US2092881A - Electron discharge device - Google Patents

Electron discharge device Download PDF

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Publication number
US2092881A
US2092881A US678040A US67804033A US2092881A US 2092881 A US2092881 A US 2092881A US 678040 A US678040 A US 678040A US 67804033 A US67804033 A US 67804033A US 2092881 A US2092881 A US 2092881A
Authority
US
United States
Prior art keywords
anode
cathode
diode
circuit
discharge device
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
US678040A
Other languages
English (en)
Inventor
Jonker Johan Lodewijk Hendrik
Albricht Wilhelm
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
Priority to BE380459D priority Critical patent/BE380459A/xx
Priority to NL34771D priority patent/NL34771C/xx
Priority to DEN32221D priority patent/DE563558C/de
Priority to GB17374/31A priority patent/GB369480A/en
Priority claimed from US545946A external-priority patent/US1957542A/en
Application filed by RCA Corp filed Critical RCA Corp
Priority to US678040A priority patent/US2092881A/en
Application granted granted Critical
Publication of US2092881A publication Critical patent/US2092881A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0138—Electrical filters or coupling circuits
    • H03H7/0146—Coupling circuits between two tubes, not otherwise provided for
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only

Definitions

  • the direct current is commonly supplied to the anode through a choke coil opposing a very high impedance to all the frequencies to be amplified.
  • an alternating current circuit which is blocked for direct current by means of a condenser.
  • the impedance of the choke coil for all the frequencies to be amplified must practically be infinitely high. This condition can hardly be fulfilled and it has therefore been proposed to connect a saturated diode instead of the choke coil. Beside a comparatively low directcurrent resistance such a diode has a very high alternating current resistance which moreover is independent of the frequency. On superficial consideration the saturated diode seems to be therefore a coupling element having very favorable properties. In practice it appears however that the use of a diode does not lead to the desired result and that it is impossible to amplify a broad range of frequencies.
  • the invention is based on the View that the unsatisfactory working of this circuit-arrangement is due to the fact that with the use of a saturated diode the filament is connected to abattery or other source of current, owing to which the filament obtains a comparatively large capacity with respect to earth. Since on the other hand the filament of the amplifier valve has also an appreciable capacity relatively to earth, the
  • the diode acting as a coupling element is shunted by a rather large capacity.
  • the coupling element consequently has not a very high alternating current resistance for comparatively high fre quencies.
  • a diode comprising an indirectly heated cathode the capacity of the latter relatively to earth can be kept very small and need in general not be larger than the capacity between the grid and the cathode of the valve with which the first valve is coupled.
  • the heating element may be arranged in such a manner that the electrostatic capacity between the cathode and the heating element is very small.
  • the heating coil may be arranged at the exterior around the anode so that the supply of heat to the cathode takes place across the anode.
  • use is preferably made of a. cathode which is very thin. This affords the advantage that the electric field strength perpendicular to the cathode may obtain a high value and this high Value of the field strength causes again that the alternating current resistance of the whole diode is altered.
  • the alternating current impedance of the saturated diode which at first seems to be infinitely high, depends in reality on the absolute temperature and on the electric field strength at the surface of the cathode.
  • a denotes a constant, T the absolute temperature and F the field strength perpendicular to the cathode surface.
  • heating of the latter is of course unavoidable but a heated anode has no harmful effect on the working of the diode, even not if the temperature is so high that the anode begins to emit, for after being emitted the electrons immediately attain an electrostatic field which drives them back to the anode.
  • FIG. 1 and 2 represent diagrammatically an approved form of the apparatus and a modification thereof.
  • the diode 5 is connected in the direct
  • the diode comprises a fine wire cathode 8, an anode 9 surrounding the cathode and a heater coil l0 wound around the exterior of the anode.
  • the anode or B battery II is connected to the anode 9 of the diode 5.
  • The. direct currentcircuit for the device I is from the positive side of the battery H to anode 9, cathode 8, through circuit 6 to the anode of device I through ground to the negative side of battery H.
  • the cathode 8 is surrounded by a heater element I2 which comprises the anode of the device. Otherwise the circuit of Fig. 2 is the same as the circuit of Fig. 1.
  • the invention is applicable to high frequency as well as low frequency amplifier circuit arrangements of any kind, quite independently of the purpose for which the apparatus having such a circuit-arrangement is utilized.
  • the invention may also'be applied in order to couple the anode circuit of a detector valve with the succeeding low frequency amplifier or with a telephone or other indicator.
  • An electron discharge device comprising a cylindrical anode, a cathode extending within the anode, and means disposed externally of the anode and supported thereby for heating said cathode, said heating means being in the form of a bifilar winding adapted to be energized from an alternating current source.
  • An electron discharge device comprising a cylindrical anode, a cathode extending within the anode, and means supported from the outer surface of the anode for heating said cathode solely by heat radiation, said heating means being in the form of helically-wound parallel wires adapted to be energized from an alternating current source.
  • An electron discharge device comprising a cylindrical tubular anode closed at one end, a cathode extending within the anode from the opposite end and coaxially disposed therein, and means carried by the outer surface of the anode for heating said cathode solely by heat radiation, said heating means being in the form of a pair of. parallel wires helically-wound and adapted to be energized from an alternating current source.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Microwave Tubes (AREA)
  • Electronic Switches (AREA)
  • Microwave Amplifiers (AREA)
US678040A 1930-06-21 1933-06-28 Electron discharge device Expired - Lifetime US2092881A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE380459D BE380459A (en(2012)) 1930-06-21
NL34771D NL34771C (en(2012)) 1930-06-21
DEN32221D DE563558C (de) 1930-06-21 1931-06-13 Verstaerkerschaltung, bei welcher der Anodengleichstrom ueber eine gesaettigte Zweielektrodenroehre gefuehrt wird
GB17374/31A GB369480A (en) 1930-06-21 1931-06-15 Improvements in or relating to thermionic amplifier circuit-arrangements with parallel feeding
US678040A US2092881A (en) 1930-06-21 1933-06-28 Electron discharge device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL369480X 1930-06-21
US545946A US1957542A (en) 1930-06-21 1931-06-22 Amplifying circuit arrangement with parallel supply
US678040A US2092881A (en) 1930-06-21 1933-06-28 Electron discharge device

Publications (1)

Publication Number Publication Date
US2092881A true US2092881A (en) 1937-09-14

Family

ID=31998808

Family Applications (1)

Application Number Title Priority Date Filing Date
US678040A Expired - Lifetime US2092881A (en) 1930-06-21 1933-06-28 Electron discharge device

Country Status (5)

Country Link
US (1) US2092881A (en(2012))
BE (1) BE380459A (en(2012))
DE (1) DE563558C (en(2012))
GB (1) GB369480A (en(2012))
NL (1) NL34771C (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU632568B2 (en) * 1989-04-17 1993-01-07 Foot-Joy, Inc. Shoe sole embossed composition and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE757106C (de) * 1937-04-01 1953-02-23 Siemens & Halske A G Strahlungsgekuehlter Heissleiter zur Regelung sehr kleiner Leistungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU632568B2 (en) * 1989-04-17 1993-01-07 Foot-Joy, Inc. Shoe sole embossed composition and method

Also Published As

Publication number Publication date
DE563558C (de) 1932-11-07
NL34771C (en(2012))
GB369480A (en) 1932-03-24
BE380459A (en(2012))

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