US1893302A - Method of and means for controlling electric wave amplifiers - Google Patents

Method of and means for controlling electric wave amplifiers Download PDF

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Publication number
US1893302A
US1893302A US286772A US28677228A US1893302A US 1893302 A US1893302 A US 1893302A US 286772 A US286772 A US 286772A US 28677228 A US28677228 A US 28677228A US 1893302 A US1893302 A US 1893302A
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United States
Prior art keywords
amplifier
grid
wave
space discharge
amplitude
Prior art date
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Expired - Lifetime
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US286772A
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English (en)
Inventor
Peterson Eugene
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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Publication date
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US286772A priority Critical patent/US1893302A/en
Priority to DEI38430D priority patent/DE665496C/de
Application granted granted Critical
Publication of US1893302A publication Critical patent/US1893302A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • This invention relates to a method of and means for reducing modulation efiects or distortion in amplifiers and controlling the gain thereof, particularlyin space discharge amplifying tubes connected in push-pull relaion.
  • Annplifiers employingsp ace discharge tubes are commonly operated with a C battery or other source of constant negative grid bias.
  • the amplifier When a grid condenser and resistance combination is employed in conjunction with tubes operated singly or'in parallel, the amplifier may be operated without material 9 distortion provided the amplitude of the input wave does not exceed a more or less definite value. When, however, the amplitude of the input wave is increased beyond a certain value, the amount of distortion progressively increases. The same result has been observed in an amplifier including pushpull connected space discharge tubes having their grids biased with respect to. their cathodes by the application of a constant 9 negative voltage.
  • the useful range of input values is materially extended. That is, the range of amplitude of the input wave which the amplifier can satisfactorily amplify without increasing distortion, is materially widened.
  • An object of the present invention isto de- 1928.
  • Another object is :to causc,in asubstantially distortionless amplification system, a decreasing gain when the value of the input increases beyond a predetermined value.
  • Fig. 4 shows corresponding characteristics of" an amplifier embodying the present invention.
  • the fractional value of the portion of the applied wave effective to produce grid current depends inversely upon the ratio between the resistance of element 6 and the internal grid-to-cathode resistance of the space discharge-device. In a given case, by increasing the value of resistance 6 the portion of the wave effective on the grid can be made as small as may be desired, within practical limits. In this way the maximumvalue of grid current produced by applied Waves of the largest amplitude for which the amplifier is intended may be made negligibly small.
  • any one of a'p'lurality of suit able impedance networks may be used to couple input transformer 3 to devices 1 and 2.
  • the'essential requirements for an alternative network' are that it provide a conductive path and additional electrostat c capacity between the terminals of the disa charge devices, unless the internal capacity is found to be already of a suitable value before insertion of the network.
  • the values of leakage resistance and time constant for an alternative network are to be determined in accordance with t-he rules hereinbefore stated for network 5, 6.
  • the amplitude of wave A is such as to traverse the segment 00a of any characteristic 13 to which it is applied in'Figs. 2 to 4.
  • Simiwave B traverses segment 6-?) and wave C traverses segment cc.
  • 'Ihe amplitudes of waves A, B and C in the respective figures are equal.
  • Fig. 2 shows typical operating characteristics for a push-pull amplifier of the type heretofore proposed and now well known in the art, such, for example, as might be represented by the amplifier of Fig. 1, omitting network '56. 7
  • Segments 6-?) and cc depart progressively from rectilinearity by including the curved portions shown at either side of the straight part of curve 13. Consequently the waves B and C will be amplified wit-h increasing amounts of distortion.
  • F ig. 3 shows typical operating characteristics for an amplifier comprising two discharge devices similar to those shown in Fig. l but connected in parallel instead of in pushpull relation and providedwith a network such as network 56 for supplying additional negative grid bases when waves of large amplitude are applied.
  • Curvell is identical with'the similarly numbered curve in Fig. 2 and, as before, is the characteristic ofan individual discharge device.
  • An amplifier of alternating current comprising a plurality of space discharge devices connected in push-pull relation, each of said space discharge devices having a cathode, an
  • An amplifier of alternating current comprising a plurality of space discharge devices connected in push-pull relation, each of said space discharge devices having a cathode, an anode and a control electrode, input and output circuits for said space discharge devices, means for supplying a substantially constant negative biasing potential to said control electrodes, said means being of such voltage as to prevent conduction of grid current through said space discharge devices when said amplifier is actuated by alternating current within an extended range of normal operating intensities, and a grid leak and condenser in said input circuit for supplying a second biasing potential to said control electro es responsive to grid current whereby a reduction is effected in the trans mission gain of the amplifier when actuated by alternating current of intensities in a sec- 0nd extended range of intensities beyond said first mentioned range while the amplifier is prevented from causing appreclableamount of grid current modulation, said grid leak and condenser combined having a value of time constant which is; large compared with the alternation period of the current amplified.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US286772A 1928-06-20 1928-06-20 Method of and means for controlling electric wave amplifiers Expired - Lifetime US1893302A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US286772A US1893302A (en) 1928-06-20 1928-06-20 Method of and means for controlling electric wave amplifiers
DEI38430D DE665496C (de) 1928-06-20 1929-06-20 Schaltungsanordnung zur Vermeidung der nichtlinearen Verzerrungen bei eingangs- und ausgangsseitig im Gegentakt geschalteten Verstaerkerschaltungen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US286772A US1893302A (en) 1928-06-20 1928-06-20 Method of and means for controlling electric wave amplifiers

Publications (1)

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US1893302A true US1893302A (en) 1933-01-03

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US286772A Expired - Lifetime US1893302A (en) 1928-06-20 1928-06-20 Method of and means for controlling electric wave amplifiers

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US (1) US1893302A (de)
DE (1) DE665496C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831928A (en) * 1948-11-04 1958-04-22 Emi Ltd Amplifier circuit for correcting distortion therein

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965701C (de) * 1953-09-23 1957-06-13 Deutsche Bundespost Verfahren zur Linearisierung von bedienungslosen Verstaerkern fuer Vielkanalanlagen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831928A (en) * 1948-11-04 1958-04-22 Emi Ltd Amplifier circuit for correcting distortion therein

Also Published As

Publication number Publication date
DE665496C (de) 1938-09-29

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