US1633421A - Means for preventing retrcactive effects in audion amplifier circuits - Google Patents

Means for preventing retrcactive effects in audion amplifier circuits Download PDF

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Publication number
US1633421A
US1633421A US87606A US8760626A US1633421A US 1633421 A US1633421 A US 1633421A US 87606 A US87606 A US 87606A US 8760626 A US8760626 A US 8760626A US 1633421 A US1633421 A US 1633421A
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plate
output
grid
inductance
filament
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Expired - Lifetime
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US87606A
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English (en)
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George A Somersalo
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Individual
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Individual
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Priority to US87606A priority Critical patent/US1633421A/en
Priority to GB3904/27A priority patent/GB265990A/en
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    • 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

Definitions

  • This invention relates to the amplification of electric currents of minute intensities such as experienced in the reception of radio telephonic and telegraphic signals by means a of audion tubes of the three-electrode type, and more particularly to the provision of means for neutralizing, balancing, or otherwise compensating for the inherent capacity coupling between the input and output elecm trodes of the audion tubes of the amplifier.
  • a balanced condition can also be obtained by a different network using a direct connection from the low potential" end of the input in- 445 ductance to the plate through a suitable condenser, and arranging in this connection an inductance which is inductively coupled to the output inductance between the plate and the filament.
  • This coupling is of such character that the ratio of inherent capacitiei between the electrodes of the audion bearsa (361428.111 definite relation to the mutualinductance of this coupling.
  • the network may thus be balanced either by means of a variable condenser which changes the ratio of the inherent capacities of the audion, or by varying the mutual inductance of the coupling.
  • FIG. 1 is a diagram of a network for a single amplifier unit in which my invention is embodied in one form;
  • FIG. 2 is a similar view in which my invention is embodied in another form
  • Figs. 3 and 4 are diagrams of further 55 modified forms.
  • Fig. 1 I have illustrated the usual au ion electrodes, viz, plate 1, grid 2 and filament 3, input inductance 4 and output inductance 5.
  • the input coil 4 is connected at itshi'gh potential end directly with the grid electrode 2. At its low potential end it is connected by line 6 with the plate electrode 1 through an inductance 7 and condenser 8.
  • the output inductance 5 is arranged in the connection 9 from the battery B to the plate 1, the negative side of the battery being connected to the filament 3.
  • the latter is, as usual, energized by its battery A.
  • a tuning condenser T is bridged across the input inductance 4. 1
  • the coils 5 and 7 in the output circuit have a mutual inductance.
  • the ratio of this mutual inductance to the self-inductance of the coil 5 is equal to the ratio of the inherent capacity between the grid and filament electrode to the sum of this capacity plus the capacity between the grid and plate electrodes, the network is balanced.
  • ratio of capacities may thus be made to correspond to the ratio of mutual inductance between the coils 7 and 5 to the self-inductance of the coil 5.
  • connection 12 in which is interposed an appropriate high impedance 13, i. e., either a high resistance or choke coil, which will pass direct current.
  • Fig. 3 I have eliminated the direct connection between the filament and grid through the high impedance 13, and have established a direct current, low voltage connection through the output coil 7 and a supplementary coil 14 which may be also inductively coupled to the coils 5 and 7.
  • This arrangement ma be somewhat more economical to construc since the three coils 5, 7 and 14 may be wound on the same tube.
  • the coil 7 is the balancing coil and is inductively coupled to the coil or coils in the alternating current path between the plate and filament.
  • An audion amplifier network comprising an alternating current plate filament circuit including an output inductance, an input circuit between grid and plate connected to the output circuit at a point between the late and the output inductance and includ- 1n an inductance inductivel coupled to the in uctance in the plate filament circuit whereby to neutralize the inherent capacity of the audion electrodes, and means for preventing high direct current voltage from reaching the grid.
  • An audion amplifier net work comprising an alternating current plate filament circult including an output inductance, an input circuit between grid and plate connected to the output circuit at a point between the plate and the output inductance and including an inductance inductivel coupled to the in uctance in the plate lament circuit, whereby to neutralize the inherent capacity of the audion electrodes by relatively balancing the said capacities against said inductances, means for preventing high direct current voltage from reaching the grid, and means for varying the values of balanced elements of the net work.
  • An audion amplifier network comprising an alternating current plate filament circult including an output inductance, an input circuit between grid and plate connected to the output circuit at a point between the plate and the output inductance and includin an inductance inductively coupled to the in uctance in the plate filament circuit whereby to neutralize the inherent capacity of the audion electrodes, and means for preventing high direct current voltage from reaching the grid, and an external adjustable condenser for varying the ratio between the inherent capacities of the plate grid and filament electrodes.
  • An audion amplifier network comprising an alternating current plate filament circuit including an output inductance, an input circuit between grid and plate connected to the output circuit at a point'between the plate and the output inductance and ineluding an input coil, one terminal of which is connected to the grid and a second coil interposed between the other end of said input coil and the late and inductively coupled to the output inductance whereby to neutralize the inherent capacity of the audionelectrodes, and means for preventing high direct current voltage from reaching the grid.
