US2088439A - Impedance regulating system - Google Patents

Impedance regulating system Download PDF

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Publication number
US2088439A
US2088439A US450111A US45011130A US2088439A US 2088439 A US2088439 A US 2088439A US 450111 A US450111 A US 450111A US 45011130 A US45011130 A US 45011130A US 2088439 A US2088439 A US 2088439A
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Prior art keywords
tube
grid
anode
cathode
resistance
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Expired - Lifetime
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US450111A
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English (en)
Inventor
Rothe Horst
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Telefunken AG
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Telefunken AG
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/14—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit

Definitions

  • An object of the present invention is to disclose ways andy $5 means of creating both capacities as well as inductances suited also for extremely high frequencies, and which follow changes in electrical conditions practically without inertia, such variations, ii desired, being accomplished from a remote point.
  • s5- Fig. 1 illustrates generally and schematically the principles involved in the invention.
  • FIG. 2 through 6 illustrate practical examples of some of the uses to which the invention may be put.
  • a complex resistance Rsch is transferred between control grid and filament of the tube, when the grid and the plate are associated by a resistance Rga, the size of the latter being readily determined mathematically if desired.
  • the resistance transferred between grid and filament as a circuit element is utilized to obtain the desired variation, the variation of said quantity being insured by varying the plate resistance Ra or the internal tube resistance Ri between the anode and-n1ament,or both, this being accompushame by simple means.
  • the variations of resistance Ra or Ri may follow modulating potentials.
  • Fig. 3 illustrates another conceivable circuit arrangement in which between the grid and the plate of the tube I is a capacity Cga.
  • 'Ihe plate resistance Ra in this modification consists of the cathodeto anode resistance of tube 2.
  • the grid biasing potential Eg of the tube 2 it can be altered within wide limits. It can be easily found by calculation that the resistance transferred between grid and filament in tube l consists of a capacity and a positive ohmic resistance in shunt relation thereto, the size of both components being predicated upon Ra.
  • D denotes the reciprocal amplification factor.
  • the circuit schemes shown in Figs. 2 and 3 are unsuited for extremely high frequencies.
  • the plate resistance (impedance) as shown in Fig. 4 must 55 consist of an oscillation circuitthe damping of which is inuenced by means of tube 2.
  • the resistance Rsch can be calculated as above indicated.
  • the capacitive component then changes also inside the limits above given, while the ohmic'component must assume either positive or negative values according to whether the impedance of the oscillation circuit is ohmic, reactive or inductive.
  • an inductive reactance between grid and filament is obtainable also by means of a neutralized circuit scheme as illustrated in Fig. 6.
  • the condenser CN is greater than the inherent grid plate capacity Cga
  • the resistance transferred in this arrangement, Rsch contains an inductive and a negative ohmic component. This phase shift of the transferred resistance is obtained by that the transferred resistance is connected with a point of the plate circuit where the potential presents a phase displacement angle of 180 degrees in vrelation to the plate potential.
  • a device for producing an impedance which may be varied linearly in accordance with potential variations comprising, a thermionic tube having a control grid, a cathode and an anode, an impedance connected between said anode and control grid, a variable resistance connected in parallel with the internal impedance of the tube between said anode and cathode of said tube, andadeviceconnected with said variable resistance and energized by said potential variations for varying said resistance in accordance with said potential variations whereby resistance effects are produced between said control grid and cathode which are linear with respect to said potentials.
  • Means for producing an impedance which varies linearly with respect to modulation potential variations comprising, a thermionic tube having a control grid, a cathode and an anode, a reactance connected between said anode and control grid, and a variable resistance connected in parallel with the internal impedance between the anode and cathode of said tube comprising an additional thermionic tube having its anode electrode connected with the anode of said rst named tube and its input electrodes connected to a source of modulating potentials, whereby impedance effects which vary in accordance with said modulating potentials are produced between the control grid an ⁇ d cathode of said rst named tube which are linear with respect to said modulating potentials.
  • a device for producing an electrical characteristic which may be varied linearlyu in accordance with potential variations comprising, a thermionic tube having a control grid, a cathode and an anode, a capacity connected between said anode and control grid, a reactance connected in parallel with the anode to cathode impedance of said tube, and a variable resistance connected in parallel with the internal impedance between the anode and cathode of said tubecomprising an additional.
  • tube having its anode to cathode impedance connected in parallel to said reactance and its control grid connected to a. source of potentials which vary, whereby resistance effects are produced between said control grid and cathode of said tlrst named tube which are linear with respect to said potentials which Vary.
  • a device for producing an electrical characteristic which may be varied directly in accordance with modulating potential variations comprising, athermionic-tube,having -an anode, a
  • a device as recited in ⁇ claim 4 in which said inductance connected between the control grid and anode of said rst named-tube is in series with a capacity.
  • a circuit of variable reactance comprising a vacuum tube including a. cathode, an anode, and a, grid and having reactive coupling between said anode and grid, and a second vacuum tube connected as an output resistor between the anode and cathode of said rst tube, said second tube being variable in resistance to produce consonant Variations in reactance between the cathode and grid of said rst tube.
  • a circuit of Variable reactance comprising a vacuum tube including a cathode, an anode, and a grid, a reactive element connected between said grid and anode, and a second vacuum tube connected as an output resistor between the anode and cathode of said rst tube, said second tube being variable in resistance to produce consonant variations ⁇ in reactance between the lcathode and grid of said first tube.
  • a circuit of variable reactance comprising a. vacuum tube including a cathode, an anode, and a grid, an inductance connected between said cathode and anode, and a second vacuum tube connected as an output resistor between the anode and cathode of ⁇ said first tube, said second tube being variable in resistance to produce consonant variations in reactance between the cathode and grid of said first tube.
  • a variable reactance circuit comprising a vacuum tube including a cathode, an anode, and a grid, and having reactive coupling between said anode and grid, a second vacuum tube connected as an output resistor between said anode and cathode, and means for cyclically varying the effective resistance of said second tube to produce corresponding variations in the effective cathode-grid reactance of said rst tube.
  • a circuit of variable impedance comprisin a vacuum tube including a. cathode, an anode, and a ⁇ grid, an impedance element connected between said grid and anode, and a second vacu- -electrical characteristic of the unit for producing desired changes in the value of said capacity.
  • a variable electronic condenser unit comprising. an electron discharge tube having at least a. cathode, grid and anode, the grid circuit of the tube comprising the condenser, condensive means common to the grid and anode circuits of the tube for providing a predetermined capacity in said condenser, and means for adjusting an electrical characteristic o! the unit for producing desired changes in the value of said capacity.
  • An adjustable condenser unit comprising a tube having at least a cathode and two cold electrodes, the circuit between the cathode and one of the cold electrodes comprising the condenser, a. capacitance common to both of said cold electrodes for producing.a desired capacity value in the said condenser, and means for varying an electrical characteristic of the unit for changing the said value.
  • An adjustable lcondenser unit comprising a tube having at least a cathode and two cold electrodes, the circuit between the cathode and one of the cold electrodes comprising the condenser, a capacitance common to both of said cold electrodes for producing a desired capacity value in the said condenser, and means for varying an electrical characteristic of the unit, such as the amplication factor oi the tube, for changing the said value.
  • a variable condenser unit comprising a tube provided with a cathode, plate and control electrode, the circuit between the cathode and control electrode comprising the condenser, a condenser connected between the plate and control electrode to augment the capacity of said f' in the said capacity.
  • An adjustable voltage operated capacitance comprising a tube provided with a cathode and at least a grid and plate, the capacity between the grid and cathode comprising-the said capacitance, auxiliary capacitance being provided between the grid and plate to augment the value of said iirst capacitance, and means for adjusting the space current now oi the tube in a predetermined manner for producing desired variations in the value of said first capacitance.

