US2312739A - Ultra-short wave amplifier - Google Patents

Ultra-short wave amplifier Download PDF

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Publication number
US2312739A
US2312739A US340514A US34051440A US2312739A US 2312739 A US2312739 A US 2312739A US 340514 A US340514 A US 340514A US 34051440 A US34051440 A US 34051440A US 2312739 A US2312739 A US 2312739A
Authority
US
United States
Prior art keywords
damping
inductance
cathode
circuit
ultra
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
US340514A
Other languages
English (en)
Inventor
Ziel Aldert Van Der
Strutt Maximiliaan Julius Otto
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2312739A publication Critical patent/US2312739A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only
    • 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
    • H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
    • H03F1/28—Modifications of amplifiers to reduce influence of noise generated by amplifying elements in discharge-tube amplifiers

Definitions

  • damping o f the amplifyingtubes is composed of various components
  • the voltage drop 4in the screen grid conductor has an action reducing the damping, since a voltage occurs through the inductance of the screen grid conductor, which voltage lags to the extent vof about 90 withrespect to the control grid voltage,
  • a push-pull circuit of two amplifying systems each of which comprises at least a cathode, a control grid, a screen grid and an anode, the cathodes of the two systems being connected to one another by a shortest possible conductor so as to 4provide negligible impedance while each of the screen grids is connected to the associated cathodes by an inductance which is so proportioned that ⁇ the input-damping of the circuit is ⁇ zero or negative.
  • the inductances in the screen grid conductors may consequently be made smaller, according as the slope of the amplifying systemis higher, whereas when using a single tube the required inductance would increase with anr increase o i the slope.
  • the input voltage which may originate, for example, from a dipole antenna is supplied to te'rminalsv I and 2, and inductlvely transmitted to the oscillatory input circuit 3.
  • 'I'.he ends of the oscillatory circuit 3 are connected in 'push-pull relation to the control grids 3'4" of a pushpull amplifylng'tube l.'
  • This tube contains two amplifying systems, each of which is constituted by a cathode', a control grid, a screen grid, a suppressorgrid ⁇ being connected tothe cathode and an anode of each section.
  • the anodes have connected between them an oscillatory output circuit 5 from which the amplified' voltage may be derived by terminals l and 1.
  • The'required inductance value of the coils 8 and l is of the order of 10'l henry.
  • An amplifying circuit for ultra-short waves comprising a single-tube provided with two'sets of electrodes, each set including at least a single terminal cathode, a control grid, a screen grid and an anode, the cathode terminals of the two electrode sets being connected toone another inside the tube by a shortest possible conductor and connected to a single lead only extending to the exterior of the tube and the screen grids each having a separate connection to an external terminal of the tube, and a high frequency path lncluding an inductance coil between each of the external screen grid terminals and the single lead connected to the cathodes, said inductance coils being so proportioned that the input damping oi' the circuit is substantially negligible.
  • an evacuated envelope containing a pair of similar electrode systems each comprising a single terminal cathode, -a control grid, a screen grid and an anode, the cathodes being internally connected at their terminals by a path having so little inductance that very little input damping is produced thereby, said internal cathode connection being connected to a single' lead oniy.extending to the exterior of the tube and the screens being brought out separately whereby interchangeable amounts of inductance '-may be connected between screens, said latter inductance, by virtue of said small inter-cathode inductance, being effective to eliminate input damping without being so large as to resonate with the screen capacities at any frequency near the operating frequency.
  • each to the transit time of the electrons between each cathode and signal grid being comparable to the frequency of the oscillations to be amplined
  • Y means for minimizing said damping eiect on the input circuit comprising an inductance connected between eachyscreen grid terminal and the single lead connected ⁇ to the cathodes.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US340514A 1939-12-02 1940-06-14 Ultra-short wave amplifier Expired - Lifetime US2312739A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL223662X 1939-12-02
NL2312510X 1940-06-19

Publications (1)

Publication Number Publication Date
US2312739A true US2312739A (en) 1943-03-02

Family

ID=32095508

Family Applications (2)

Application Number Title Priority Date Filing Date
US340514A Expired - Lifetime US2312739A (en) 1939-12-02 1940-06-14 Ultra-short wave amplifier
US392632A Expired - Lifetime US2312510A (en) 1939-12-02 1941-05-09 Amplifying circuit for ultra-short waves

Family Applications After (1)

Application Number Title Priority Date Filing Date
US392632A Expired - Lifetime US2312510A (en) 1939-12-02 1941-05-09 Amplifying circuit for ultra-short waves

Country Status (5)

Country Link
US (2) US2312739A (xx)
BE (2) BE441801A (xx)
CH (2) CH223662A (xx)
FR (2) FR872830A (xx)
GB (1) GB629882A (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546837A (en) * 1947-08-21 1951-03-27 Rca Corp Paralleled amplifier circuits

Also Published As

Publication number Publication date
CH223662A (de) 1942-09-30
FR51643E (fr) 1943-03-18
CH232060A (de) 1944-04-30
BE441801A (xx)
BE440866A (xx)
GB629882A (en) 1949-09-29
US2312510A (en) 1943-03-02
FR872830A (fr) 1942-06-19

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