 2237668 A US2237668 A US 2237668A US 247166 A US247166 A US 247166A US 24716638 A US24716638 A US 24716638A US 2237668 A US2237668 A US 2237668A
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United States
Prior art keywords
tube
grid
electrode
frequency
impulse
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Expired - Lifetime
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US247166A
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English (en)
Inventor
Hermann Dietrich
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Telefunken AG
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Telefunken AG
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Publication date
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Publication of US2237668A publication Critical patent/US2237668A/en
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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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/00006—Changing the frequency

Definitions

  • OSCILLATOR CIRCUIT S Filed Dec. 22, 1958 GRID POTENTIAL 1 19.811 0 FigJib BLOCKING POTE N T/AL BLOCK/N6 POTENTIAL ⁇ l g -fi k0 0 ii L 4 v s 3 Q E Q E 8 g Q O
  • Circuit organizations may be employed for frequency division in which blocking oscillators or multivibrators are synchronized by impulses in such a way that an oscillatory process is produced by each nth rather than by each and every impulse; in other words, that the frequency of the blocking oscillator or multivibrator under consideration is a subharmonic and is the nth part of the frequency of the synchronizing impulse sequence.
  • a circuit arrangement which consists of a combination of two or more such blocking oscillators or multivibrators and which represents a coincidence arrangement designed to furnish a signal only when i may be used in the modification shown in Figure 1.
  • circuit organization 1 shall be explained by reference to Figure 1.
  • the two pentodes B and 9, each by itself, are included in the organization of a blocking oscillator; but the screen grids play here the part usually played by the plate.
  • the grids are. connected crosswise in the following fashion: Control grid of tube 8 with the suppressor grid of tube 9; suppressor grid of tube 8 with the control grid of tube 9.
  • the oscillatory circuit is preferably connected with the (suppressor or control) grid whose drive range is the greatest. As a general rule, care must be taken so that the two control grids-of a tube possess approximately the same drive range. However, it will also be sufficient if the two inter-connected grids which do not form part of the same tube,
  • the coincidence frequency will be equal to unity; if the frequencies are fractional numerals with dissimilar denominators (say, /5 or /7) then the coincidence frequency will be their maximum common multiple (that is, in this instance A
  • the frequencies are fractional numerals with dissimilar denominators (say, /5 or /7) then the coincidence frequency will be their maximum common multiple (that is, in this instance A
  • all integer division ratios are imaginable. However, for safetys sake of the arrangement it will be advisable in practice to not go beyond a division around the factor Ill.
  • a coincidence arrangement of the kind described by reference to Figure 1 permits the extension of the division ratio to a further degree. While it is true that what has been set forth applies equally to the individual blocking oscillators, it will be noticed that in a coincidence clrcuit organization the two ratios are multiplied with each other.
  • both blocking oscillators are synchronized by One and the same frequency.
  • Tube 8 because of the dimensions chosen for the resistance-capacity combination in the grid circuit, responds to each eighth, and tube 9 to each ninth, impulse; then across resistance H] the original or primary frequency has been reduced to one seventy-second.
  • the circuit organization shown in Figure 1 may be further simplified by using a special type of tube in lieu of the two separate tubes 8 and 9.
  • the electrode assembly of such unitary tube basically, should be chosen in a way as shown in Figure 5.
  • This tube besides a filament and a plate, has two distinct grid systems; each of the latter consists of at least three grids, say, control, screen and suppressor grid or else a second control grid. It would also be conceivable to use more than three grids; but two thereof should roughly possess the same drive range.
  • two electrodes serving as control grids could be inter-connected crosswise, though this is not essential. It is to be noted that what has been set forth above in connection with blocking oscillators applies, so far as the invention is concerned, equally also to multivibrators.
  • a system for producing frequency division comprising a pair of discharge tubes each having a cathode, a control electrode, a screen grid electrode, a suppressor electrode and an anode, means for connecting the control electrode of each tube to the suppressor electrode of the other tube, means including a pair of resistances each for connecting a control electrode to the associated cathode of each tube, two pairs of mutually coupled inductances, means including a condenser for connecting one inductance of each pair in parallel with each of said resistances, means for connecting the other inductance of each pair between a source of positive potential and the screen grid electrode of each tube so that neither tube passes current from anode to cathode unless both are permitted to so pass current, and an anode circuit including a single impedance for maintaining both anodes positive with respect to the cathodes, whereby the frequency of the current present in the anode circuit will be a sub-multiple of the frequency applied individually to the control electrodes of each of the tubes.
  • a system for producing frequency division comprising a pair of independently operating blocking oscillators, each oscillator comprising a discharge tube having a cathode, a control electrode, a screen grid electrode, a suppressor electrode and an anode, and each oscillator including means whereby the control electrode and the screen grid electrode of each tube are inductively coupled to each other, means for connecting the control electrode of each tube to the suppressor electrode of the other tube so that neither tube conducts anodic current unless both tubes are in the same condition, and a common anode circuit including a single load impedance for maintaining the anodes positive with respect to the cathodes whereby the time period for each cycle of the frequency appearing in the anode circuit will be the reciprocal of the difference between the frequencies of operation of the two blocking oscillators.
  • a system for producing frequency division comprising a pair of discharge tubes each having a cathode, a control electrode, a screen grid electrode, a suppressor electrode, and an anode,
  • means for connecting the control electrode of each tube to the suppressor electrode of the other tube whereby neither tube will conduct current from anode to cathode unless both are in the same condition means including a pair of resistances each for connecting a control electrode to its associated cathode, further means including a series arrangement of a condenser and an inductance connected in parallel with each resistance, a second pair of inductances each connected between a source of potential and the screen grid electrode of each tube, each of said second pair of inductances being individually positioned in mutual inductance relationship with respect to the inductance in the grid circuit of each tube respectively, whereby each tube may operate independently as a blocking oscillator, and a common anode circuit including a single impedance for maintaining each anode positive with respect to the cathodes whereby the frequency appearing in the anode circuit of the tubes will be the sub-harmonic beat frequency of the frequencies at which the tubes independently operate.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Particle Accelerators (AREA)
  • Electron Tubes For Measurement (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US247166A 1937-12-24 1938-12-22 Oscillator circuits Expired - Lifetime US2237668A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET49715D DE711591C (de) 1937-12-24 1937-12-24 Schaltungsanordnung zur Frequenzteilung mit Elektronenroehren, die als Sperrschwinger geschaltet sind oder zu Multivibratoren gehoeren

