US2227008A - Frequency reduction device - Google Patents

Frequency reduction device Download PDF

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Publication number
US2227008A
US2227008A US92153A US9215336A US2227008A US 2227008 A US2227008 A US 2227008A US 92153 A US92153 A US 92153A US 9215336 A US9215336 A US 9215336A US 2227008 A US2227008 A US 2227008A
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US
United States
Prior art keywords
frequency
grid
potential
tube
anode
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
US92153A
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English (en)
Inventor
Schlesinger Kurt
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.)
LOEWE RADIO Inc
Original Assignee
LOEWE RADIO Inc
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 LOEWE RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2227008A publication Critical patent/US2227008A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
    • H03B19/06—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes
    • H03B19/08—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device
    • H03B19/12—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device using division only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals

Definitions

  • Frequency dividers using electron tubes are well known. This invention relates to frequency dividers of this kind, and its object is a frequency reduction devise of highest reliability.
  • Another object of this invention is to synchronize the lower frequency ft. by the higher control frequency fst without retroaction.
  • Another object of this invention consists in obtaining the lower frequency in the form of short synchronizing impulses.
  • Fig. 1 is a schematic diagram of a connection according to this invention.
  • Fig. 2 are curves illustrating the functions of the device of Fig. 1.
  • the principle of this invention consists in controlling the frequency fa of an ordinary oscillation generator by means of an additional grid connected to the higher frequency source. Consequently a tube having two or more grids is used.
  • Admirably suited for this purpose are normal pentodes having a screen grid and a suppressor grid which are provided with external terminals.
  • the pentode contains a cathode I, a control grid 2, a screen grid 3 with positive bias, a suppressor grid 4 and an anode 5.
  • the screen grid 3 is connected as usual with approximately half the anode battery potential, which is adjusted by means of a potential distributor 6, 1 and is earthed by means of a condenser 8.
  • the bias of grid 4 is adjusted by means of battery I3 in series with resistance l2 and 2
  • the reaction coupling between the grid coil 9 and. the oscillatory circuit lO/Il takes place by any of the usual methods, for example inductively. Oscillations of the frequency is. in the anode circuit Ill/ll are generated so long as the distributor grid 4 permits the passage of current to the anode.
  • the control potential IS there is applied to the distributor grid 4 by way of a condenser 14 the control potential IS, the frequency of which fst is assumed to be an integral multiple of the frequency fa.
  • Fig. 2 there is shown the form of the anode current. If the suppressor grid 4 were permanently connected for transmission, for example permanently connnected with the cathode, there would result in the tube an oscillation of the frequency fa.
  • the form of the grid alternating potential of the grid2 controlling this oscillationin the tube is represented in Fig. 2 by the curve I6.
  • the potential prevailing at the suppressor grid 4 has a harmonic frequency of IE, for example double frequency.
  • the anode current which occurs may be derived as follows:
  • the suppressor grid In the first half-cycle of ll, which is designated a, the suppressor grid is supplied with a potential permitting current to flow through the tube. There accordingly occurs in this phase an anode current which is designated l8.
  • anode current In the second half-cycle of the suppressor grid potential H, which is designated b, anode current is no longer able to flow, as in this half-cycle the suppressor grid potential is negative. The anode current, therefore, in this range is zero.
  • the anode current In the third and fourth half-cycles of the control regions designated by c and (2, however, the anode current is in any case zero, because in this range the control grid 2 is negative. Consequently, for each two full cycles of the control frequency fst there is produced merely one single current impulse at the anode I8.
  • the frequency of the useful oscillation fa thus generated is accordingly distinctly determined by the control frequency fa. It depends on the tuning of the circuit [0/ H merely insofar as with a detuning of fa taken too far in relation to 1/71., fst is concerned.
  • the curvature of the potential furnished by the generator is a nearly pure sinusoidal one when taken by coupling tothe coil H].
  • a coupling of this nature may be realized by the introduction of an ohmic coupling resistance I9 in the anode circuit.
  • the resistance I9 should be small compared with the inner resistance of the tube. In the case of pentodes I9 may readily be made to be 10,000-30,000 ohms or more.
  • the duration time T of the impulses may be varied by varying the bias l3 of the suppressor grid 4, generator I remaining at constant potential, or vice versa by varying the amplitude of IE only.
  • the generator [5 limiting methods known per se (grid current limitation and anode current limitation of the terminal tube) may be provided which represent efiective means against interfering ripple, hum modulation, etc.
  • the duration of the transmission phase of 4 becomes shorter and shorter, and the impulse duration time T is accordingly reduced.
  • the greatest duration which time T is capable of attaining is the full half-cycle of the control frequency fst.
  • a circuit for producing unidirectional impulses at a predetermined rate and of a predetermined duration comprising, an electron discharge tube having a cathode, a first control electrode, a second control electrode and an output electrode, means including an inductance for normally maintaining said first controlelectrode negative with respect to said cathode, a tuned circuit comprising a parallel connected condenser and inductance, means for connecting one terminal of the tuned circuit to the output electrode of said tube, means including a load resistance for maintaining the other terminal of the tuned circuit positive with respect to the cathode, said firstnamed inductance and the inductance of said tuned circuit being mutually coupled, an output circuit coupled across'the cathode and the junction of the loadresistance and the tuned circuit, means including a resistance for normally maintaining said second control electrode negative with respect to the cathode, said negative potentials being of such magnitude as to substantially block the tube, means for applying voltage variations of a fixed frequency between the second control electrode and the cathode, the resonant frequency of the
  • said applied voltage variations and the voltage produced by said mutual coupling having such amplitude that said tube is unblocked only when said applied voltage and said produced voltage are each positive, whereby unidirectional impulses of a rate substantially coinciding with the frequency of the tuned circuit and having a duration corresponding to approximately one-fourth the time occupied by one cycle at said frequency are present in said output circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
US92153A 1935-07-27 1936-07-23 Frequency reduction device Expired - Lifetime US2227008A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE211745X 1935-07-27
DE2227019X 1936-07-08

