US2183731A - Electron discharge device amplifier - Google Patents

Electron discharge device amplifier Download PDF

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Publication number
US2183731A
US2183731A US83872A US8387236A US2183731A US 2183731 A US2183731 A US 2183731A US 83872 A US83872 A US 83872A US 8387236 A US8387236 A US 8387236A US 2183731 A US2183731 A US 2183731A
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United States
Prior art keywords
input
valve
output
circuit
discharge device
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Expired - Lifetime
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US83872A
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English (en)
Inventor
Wright George Maurice
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RCA Corp
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RCA Corp
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Publication date
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Publication of US2183731A publication Critical patent/US2183731A/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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
    • 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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/33—Modifications of amplifiers to reduce non-linear distortion in discharge-tube amplifiers

Definitions

  • This invention relates to electron discharge device amplifiers and has for its object to provide improved and simple thermionic valve-amplifiers wherein non-rectilinear distortion due to curvature of the characteristic ofan amplifier valve or valves employed is substantially completely compensated for, while at the same time high magnification is obtained.
  • thermionic valve amplifier It is, of course, normally required from a thermionic valve amplifier that it shall reproduce in its output circuit variations of voltage ourrent or power (as the case may be) which ac-- curately correspond to but which are on a magnified scale with relation to variations applied to the input circuit. It is, however, well known that the characteristic curves of thermionic valves as at present available are not absolutely rectilinear, but aremore or less curved, and this curvature if left uncorrected for, results in what may be termed non-rectilinear distortion.
  • energy corresponding to departures from rectilinearity by a valve amplifier is separated out from the output circuit of said amplifier and is applied at a point subsequent to the input circuit thereof in suchv manner and to such a. degree as substantiallyto compensate for the distortionintroduced;
  • the actual output is in effect itself supplemented in the required sense and to the required degree to cause the total output to be a substantially accurate replica on a magnified scale of the input.
  • the invention is thus distinct from the known correcting arrangements wherein correction is applied as 'a supplement to the input energy of a valve stage introducing the distortion, for in carrying out the present invention it is not this input energy which is supplemented but the output energy.
  • Figure 1 illustrates schematif 'cally a circuit diagram used in explaining the invention.
  • Figure 21 s a diagrammatic representation of a 1 preferredembodiment of the invention shown in Figure -1.
  • the tapping point be so selected, since the said tapping point is connected to the grid through two equal resistances l, 8, the mid-point 9 between these two equal resistances will remain at a steady potential irrespective of the input and output variations assuming, of course, that the said two equal resistances are of large value as compared to the input and output resistances l and 5. If, however, as in practice is the case, the valve characteristic is not completely rectilinear the point between the two equal resistances; which point may be termed the neutral point, will not remain at a steady potential, but will fluctuate to an extent which is a measure of the departure from rectilinearity of the valve characteristic.
  • a thermionic valve having an effective magnification (ignoring departures from rectilinearity of characteristic) m; an impedance in the anode circuit of said valve; a tap on said impedance such that the ratio of said impedance to the portion thereof on the side of the tap remote from the anode is m; a high resistance between said tap and the input grid of said valve; an auxiliary valve arranged to have a magnification factor 2m; a connection between the mid-point of said high resistance and the input grid of said auxiliary valve; a second high resistance between the anode of said auxiliary valve and the anode of the first mentioned valve; means for applying signals to be amplified to the input grid of said first mentioned valve; and means for taking off corrected amplified signals from the mid-point of said second high resistance.
  • an electronic tube having an input electrode and an output electrode, said tube having a characteristic certain portions of which depart from a straight line whereby there are introduced into the energy fed through the tube certain distortion components which correspond to the departures from rectilinearity of the tube characteristic, resistance means connected between the output electrode and input electrode of the tube for comparing the output voltage of the tube with the input voltage thereto and producing a potential which is substantially proportional to the distortion component present in the output of the tube, a load circuit connected to said output electrode and means connected between said first named means and the load circuit for impressing upon the load circuit said derived potential in opposite sense to the distortion component present in the output of said tube whereby the distortion component present in the energy fed from the output to the load circuit is substantially balanced out in the load circuit.
  • a space discharge device having an anode, a cathode and an input grid electrode, an anode circuit for said tube including a load impedance element, a tap on said load impedance, a high resistance between said tap and the input grid electrode, an auxiliary space discharge device having an anode, a cathode and a grid electrode, a connection between the mid point of the high resistance and the grid electrode of said second named space discharge device, a second high resistance element connected between the anode of said second named space discharge device and the anode of the first named space discharge device, means for applying signalling energy to the input grid electrode of said first space discharge device, a load circuit provided with an input terminal and means for connecting said input terminal from the midpoint of said second named high resistance element.
  • said load circuit comprises a thermionic tube having an anode, a cathode and a grid electrode and by that 6 In a relay circuit, aspace discharge device the input terminal which is connected'to the midpoint of the second named high resistance element is connected to the grid of the last named tube.
  • an electronic tube amplifier having an input circuit and an output circuit, a potentiometer device connected between said circuits, a second electronic tube having an input circuit and an output circuit, said last named input circuit being energized from a point on said potentiometer at which no voltage exists in the presence of undistorted amplified signals in the output circuit of said first named tube, a utilization device connected both to the output circuit of the first tube and to the output circuit of the second tube, said connections being so adjusted that any amplified products of distortion in the output of the second tube transfer equal and opposite eiiects to said utilization device as the distortion transferred thereto by said first tube.
  • anode circuit for said tube including a load impedance element, a tap on said load impedance, a high resistancebetween said tap and the input grid electrode, an auxiliary space discharge device having an anode, a cathode and a grid electrode, means for connecting the grid electrode of said second named space discharge device to an intermediate point of said high resistance, a second high resistance element connected between the anode of the second named space discharge device and the anode of the first named device, means for applying signalling energy to the input electrode of said first device, a load circuit provided with an input terminal, and means for connecting said input terminal to an intermediate point of the second named high resistance element.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)
US83872A 1935-06-21 1936-06-06 Electron discharge device amplifier Expired - Lifetime US2183731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17927/35A GB458449A (en) 1935-06-21 1935-06-21 Improvements in or relating to electron discharge device amplifiers