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US450111A 1929-05-11 1930-05-06 Impedance regulating system Expired - Lifetime US2088439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2088439X 1929-05-11

Publications (1)

Publication Number Publication Date
US2088439A true US2088439A (en) 1937-07-27

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US450111A Expired - Lifetime US2088439A (en) 1929-05-11 1930-05-06 Impedance regulating system

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US (1) US2088439A (fr)
FR (1) FR690417A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510787A (en) * 1947-05-16 1950-06-06 Rca Corp Variable reactance circuit
US2527535A (en) * 1945-12-14 1950-10-31 Jr Robert A Emmett Electronic phase shifter
US2712637A (en) * 1951-04-25 1955-07-05 Robert W Jones Variable reactance circuits
US2742616A (en) * 1949-08-30 1956-04-17 Bell Telephone Labor Inc Negative impedance repeaters
US2946969A (en) * 1958-08-25 1960-07-26 Rosen George System for varying capacitance

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527535A (en) * 1945-12-14 1950-10-31 Jr Robert A Emmett Electronic phase shifter
US2510787A (en) * 1947-05-16 1950-06-06 Rca Corp Variable reactance circuit
US2742616A (en) * 1949-08-30 1956-04-17 Bell Telephone Labor Inc Negative impedance repeaters
US2712637A (en) * 1951-04-25 1955-07-05 Robert W Jones Variable reactance circuits
US2946969A (en) * 1958-08-25 1960-07-26 Rosen George System for varying capacitance

Also Published As

Publication number Publication date
FR690417A (fr) 1930-09-19

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