US2156649A - Ampljfying detector - Google Patents

Ampljfying detector Download PDF

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Publication number
US2156649A
US2156649A US157674A US15767437A US2156649A US 2156649 A US2156649 A US 2156649A US 157674 A US157674 A US 157674A US 15767437 A US15767437 A US 15767437A US 2156649 A US2156649 A US 2156649A
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United States
Prior art keywords
tube
tubes
detector
resistance
circuit
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Expired - Lifetime
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US157674A
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English (en)
Inventor
Bendel Hermann
Schmid Adolf
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Siemens and Halske AG
Siemens Corp
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Siemens Corp
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Publication of US2156649A publication Critical patent/US2156649A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/02—Details
    • H03D1/06—Modifications of demodulators to reduce distortion, e.g. by negative feedback
    • 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

Definitions

  • the invention disclosed in the pending application, Ser. No. 134,227, filed April 1, 1937, of H. Bendel who is a co-inventor of the present invention concerns an amplifying detector which is linearized by the connection of means insuring a negative feedback between the grid and the plate circuit of the rectifier tube.
  • the exemplified embodiments shown in said above application were concerned with triode tubes.
  • the use of tubes of the said short is attendant with certain inconveniences and difficulties as shall hereinafter be explained in more detail.
  • the inner resistance R1 is 5 shown a great distancefrom the origin and located on the real axis. Now, about the origin is described a circle whose area is shown by the shading and inside which the terminal resistance may fall without the above requirements failing of being fulfilled. All that is required for the terminal impedance is the condition that it should never assume an order of magnitude the same as R1, regardless of the frequency.
  • FIG. 2 illustrates such a push-pull arrangement comprisgo ing the use of screen-grid tubes.
  • the cathode or filament lead of the tubes contains the linearizing resistances W1 and W1 which produce degeneration, while the plate circuit contains the resistance W2 and W2 which are low in contrast to the inner resistance.
  • the screen grids G2 and G2 serve to insure the requisite high inner resistances and thenecessary slope. They are associated with a tap B of the battery or plate potential source of supply.
  • the invention is not limited to push-pull circuits only but is equally applicable to a single tube stage. In the latter instance the circuit connections will be identical to those shown associated with, for example, the tube R in Fig. 2.
  • Arrangements of the kind here disclosed will be found particularly suited for modulation and demodulation purposes.
  • the exemplified embodiment shown in Fig. 3 is an embodiment of this idea.
  • the tubes are again denoted by R and R, while the linearizing resistances contained in the cathode lead are designated again by W1 and W1, respectively.
  • the denotations for the grids are the same as in the case of Fig. 2.
  • the impressing of the second modulation frequency c may be accomplished either through a third winding of the same transformer or else in a way as illustrated in Fig. 3 through a transformer U2.
  • a transformer U3 which is in coupling relation with the line or the output load.
  • the present invention is not restricted to the use of simple or push-pull circuit schemes. In fact, substantially by the ways and means here disclosed also other circuit combinations are capable of being linearized. Moreover, it is not imperative that simple screen-grid tubes should be employed for any other type of tube comprising more than two grids may be employed, more particularly pentodes.
  • a linear detector system comprising a screen grid tube of comparatively high internal resistance, an un-bypassed resistor connected to the cathode of said tube and included in both the input and output circuits of said tube whereby a degenerative eifect is produced, and an impedance in the output circuit of said tube which has a value of small magnitude as compared to the internal resistance.
  • a detector system for obtaining a substantially linear response comprising a pair of multigrid tubes of high internal resistance connected in push-pull relation, a source of signal potential connected between the signal control grids of said tubes, an un-bypassed resistor connected to the cathode of each tube and included in both the input and output circuits of its respective tube whereby a degenerative effect is produced, an impedance in each of said output circuits which is low as compared to the internal resistance of said tubes, and a pair of output terminals connected to the anodes of said tubes.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Amplifiers (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
US157674A 1936-04-02 1937-08-06 Ampljfying detector Expired - Lifetime US2156649A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201745X 1936-04-02

Publications (1)

Publication Number Publication Date
US2156649A true US2156649A (en) 1939-05-02

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ID=5767841

Family Applications (1)

Application Number Title Priority Date Filing Date
US157674A Expired - Lifetime US2156649A (en) 1936-04-02 1937-08-06 Ampljfying detector

Country Status (4)

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US (1) US2156649A (de)
CH (1) CH201745A (de)
FR (1) FR819807A (de)
GB (1) GB498499A (de)

Also Published As

Publication number Publication date
FR819807A (fr) 1937-10-27
CH201745A (de) 1938-12-15
GB498499A (en) 1939-01-09

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