US2212850A - Installation for reducing nonlinear distortion in amplifyng systems - Google Patents

Installation for reducing nonlinear distortion in amplifyng systems Download PDF

Info

Publication number
US2212850A
US2212850A US102274A US10227436A US2212850A US 2212850 A US2212850 A US 2212850A US 102274 A US102274 A US 102274A US 10227436 A US10227436 A US 10227436A US 2212850 A US2212850 A US 2212850A
Authority
US
United States
Prior art keywords
tube
transformer
circuit
output
cathode
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
US102274A
Other languages
English (en)
Inventor
Bernardus D H Tellegen
Henriquez Vivian Cohen
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2212850A publication Critical patent/US2212850A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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 present invention has for its object to improve the arrangement set out in said patent for the case where the load is connected to the amplifier via a so-called output transformer.
  • the improvement consists in that the voltage to be fed back is taken from the secondary side of said output transformer.
  • the supply winding itself or a tertiary winding.
  • feeding back should preferably take place to the input circuit of an amplifying tube preceding a suihciently the end tube in order to obtain strong retroaction.
  • FIG. 1 represents the last two stages of'an amplifier according to the invention while Figures 2 and 3 represent slightly modified arrangements of the load circuit.
  • I and 2 denote cascade-connected amplifying tubes.
  • the voltage to be amplified is supplied to the grid of tube I by connection of a suitable source between the input terminals 20 and M and the anode circuit of this tube is. coupled by means of a condenser 8 and a resistance III with the grid circuit of tube 2.
  • the required negative bias voltages are obtained by means of resistances 2 and 6 respectively which are shunted by condensers 4 and I respectively.
  • the primary winding l2- of a transformer 8 to the secondary winding II of which is connected a load I3.
  • the whole voltage set up across the secondarywinding is supplied to the input circult of the preliminary tube I throughthe intermediary of a lead 5 which is connected to the lower point of the resistance 2.
  • Space current for the tubes I and 2 is supplied by any suitable source represented generally by the batteries 22 and 23 respectively.
  • the amplicatlon from the grid of tube I to theanode of tube 2 was 1200.
  • the ratio of the numbers of turns of the transformer was 30:1.
  • the resistances I4 and I! had a value of 200 and 25 ohms respectively and the inductance vof 0.04
  • a resistance I1 and an inductance I2 is located in parallel with the resistance It.
  • Such a circult-arrangement has to be utilized with the connection of loudspeakers with which it is tial to make the higher frequencies more prominent. It may be obtained in this case that with the higher frequencies the current is kept substantially constant and that with the lower frequencies the voltage is maintained constant withthe result that the lower resonance peak of the loudspeaker is damped. The same effect may be obtained by utilizing a capacity in the load circuit.
  • an output stage including a screen grid tube provided with an input circuit and an output circuit, a transformer connecting said output circuit to the load, a driver circuit for the output stage includeg an electronic tube havingan anode. a cathode and a grid electrode, a source of ing a pair of te. 1
  • said output transformer between the cathode of said tube and a point of fixed potential, said last named connection being arranged to be traversed by the entire space current of said electronic tube, and the potential variations so impressed upon said cathode having a polarity in phase with the potential variations of said grid.
  • an output stage including a first electronic tube provided with an input circuit and an output circuit, means including a transformer for connecting said output circuit to the load, a driver circuit for the output stage including a second electronic tube having an anode, a cathode and a grid electrode, a source of signal energy including a pair of terminals across which the signal energy voltage is available, means for connecting one of said terminals to a point of fixed potential, means for maintaining said grid electrode at the potential of the other terminal of said source, means including a resistor device for connecting the oathode of said electronic tube to a point of the secondary winding of .said transformer, and means for connecting another point of said secondary winding to said point of fixed potential, said two last named means acting to impress at least a part of the voltage developed across the secondary winding of said transformer between the cathode of said tube and the point of fixed potential, said connection between the cathode and the secondary of the transformer being arranged 'to be travers
  • an output screen grid tube having an input circuit and an output circuit, said output circuit including an output transformer across the secondary of which the load is adapted to be-connected, a driver circuit for said output tube comprising an electronic tube having an anode, a cathode and a grid electrode, means adapted to be connected to a source of alternating current energy to be amplified for impressing said energy between the grid electrode of said electronic tube and a point of fixed potential, an
  • cutput'circuit for said electronic tube means for coupling said last named output circuit to the input circuit of said output tube and means including a direct current connection between the cathode of said electronic tube and a point of the secondary winding of said transformer for impressing at leasts a portion of the voltage developed across the secondary of said transformer between the cathode of said electronic tube and the point of fixed potential, the winding of said transformer being so poled and said coupling means being so constituted that the variations of potential impressed on said cathode are in phase with the variations of potential impressed on said grid by said energy.
  • an amplifier for audio frequencies said amplifier being adapted to energize a variable impedance load, a screen grid output tube having an input circuit and an output circuit, a transformer connecting said output circuit to the load, a driver circuit for said screen grid tube including an electronic tube provided with an anode, a cathode and a grid electrode, a pair of terminals one of which is connected to a point of fixed potential and the other thereof being being maintained at a potential which varies with respect to the fixed potential in accordance with signal energy to be amplified, means for maintaining said grid electrode at the potential of said last named terminal, a connection in cluding means for providing less attenuation for audio frequencies in a portion of the audio frequency spectrum than in another portion thereof for impressing at least a portion of the voltage developed across the secondary of said output transformer between the cathode of the tube and said point of fixed potential, said last named connection being arranged to be traversed by the entire space current of said electronic tube, the potential variations so impressed upon said cathode having a polarity in

