US1966221A - Amplifier - Google Patents

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Publication number
US1966221A
US1966221A US575561A US57556131A US1966221A US 1966221 A US1966221 A US 1966221A US 575561 A US575561 A US 575561A US 57556131 A US57556131 A US 57556131A US 1966221 A US1966221 A US 1966221A
Authority
US
United States
Prior art keywords
anode
resistance
grid
direct current
cathode
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
US575561A
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English (en)
Inventor
Rinia Herre
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 US1966221A publication Critical patent/US1966221A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • This invention relates to a circuit arrangement of thermionic tubes in which screen grids are provided, and may be used in radio receiving connections, amplifying connections and the like.
  • Fig. 1 is a diagram illustrating a circuit for compensating for anode potential variations
  • Fig. 2 is a diagram of a modified circuit.
  • reference character 1 denotes a thermionic tube comprising a cathode 2, a control v grid 3, a screen grid 4 and an anode 5.
  • anode is connected through a resistance 6 to the positive pole or" an anode voltage battery 7 whose negative end is connected to the cathode.
  • screen grid is connected to the anode through a resistance 8.
  • the anode voltage and the screen grid voltage may be adjusted to the required value.
  • the alternating currents set up in the screen grid circuit are lead to the cathode through the condenser 9.
  • the case of Fig. 2 will give a greater total impedance in the anode circuit, and, consequently a greater amplification too.
  • the resistances used in Fig. 2 for the same anode and screen grid voltages may be larger than in Fig. 1. This will be better understood by means of the following example. If, for instance, the available anode voltage is 200 volts, whereas the required anode voltage is 100 volts and the required screen grid voltage 50 volts, it being supposed that the average anode current is l milliampere and the average screen grid current 0.3 milliampere, then in the case of Fig.
  • the resistance 6 becomes 77,000 ohms
  • the resistance 8 becomes 170,000 ohms, i. e. for alternating current the total anode impedance corresponds to 53,000 ohms, it being supposed that the condenser 9 so large that it constitutes a short circuit for alternating current.
  • the resistance 6 becomes 86,000 ohms of which the part 10, 11 is 46,000 ohms, Whereas in this case the resistance 8 amounts to 300,000 ohms. This corresponds in the aggregate to an anode impedance of 80,000 ohms. From this example it will be appreciated that a great magnification is achieved thereby. The advantage becomes still greater if the screen grid voltage with respect to the anode voltage is larger than in the case referred to above.
  • a source of signal energy a thermionic tube having output and input circuits, a screen grid tube between the source and said input circuit, a source of anode potential for the screen grid tube, a coupling resistor in the anode circuit of the latter, and means connecting the screen grid to an intermediate point on the coupling resistor.
  • a wave repeater system comprising a space discharge device having cathode, anode and grid electrodes, an input circuit connected between said cathode and a grid electrode, adirect current path between said cathode and said anode, said direct current path including a resistance, and a direct current path between said cathode and a grid electrode including a resistance separate from the first mentioned resistance and a portion only of said first mentioned resistance.
  • a wave repeater system comprising a space discharge device having cathode, anode and grid electrodes, an input circuit for said space discharge device, a source of potential, a resistance having one end connected with the positive side of said source of potential and the other end connected to said anode, and a direct current connection from a point on said resistance intermediate its ends to a grid electrode of said space discharge device.
  • a wave repeater system comprising a space discharge device of the type having anode, cathode and grid electrodes, an input circuit for said space discharge device, a source of potential, resistance means, a direct current connection from a point on said resistance means to the positive side of said source of potential, a direct current connection from another point on said resistance means to said anode, and a direct current connection from a grid electrode of said device to a point on said resistance means intermediate the points connected to said anode and to said source of potential.
  • a wave repeater system comprising a space discharge device of the type having anode, cathode and grid electrodes, an input circuit for said space discharge device, a source of potential, a direct current path from the negative side of said source of potential to said cathode, a direct current path from the positive side of said source of potential to a control electrode of said device including resistance means, and a direct current path from an intermediate point on said resistance means to said anode.
  • a wave repeater system comprising a space discharge device of the type having anode, cathode and grid electrodes, one of said grid electrodes being a screen grid and another being a control grid, input circuit connections extending between said cathode and said control grid, a direct current path between said cathode and said anode, said direct current path including a source of potential and an impedance, a direct current path between said anode and said screen grid, the last mentioned direct current path including a resistor and a portion only of said impedance, and acapacitive reactance element connected between said screen grid and said cathode.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US575561A 1931-05-28 1931-11-17 Amplifier Expired - Lifetime US1966221A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE377635X 1931-05-28

Publications (1)

Publication Number Publication Date
US1966221A true US1966221A (en) 1934-07-10

Family

ID=6344439

Family Applications (1)

Application Number Title Priority Date Filing Date
US575561A Expired - Lifetime US1966221A (en) 1931-05-28 1931-11-17 Amplifier

Country Status (4)

Country Link
US (1) US1966221A (ko)
FR (1) FR736774A (ko)
GB (1) GB377635A (ko)
NL (1) NL36234C (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061794A (en) * 1958-08-15 1962-10-30 Frank W Raucr Distortionless electrical amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061794A (en) * 1958-08-15 1962-10-30 Frank W Raucr Distortionless electrical amplifier

Also Published As

Publication number Publication date
NL36234C (ko)
GB377635A (en) 1932-07-28
FR736774A (fr) 1932-11-28

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