GB608882A - Improvements in and relating to frequency dividers - Google Patents

Improvements in and relating to frequency dividers

Info

Publication number
GB608882A
GB608882A GB2879/46A GB287946A GB608882A GB 608882 A GB608882 A GB 608882A GB 2879/46 A GB2879/46 A GB 2879/46A GB 287946 A GB287946 A GB 287946A GB 608882 A GB608882 A GB 608882A
Authority
GB
United Kingdom
Prior art keywords
sub
triode
wave
tuned
harmonic
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
Application number
GB2879/46A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB608882A publication Critical patent/GB608882A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K25/00—Pulse counters with step-by-step integration and static storage; Analogous frequency dividers
    • 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
    • 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
    • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
    • H03K3/543—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a vacuum tube

Landscapes

  • Particle Accelerators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

608,882. Valve circuits for frequency dividing. BRITISH THOMSON-HOUSTON CO., Ltd. Jan. 29, 1946, No. 2879. Convention date, Oct. 9, 1942. [Class 40 (vi)] A frequency divider for producing a subharmonic wave from a fundamental sine wave or a wave of positive pulses comprises a circuit tuned to the sub-harmonic frequency and excited by the fundamental wave through a first valve during alternate half-cycles of the sub-harmonic wave, excitation during the other half-cycles being prevented by a second valve connected to the tuned circuit. Fig. 1 shows a double triode valve in which the voltage produced across the common cathode resistor due to the steady anode current in the second triode biasses the first triode beyond cut-off. In the steady state, circuit 9 which is tuned to the sub-harmonic frequency is oscillating and the resulting voltage is applied to the grid 23 of the second triode. The sub-harmonic current thus caused to flow through the common cathode resistor produces a voltage which reduces the bias on the grid of the first triode towards its cut-off value every alternate halfcycle. Thus, the fundamental signal, which may be of pulse or sine wave form, is applied to this grid and causes pulses of current to flow into the tuned current 9 during alternate halfcycles of the sub-harmonic frequency to maintain it in oscillation. Circuit component values are given for a 2.1 divider, but division by 10 is stated to be possible.
GB2879/46A 1942-10-09 1946-01-29 Improvements in and relating to frequency dividers Expired GB608882A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US461381A US2413956A (en) 1942-10-09 1942-10-09 Frequency divider

Publications (1)

Publication Number Publication Date
GB608882A true GB608882A (en) 1948-09-22

Family

ID=23832328

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2879/46A Expired GB608882A (en) 1942-10-09 1946-01-29 Improvements in and relating to frequency dividers

Country Status (3)

Country Link
US (1) US2413956A (en)
FR (1) FR952220A (en)
GB (1) GB608882A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495780A (en) * 1943-04-02 1950-01-31 Sperry Corp Damped shock excited variable width pulse gate generator
BE469835A (en) * 1944-09-15
US2445161A (en) * 1945-12-28 1948-07-13 Collins Radio Co Frequency subdividing system
US2570805A (en) * 1946-07-20 1951-10-09 Hazeltine Research Inc Signal-translating system
US2710921A (en) * 1951-10-19 1955-06-14 Bell Telephone Labor Inc Frequency divider apparatus
US2877350A (en) * 1957-05-15 1959-03-10 Wagoner Robert George Locked phase frequency divider
US3478225A (en) * 1965-10-24 1969-11-11 Motorola Inc Frequency dividing system including transistor oscillator energized by pulses derived from wave to be divided

Also Published As

Publication number Publication date
US2413956A (en) 1947-01-07
FR952220A (en) 1949-11-14

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