  • An audion amplifier circuit comprising plate, grid, and filament electrodes, an output coil interposed between-plate and filament electrodes, an input coil, one terminal of which is connected to the grid and the other terminal of which has an alternating current connection to the plate electrode, said connection being established to a point in the output circuit between the plate and the output coil, and a balancing coil arranged in said connection between input coil and plate electrode and inductively coupled to the output coil in the plate-filament circuit whereby to neutralize the inherent capacity of the audion electrodes.
  • Anaudion amplifier circuit comprising plate, grid, and filament electrodes, an output coil interposed-between plate and filament electrodes, an input coil, one terminal of which is connected to the grid and the other terminal of which has an alternating current connection to the plate electrode said connection being established to a point in the output circuit between the plate and the output coil, and a balancing coil arran ed in said connection between input coil and plate electrode and inductively coupled to the output coil in the plate-filament circuit, to ether with means for varying the ratio 0 electrical values between related elements of the network to prevent retroactive eflect of the output circuit upon the input coil.
  • An audion amplifier circuit comprising plate, grid, and filament electrodes, an output coll interposed between plate and filament electrodes, an input coil, one terminal of which is connected to the grid and the other terminal of which has an alternating current connection to the plate electrode, said connection being established to a point in the output circuit between the plate and the output coil, means in the said connection to prevent high direct current voltage from reaching the grid electrode, and a balancin coil arranged in said connection between input coil and plate electrode and inductively coupled to the output coil in the plate-filament circuit whereby to neutralize the inherent capacity of the audion electrodes.
  • An audion receiving system comprising an alternating current plate-filament circuit including an output inductance, an input circuit between grid and plate connected to the output circuit at a point between the plate and the output inductance, a direct current connection between grid and filament, and means for preventing retroaction of the output voltage upon the input circuit including an inductance inductively coupled to the output inductance, said inductance being a part of the input circuit.
  • An audion receiving system comprising an alternating current plate-filament circuit including an output inductance, an input circuit between grid and plate connected to the output circuit at a point between the plate and the output inductance, a direct current connection between grid and filament, means for preventing retroaction of the output voltage upon the input circuit including an inductance inductively coupled to the output inductance, said inductance being a part of the input circuit, and ex- I ternal means for varying the ratio between the inherent capacities of the plate, grid and filament electrodes.
  • An audion receiving system comprising an alternating current plate-filament circuit including an output inductance, an input circuit between grid and plate connected to the output circuit at a point between the plate and the output inductance, a direct current connection between grid and filament, means for preventing retroaction of the output voltage upon the in ut circuit including an inductance in actively coupled to the output inductance, said inductance being a part of the input circuit, and an external condenser connected between the grid and a point in the plate filament circuit.
  • An electric wave receiving and amplifying system employing vacuum. tubes with plate, grid, and filament electrodes, and comprising an alternating current platefilament circuit including an output inductance, a resonant input circuit between grid and plate and connected to the output circuit between the plate and the output inductance, a direct current connection between grid and filament, and means for preventing retroaction of the output voltage upon the resonant circuit including an inductance connected in series with said resonant circuit between grid and plate, and inductively coupled to the output inductance.
  • An electric wave receiving and amplifying system employing vacuum tubes with plate, grid, and filament electrodes, and comprising an alternating current platefilament circuit includin an output inductance, a resonant input circuit between grid and plate and connected to the output circuit between the plate and the. output inductance, a direct current connection between grid and filament, means for preventing retroaction of the output voltage upon the resonant circuit including an inductance connected in series with said resonant clrcuit between grid and plate and inductively coupled to the output inductance, and an external condenser connected between the grid and one of the other electrodes.
  • An electric wave receiving and amplifying system employing vacuum tubes with plates, grid, and filament electrodes, and comprising an alternating current platefilament circuit including an output inductance, a resonant input circuit between grid and plate and connected to the output circuit between the plate and the output inductance, a direct current connection etween grid and filament, means for preventing retroaction of the output Volta e upon the resonant circuit including an in uctance connected in series with said resonant circuit between grid and plate and inductively coupled to the output inductance, and an external condenser connected between the grid and a point of the plate-filament circuit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US87606A 1926-02-11 1926-02-11 Means for preventing retrcactive effects in audion amplifier circuits Expired - Lifetime US1633421A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US87606A US1633421A (en) 1926-02-11 1926-02-11 Means for preventing retrcactive effects in audion amplifier circuits
GB3904/27A GB265990A (enrdf_load_stackoverflow) 1926-02-11 1927-02-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87606A US1633421A (en) 1926-02-11 1926-02-11 Means for preventing retrcactive effects in audion amplifier circuits

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US1633421A true US1633421A (en) 1927-06-21

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US (1) US1633421A (enrdf_load_stackoverflow)
GB (1) GB265990A (enrdf_load_stackoverflow)

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GB265990A (enrdf_load_stackoverflow) 1927-09-29

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