Publications (1)

Publication Number Publication Date
US2237668A true US2237668A (en) 1941-04-08

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ID=6546355

Family Applications (1)

Application Number Title Priority Date Filing Date
US247166A Expired - Lifetime US2237668A (en) 1937-12-24 1938-12-22 Oscillator circuits

Country Status (4)

Country Link
US (1) US2237668A (fr)
DE (1) DE711591C (fr)
FR (1) FR847895A (fr)
GB (1) GB505352A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485395A (en) * 1945-04-11 1949-10-18 Gen Electric Pulse generating circuit
US2516533A (en) * 1945-04-07 1950-07-25 Frederick F Slack Electrical circuit
US2611041A (en) * 1947-10-03 1952-09-16 Cooper William Henry Bernard Communication system line fault locating
US2695959A (en) * 1948-09-09 1954-11-30 Bell Telephone Labor Inc Frequency dividing circuit
US2708241A (en) * 1946-01-30 1955-05-10 Bess Leon Wide gate generator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE758534C (de) * 1939-06-03 1954-11-22 Opta Radio A G Anordnung zur Frequenzteilung einer Impulsspannung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516533A (en) * 1945-04-07 1950-07-25 Frederick F Slack Electrical circuit
US2485395A (en) * 1945-04-11 1949-10-18 Gen Electric Pulse generating circuit
US2708241A (en) * 1946-01-30 1955-05-10 Bess Leon Wide gate generator
US2611041A (en) * 1947-10-03 1952-09-16 Cooper William Henry Bernard Communication system line fault locating
US2695959A (en) * 1948-09-09 1954-11-30 Bell Telephone Labor Inc Frequency dividing circuit

Also Published As

Publication number Publication date
FR847895A (fr) 1939-10-18
GB505352A (en) 1939-05-09
DE711591C (de) 1941-10-03

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