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GB643915A - Improvements in or relating to electronic amplifiers having a constant or substantially constant gain - Google Patents

Improvements in or relating to electronic amplifiers having a constant or substantially constant gain

Info

Publication number
GB643915A
GB643915A GB8398/48A GB839848A GB643915A GB 643915 A GB643915 A GB 643915A GB 8398/48 A GB8398/48 A GB 8398/48A GB 839848 A GB839848 A GB 839848A GB 643915 A GB643915 A GB 643915A
Authority
GB
United Kingdom
Prior art keywords
valve
gain
march
transformer
signal output
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
GB8398/48A
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
Priority claimed from NL131233A external-priority patent/NL89155C/xx
Application filed by Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB643915A publication Critical patent/GB643915A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • 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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
    • H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
    • 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
    • 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
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
    • H03F3/40—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/66—Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Amplifiers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

643,915. Valve amplifying circuits. PHILIPS ELECTRICAL, Ltd. March 22, 1948, No. 8398. Convention date, March 25, 1947. Addition to 625,916. [Classes 40 (v) and 40 (vi)] In an amplifier which, as in the parent Specification is self-oscillating and generates an auxiliary tone used to render the gain constant, the signal output is derived from the auxiliary tone by rectification. A valve 1 is back-coupled over a transformer 5 so as to oscillate. Signals applied at terminals 2 produce grid modulation which is detected by a diode 6, an amplified signal output being obtained across the load resistance 8. Part is fed back via a tap to the valve 1 in reverse phase, together with a D.C. automatic amplitude control bias. In a further embodiment (Fig. 2, not shown), the feedback path comprises a resistance-capacity low-pass network ; this arrangement is stated to function as an integrating circuit, the gain being inversely proportional to signal frequency. Regeneration may also be applied for the signal by including in the back-coupling network a transformer resonant at the mean signal frequency.
GB8398/48A 1943-03-19 1948-03-22 Improvements in or relating to electronic amplifiers having a constant or substantially constant gain Expired GB643915A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL860818X 1943-03-19
NL131233A NL89155C (en) 1947-03-25 1947-03-25

Publications (1)

Publication Number Publication Date
GB643915A true GB643915A (en) 1950-09-27

Family

ID=37564251

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8398/48A Expired GB643915A (en) 1943-03-19 1948-03-22 Improvements in or relating to electronic amplifiers having a constant or substantially constant gain

Country Status (5)

Country Link
US (1) US2623954A (en)
DE (1) DE888265C (en)
DK (1) DK73580C (en)
FR (1) FR58107E (en)
GB (1) GB643915A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2789162A (en) * 1952-03-01 1957-04-16 Gen Electric Wave amplifying circuits
US2756287A (en) * 1952-04-11 1956-07-24 Baldwin Piano Co Audio amplifier compensated gain control
US2817716A (en) * 1954-03-05 1957-12-24 Melvin B Freedman Gain control circuits
US2919415A (en) * 1954-03-22 1959-12-29 Hoffman Electronics Corp Amplitude modulated blocking oscillators or the like
US2840648A (en) * 1956-11-15 1958-06-24 Bell Telephone Labor Inc Electric signal transmission
DE1269188B (en) * 1966-03-04 1968-05-30 Fernseh Gmbh Method and arrangement for regulating the amplification of an amplifier for electrical signals which can be controlled by means of a direct voltage

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2041951A (en) * 1933-08-17 1936-05-26 American Telephone & Telegraph Modulating system
US2175990A (en) * 1933-12-28 1939-10-10 Hirsch Nicholas Process and arrangement for increasing the maximum output of electron tubes
US2153752A (en) * 1934-08-08 1939-04-11 Telefunken Gmbh Direct current amplifier circuits
US2233453A (en) * 1937-04-17 1941-03-04 Siemens Ag Transmitter
US2201770A (en) * 1937-05-15 1940-05-21 Hazeltine Corp Frequency stabilizing arrangement
US2255190A (en) * 1939-02-18 1941-09-09 Ryall Leonard Ernest Variable amplifying device
US2346545A (en) * 1940-08-10 1944-04-11 Bell Telephone Labor Inc Electron discharge device circuit
US2432512A (en) * 1944-01-08 1947-12-16 Bell Telephone Labor Inc Automatic modulation control circuit
US2435262A (en) * 1944-01-26 1948-02-03 Bell Telephone Labor Inc Self-modulated oscillator

Also Published As

Publication number Publication date
FR58107E (en) 1953-09-21
DK73580C (en) 1952-01-02
US2623954A (en) 1952-12-30
DE888265C (en) 1953-08-31

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