US2022412A - Detector circuit - Google Patents

Detector circuit Download PDF

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Publication number
US2022412A
US2022412A US552632A US55263231A US2022412A US 2022412 A US2022412 A US 2022412A US 552632 A US552632 A US 552632A US 55263231 A US55263231 A US 55263231A US 2022412 A US2022412 A US 2022412A
Authority
US
United States
Prior art keywords
anode
potential
cathode
tube
circuit
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
US552632A
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English (en)
Inventor
Egyed Ladislaus
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2022412A publication Critical patent/US2022412A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
    • H03D1/16—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of discharge tubes

Definitions

  • My present invention relates to frequency changers, and more particularly to a detectoi circuit utilizing plate rectification and comprising screen grid tubes.
  • the screen-grid is connected in a radio frequency screen grid type of tube, when ever the same is to be used as a plate rectifier. directly with the cathode, or filament; or else the screen grid is maintained only at a slightly positive biasing potential in reference to the filament.
  • Fig. 1 shows diagrammatically a circuit embodying the invention
  • Fig. 2 shows a modified form of the invention.
  • i denotes an indirectly heated screen grid tube comprising the cathode 2, the heater filament 3, the control grid 4, the screen grid or shield 5, and the anode 6.
  • Inductance coil 1 and variable condenser 8 constitute the tuned oscillation circuit interposed between the cathode 2 and the control grid 4, the cathode 2 being grounded.
  • the anode circuit of the tube includes resistances 5i and it, and at the end thereof, indicated by a plus sign 5 there is connected the positive pole of the plate potential supply (not shown).
  • the other terminal of the resistance It! is connected with the cathode, or ground, by way of a by pass condenser l I.
  • resistance 22 and the series 10 condenser [3 the anode circuit of the tube is united with the tube of the first audio frequency stage of amplification.
  • tickler coil 14 For regeneration, there is provided the tickler coil 14, and connected in series therewith, for 15
  • the connection between the auxiliary electrode 20 5 and the cathode 2 in the embodiment here shown by way of example, is provided outside the tube, though it will be understood that the same could be disposed also inside the tube. In Fig. 2 the latter construction is shown. 25
  • anode rectifier an electronic device 35 having as elements within an enclosure a cathode, an anode, a control electrode and a screening electrode, said latter electrode being arranged adjacent the anode but intermediate the anode on the one hand and the cathode and control elec- 40 trode on the other hand so as to effectively screen the anode from the elements of said device, said device being adapted to operate along the lower knee of its anode current control grid potential characteristic curve, means for greatly increasing the steepness of the portion of said characteristic curve along which the device operates while maintaining normally a low plate current through the tube to thereby increase the efficiency of the device when utilized for the recti- 50 fication of low amplitude signalling energy which comprises, means for maintaining the auxiliary electrode at a pctential of the order of the oathode potential as regards the other electrodes whereby during operation of said device there exists intermediately adjacent the anode a region through which the major portion of the electronic stream must pass having a potential of the order of the cath

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Electrophonic Musical Instruments (AREA)
US552632A 1930-08-20 1931-07-23 Detector circuit Expired - Lifetime US2022412A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE610057T 1930-08-20

Publications (1)

Publication Number Publication Date
US2022412A true US2022412A (en) 1935-11-26

Family

ID=34625018

Family Applications (1)

Application Number Title Priority Date Filing Date
US552632A Expired - Lifetime US2022412A (en) 1930-08-20 1931-07-23 Detector circuit

Country Status (4)

Country Link
US (1) US2022412A (zh)
DE (1) DE610057C (zh)
FR (1) FR719107A (zh)
NL (1) NL35096C (zh)

Also Published As

Publication number Publication date
NL35096C (zh)
DE610057C (de) 1935-03-05
FR719107A (fr) 1932-02-02

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