US2035289A - Amplifier circuits - Google Patents

Amplifier circuits Download PDF

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Publication number
US2035289A
US2035289A US657173A US65717333A US2035289A US 2035289 A US2035289 A US 2035289A US 657173 A US657173 A US 657173A US 65717333 A US65717333 A US 65717333A US 2035289 A US2035289 A US 2035289A
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United States
Prior art keywords
circuit
tube
grid
current
distortions
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
US657173A
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English (en)
Inventor
Bartels Hans
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 US2035289A publication Critical patent/US2035289A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/33—Modifications of amplifiers to reduce non-linear distortion in discharge-tube amplifiers

Definitions

  • the present application shows a manner of reducing, or preventing, respectively such distortions by which a considerably more favorable utilization of the preliminary tube and end tube is obtained. Contrary to the hitherto known arrangements an additional circuit is used acting against the distortions, and in turn controlled by the current which produces the distortions so that it is only effective at the moment in which the distorting current develops.
  • Fig. 1 shows one embodiment
  • Fig. 2 shows a modification
  • I and 2 designate two amplifier tubes connected in cascade.
  • 3 is the input transformer; 4 the intermediate transformer and 5 designates the output transformer.
  • the output resistance or load is shown at 6. 1 represents a resistor inserted in the grid circuit of the end tube 2 and 8 is a coupling transformer which couples the grid circuit of tube 2 with the anode circuit.
  • 9 is an additional circuit element, as a tube, for instance, an amplifier.
  • the tube 2 is operated in such manner that an appreciable grid current passes through the tube, then during periods in which current flows in the grid circuit, the anode current of the tube 2 will no longer be proportional to the voltage applied to the grid of tube I.
  • the reason for this is, on the one hand, the influence on the anode current by the grid current appearing in the tube, and, on the other hand, the influence on the voltage of the preliminary tube due to the load caused by the grid circuit of the tube 2.
  • the resistance 1 is placed in the grid circuit, which has no efiect as long as this circuit is not passed by a current, but in the moment, however, in which a current flows through the grid circuit a compensated.
  • linear and non-linear distortions respectively are voltage drop is produced at this resistance.
  • This voltage drop thus proportional to the distorting current, is coupled across an additional element, such as an amplifier, and across the coupling transformer 8 with the output circuit of the tube 2 in such manner that the anode loss which would occur without this auxiliary circuit, is just Thus, the otherwise appearing eliminated.
  • this auxiliary circuit it is possible to considerably increase the efficiency of the preliminary tube and end tube without causing unallowable distortions.
  • Fig. 2 another method is shown. All of the circuit elements are designated by the same reference numerals as in Fig. 1 with the exception that the coupling transformer 8 is not coupled with the anode circuit of tube 2 as showvn in Fig. 1, but with the grid circuit of tube l and that the additional element 9 is dispensed with.
  • a current flows in the grid circuit of tube 2 of this arrangement, which distorts the anode current of tube 2
  • a voltage drop is again produced at the auxiliary resistor l and which is now coupled with the grid circuit of the preliminary tube l across the coupling transformer 8' in such a manner that due to this additional voltage the distortions of the anode current of tube 2 are just compensated.
  • Radio apparatus comprising an amplifying stage including input and output circuits, an element in one of said circuits only, said element being adapted to be traversed by currents depending on distortion in said system, and means for applying a potential having a definite relation to the flow of currents through said element, to a part of said system where it will compensate for the distortion,
  • Radio receiving apparatus including an amplifying stage, input and output circuits for said amplifying stage, a resistor in a part of said input circuit which is not common to said output circuit, and means for applying a potential having a definite relation to the potential difference across the terminals of said resistor due to the flow of grid current in said circuit, to the output circuit to correct for the distortion resulting from the said flow of grid current.
  • a radio frequency amplifying stage including an amplifier tube, input and. output circuits therefor, an impedance element connected to be traversed by grid current flowing in said amplifying stage, said impedance element being connected in a part of said input circuit which is external to said output circuit, and means for impressing potential on the output circuit of said amplifying stage proportional to the flow of grid current.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US657173A 1932-04-12 1933-02-17 Amplifier circuits Expired - Lifetime US2035289A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET40528D DE604024C (de) 1932-04-12 1932-04-12 Verzerrungsfreier Verstaerker

Publications (1)

Publication Number Publication Date
US2035289A true US2035289A (en) 1936-03-24

Family

ID=7981954

Family Applications (1)

Application Number Title Priority Date Filing Date
US657173A Expired - Lifetime US2035289A (en) 1932-04-12 1933-02-17 Amplifier circuits

Country Status (4)

Country Link
US (1) US2035289A (da)
DE (1) DE604024C (da)
DK (1) DK48345C (da)
FR (1) FR753771A (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531935A (en) * 1945-12-14 1950-11-28 Collins Radio Co Level-stabilized modulated carrier amplifier
US2965854A (en) * 1956-02-20 1960-12-20 Bergson Gustav Electro-meter amplifier
US3614644A (en) * 1969-12-15 1971-10-19 Sylvania Electric Prod Amplifier apparatus with distortion compensation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1008777B (de) * 1952-08-19 1957-05-23 Siemens Ag Schaltungsanordnung zur Kompensation einer Gegenkopplung in der Endstufe eines Modulationsverstaerkers
GB853672A (en) * 1957-01-21 1960-11-09 Modern Telephones Great Britai Improvements in or relating to transistor amplifiers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531935A (en) * 1945-12-14 1950-11-28 Collins Radio Co Level-stabilized modulated carrier amplifier
US2965854A (en) * 1956-02-20 1960-12-20 Bergson Gustav Electro-meter amplifier
US3614644A (en) * 1969-12-15 1971-10-19 Sylvania Electric Prod Amplifier apparatus with distortion compensation

Also Published As

Publication number Publication date
DE604024C (de) 1934-10-12
DK48345C (da) 1934-02-05
FR753771A (fr) 1933-10-24

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