Publications (1)

Publication Number Publication Date
US2227008A true US2227008A (en) 1940-12-31

Family

ID=32070566

Family Applications (2)

Application Number Title Priority Date Filing Date
US92153A Expired - Lifetime US2227008A (en) 1935-07-27 1936-07-23 Frequency reduction device
US152001A Expired - Lifetime US2227019A (en) 1935-07-27 1937-07-06 Multistage frequency reducer

Family Applications After (1)

Application Number Title Priority Date Filing Date
US152001A Expired - Lifetime US2227019A (en) 1935-07-27 1937-07-06 Multistage frequency reducer

Country Status (5)

Country Link
US (2) US2227008A (enrdf_load_stackoverflow)
CH (1) CH211745A (enrdf_load_stackoverflow)
FR (2) FR810057A (enrdf_load_stackoverflow)
GB (2) GB475595A (enrdf_load_stackoverflow)
NL (1) NL46094C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440653A (en) * 1944-11-14 1948-04-27 Rca Corp Locked-in oscillator circuits
US2570836A (en) * 1947-10-18 1951-10-09 Du Mont Allen B Lab Inc Coincidence blocking tube oscillator
US2864003A (en) * 1955-09-19 1958-12-09 Sylvania Electric Prod Gating frequency divider

Families Citing this family (3)

* 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
CH254954A (de) * 1945-10-04 1948-05-31 Patelhold Patentverwertung Einrichtung zum Empfang einer phasengetasteten Schwingung.
US3143712A (en) * 1959-06-04 1964-08-04 Richard H Peterson Electronic musical instrument including cascaded transistor oscillators

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440653A (en) * 1944-11-14 1948-04-27 Rca Corp Locked-in oscillator circuits
US2570836A (en) * 1947-10-18 1951-10-09 Du Mont Allen B Lab Inc Coincidence blocking tube oscillator
US2864003A (en) * 1955-09-19 1958-12-09 Sylvania Electric Prod Gating frequency divider

Also Published As

Publication number Publication date
FR810057A (fr) 1937-03-15
GB498413A (en) 1939-01-09
GB475595A (en) 1937-11-23
US2227019A (en) 1940-12-31
CH211745A (de) 1940-10-15
FR48596E (fr) 1938-04-05
NL46094C (enrdf_load_stackoverflow) 1939-07-15

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