Publications (1)

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US2183731A true US2183731A (en) 1939-12-19

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US83872A Expired - Lifetime US2183731A (en) 1935-06-21 1936-06-06 Electron discharge device amplifier

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BE (1) BE416178A (en(2012))
GB (1) GB458449A (en(2012))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751442A (en) * 1952-09-26 1956-06-19 Bell Telephone Labor Inc Distortionless feedback amplifier
US2777904A (en) * 1952-04-11 1957-01-15 Bendix Aviat Corp Constant output amplifier
US2838618A (en) * 1955-03-31 1958-06-10 Gen Electric Noise cancelling circuit
US2944105A (en) * 1956-10-19 1960-07-05 Hazeltine Research Inc Signal-translating apparatus for modulated wave signals
US3317851A (en) * 1963-07-18 1967-05-02 Julie Res Lab Inc Frequency and amplification stabilized high power amplifier
US3906384A (en) * 1973-02-12 1975-09-16 Cambridge Res & Dev Group System for nullifying signal processor distortions

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777904A (en) * 1952-04-11 1957-01-15 Bendix Aviat Corp Constant output amplifier
US2751442A (en) * 1952-09-26 1956-06-19 Bell Telephone Labor Inc Distortionless feedback amplifier
US2838618A (en) * 1955-03-31 1958-06-10 Gen Electric Noise cancelling circuit
US2944105A (en) * 1956-10-19 1960-07-05 Hazeltine Research Inc Signal-translating apparatus for modulated wave signals
US3317851A (en) * 1963-07-18 1967-05-02 Julie Res Lab Inc Frequency and amplification stabilized high power amplifier
US3906384A (en) * 1973-02-12 1975-09-16 Cambridge Res & Dev Group System for nullifying signal processor distortions

Also Published As

Publication number Publication date
GB458449A (en) 1936-12-21
BE416178A (en(2012))

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