GB287532A - Improvements in or relating to thermionic amplifiers, frequency changers and the like - Google Patents

Improvements in or relating to thermionic amplifiers, frequency changers and the like

Info

Publication number
GB287532A
GB287532A GB8778/28A GB877828A GB287532A GB 287532 A GB287532 A GB 287532A GB 8778/28 A GB8778/28 A GB 8778/28A GB 877828 A GB877828 A GB 877828A GB 287532 A GB287532 A GB 287532A
Authority
GB
United Kingdom
Prior art keywords
amplifiers
tuned
neutralizing
frequency
circuit
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
GB8778/28A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB287532A publication Critical patent/GB287532A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H03F1/14—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means
    • H03F1/16—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means in discharge-tube amplifiers
    • 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
    • H03B19/10—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 multiplication only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

287,532. Marconi's Wireless Telegraph Co., Ltd., (Assignees of Hansell, C. W.). March 23, 1927, [Convention date]. Thermionic amplifiers.- In a thermionic frequencychanging amplifier the output circuit is tuned to an harmonic of the input fre. quency, and one or more condensers are provided either for neutralizing interelectrode capacity or for over-neutralizing and so introducing regeneration. As shown in Fig. 6, the input is applied to the grids of two amplifiers T1, T2 arranged in phase opposition, the plates being so connected to the circuit Cp, Lp that the output currents are combined additively. In this arrangement even harmonics are combined in phase whilst odd harmonics are eliminated by phase opposition. By connecting the plates to the circuit Cp, Lp so that the high-tension supply flows through the two halves of the coil Lp in parallel, odd harmonics are preserved and even harmonics disappear. The input coil Lg is tuned by the series condensers Cg<1>, Cg<2> whilst the output circuit is tuned to a selected harmonic by means of the condenser Cp. Regeneration can be introduced by adjusting the neutralizing condenser CN beyond the point of balance. A series of such amplifiers may be arranged in cascade in order to secure a progressive change in frequency from stage to stage. This permits a low-frequency piezo crystal of convenient dimensions to be inserted in one of the earlier stages for the purpose of maintaining the final output frequency at a constant value.
GB8778/28A 1927-03-23 1928-03-22 Improvements in or relating to thermionic amplifiers, frequency changers and the like Expired GB287532A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US177505A US1878308A (en) 1927-03-23 1927-03-23 Frequency multiplier and amplifier

Publications (1)

Publication Number Publication Date
GB287532A true GB287532A (en) 1928-07-19

Family

ID=22648869

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8778/28A Expired GB287532A (en) 1927-03-23 1928-03-22 Improvements in or relating to thermionic amplifiers, frequency changers and the like

Country Status (3)

Country Link
US (1) US1878308A (en)
GB (1) GB287532A (en)
NL (1) NL23522C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675476A (en) * 1945-06-23 1954-04-13 Reuben A Isberg Oscillator
US2520823A (en) * 1946-04-10 1950-08-29 Premier Crystal Lab Inc Oscillator frequency control
US2913670A (en) * 1957-12-30 1959-11-17 Edwin F Laine Wide band regenerative frequency divider and multiplier
US3496470A (en) * 1966-07-11 1970-02-17 Motorola Inc Frequency modulation transmitter with crystal filter interposed between class c frequency multipliers for noise reduction
CN104507500A (en) 2012-05-10 2015-04-08 麻省理工学院 Agents for influenza neutralization
US9969794B2 (en) 2012-05-10 2018-05-15 Visterra, Inc. HA binding agents

Also Published As

Publication number Publication date
US1878308A (en) 1932-09-20
NL23522C (en)

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