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US102274A 1935-12-23 1936-09-24 Installation for reducing nonlinear distortion in amplifyng systems Expired - Lifetime US2212850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP2071D DE1080611B (de) 1935-12-23 1935-12-23 Gegengekoppelter Niederfrequenz-verstaerker

Publications (1)

Publication Number Publication Date
US2212850A true US2212850A (en) 1940-08-27

Family

ID=7357710

Family Applications (1)

Application Number Title Priority Date Filing Date
US102274A Expired - Lifetime US2212850A (en) 1935-12-23 1936-09-24 Installation for reducing nonlinear distortion in amplifyng systems

Country Status (5)

Country Link
US (1) US2212850A (en, 2012)
BE (1) BE419102A (en, 2012)
DE (1) DE1080611B (en, 2012)
FR (1) FR815344A (en, 2012)
GB (1) GB466404A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071735A (en) * 1959-06-04 1963-01-01 Blonder Tongue Elect Phase-shift-reducing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071735A (en) * 1959-06-04 1963-01-01 Blonder Tongue Elect Phase-shift-reducing apparatus

Also Published As

Publication number Publication date
FR815344A (fr) 1937-07-09
DE1080611B (de) 1960-04-28
BE419102A (en, 2012)
GB466404A (en) 1937-05-27

Similar Documents

Publication Publication Date Title
GB482740A (en) Improvements in or relating to thermionic valve amplifying circuit arrangements
US2323634A (en) Low frequency amplifier
US2273997A (en) Negative feedback amplifier
US2773136A (en) Amplifier
US2161844A (en) Amplifier cascade with negative feedback
US2198464A (en) Distortion reducing circuit
US2212850A (en) Installation for reducing nonlinear distortion in amplifyng systems
US2167011A (en) Receiving circuit
US1904524A (en) Amplifier
US2361282A (en) Push-pull electron tube system
US2595444A (en) Amplifier
US2239773A (en) Inverse feedback amplifier
US2215439A (en) Amplifier
US1997665A (en) Amplifier
US2544344A (en) Audio amplifier circuit with feedback
US3072860A (en) Transistor amplifier
US2920277A (en) Transistor amplifier
US2174234A (en) Broad band amplifier
US2400734A (en) Direct coupled amplifier
US2191542A (en) Vacuum tube circuits
US1956964A (en) Connection for the operation of high frequency amplification systems
GB489289A (en) Improvements in or relating to thermionic amplifiers
US2155467A (en) High frequency amplifier
US2173232A (en) High frequency amplifier
US2190482A (en) Audio amplifier circuit