GB646475A - Improvements in or relating to circuit arrangements in which high-frequency oscillations are generated or amplified - Google Patents

Improvements in or relating to circuit arrangements in which high-frequency oscillations are generated or amplified

Info

Publication number
GB646475A
GB646475A GB4242/48A GB424248A GB646475A GB 646475 A GB646475 A GB 646475A GB 4242/48 A GB4242/48 A GB 4242/48A GB 424248 A GB424248 A GB 424248A GB 646475 A GB646475 A GB 646475A
Authority
GB
United Kingdom
Prior art keywords
frequency
inductance
condenser
circuit
amplified
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
GB4242/48A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB646475A publication Critical patent/GB646475A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/24—Continuous tuning of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning
    • 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
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection

Landscapes

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

Abstract

646,475. Valve circuits. PHILIPS ELECTRICAL, Ltd. Feb. 13, 1948, No. 4242. Convention date, Feb. 17, 1947. [Class 40 (v)] In a high-frequency oscillator or amplifier in which the frequency is determined by a tuned circuit comprising a variable condenser 6 and an inductance 7 variable in steps to give two or more ranges, and in which the law of variation of frequency with variation of the capacity is modified in the higher frequency ranges by the stray inductance of the leads and of the coupling-coil 11 in conjunction with the valve capacities, a similar law is obtained in the lower frequency ranges by means of an auxiliary circuit comprising a condenser 14 and inductance 13 coupled to and having a natural frequency higher than the frequencydetermining circuit. The auxiliary circuit may alternatively comprise part of the inductance 7 shunted by a condenser, Fig. 4 (not shown).
GB4242/48A 1947-02-17 1948-02-13 Improvements in or relating to circuit arrangements in which high-frequency oscillations are generated or amplified Expired GB646475A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL130436A NL75980C (en) 1947-02-17 1947-02-17

Publications (1)

Publication Number Publication Date
GB646475A true GB646475A (en) 1950-11-22

Family

ID=19791938

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4242/48A Expired GB646475A (en) 1947-02-17 1948-02-13 Improvements in or relating to circuit arrangements in which high-frequency oscillations are generated or amplified

Country Status (4)

Country Link
DE (1) DE806554C (en)
FR (1) FR961171A (en)
GB (1) GB646475A (en)
NL (1) NL75980C (en)

Also Published As

Publication number Publication date
DE806554C (en) 1951-06-14
NL75980C (en) 1953-12-15
FR961171A (en) 1950-05-06

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