US1699110A - Alternating-current amplifier - Google Patents

Alternating-current amplifier Download PDF

Info

Publication number
US1699110A
US1699110A US223961A US22396127A US1699110A US 1699110 A US1699110 A US 1699110A US 223961 A US223961 A US 223961A US 22396127 A US22396127 A US 22396127A US 1699110 A US1699110 A US 1699110A
Authority
US
United States
Prior art keywords
current
devices
anode
alternating
value
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
US223961A
Other languages
English (en)
Inventor
Arthur V Loughren
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to BE354709D priority Critical patent/BE354709A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US223961A priority patent/US1699110A/en
Priority to GB28565/28A priority patent/GB298169A/en
Application granted granted Critical
Publication of US1699110A publication Critical patent/US1699110A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only

Definitions

  • Fig. 1, 1 and 2 represent a pair of electron dischar e devices the grids of which are connecte to opposite extremities of the secondary winding of an input transformer 3, an intermediate point of which is connected through the 'd biasing battery 4 to the cathodes of bot devices.
  • the anodes of these devices are likewise connected to opposite points on the primary winding of the output transformer 5 an intermediate point of which is connected to the positive side of the potential Source 6.
  • the negative side of this source is connected to the cathodes of both devices.
  • an alternating electromotive For the purpose of impressing upon the grids of these devices an alternating electromotive.
  • the operation of the device, with the grid bias thus adjusted, may best be understood by reference to Fig. 2 where I have plotted at 14 a portion of the grid voltage anode current characteristic of the de-. vice. It will be seen that with the grid biased negatively to a value equal to a the anode current will be very small, this value being represented by b.
  • Fig. 2 I While in Fig. 2 I have shown the characteristics of the device with a no load plate current equal to a small value flowing in the output circuits of each device it will, of course, be understood that in many cases an undistorted output may be had even though no plate current flows under no load conditions.
  • Fig. 3 I have shown the form of anodecurrent curve which frequently results when the grid isso adjusted that no anode current flows under no load conditions. It will be seen that the curves 16 and 17., which correspond to the similarly numbered curves of Fig.
  • the areaof triangle ABC is indicative of the power output of a single tube connected in the usual push pull circuit'and operating with a no load anode current equal to CD. -Due to the rated anode dissipation of the tube this value cannot be increased.
  • the grid must swing between values represented by the curves which include points A and E corresponding respectively to zero grid volts and a minimum value determined by the curvature of the anode current .anode voltage characteristic which will not give more than permissible distortion.
  • the amplitude of the alternating current in the plate circuit will then be equal to BC, that of the anode voltage will be equal to AB andthe load resistance will be represented by the slope of the line AC.
  • the triangle FGD represents the output power from a pair of the same tubes operated with the grids biased to cut off in accordance with my invention anode circuit resistance is equal to the internal anode resistance.
  • the tube the operation of which the triangles FGD and ABC are indicative, operated with very approximately the same internal heating whereas the alternating current output represented by the triangle FGD is far greater than that represented by triangle ABC.
  • the tube may be operated ,into a roper external impedance for maximum e ciency since the slope of the line FD is practically equal to that of the anode current voltage characteristics.
  • a pair of three element electron discharge devices means connecting For example in the case ofsubstantially the entire period of alternate alternating half cycles of the alternating current wave when alternating potential is impressed upon the grids.
  • a pair of electron dis charge devices means connecting said discharge devices in push pull relation including an input circuit and an output circuit, means for impressing an alternating potential upon said input circuit for reproduction by said devices in said output circuit, a source of direct current potential connected to bias negatively the grids of said devices during said reproduction the value of said biasing potential being determined by the substantial absence of direct current in the anode circuits of said devices when no alternating potential is impressed upon the grids, said connecting means including a non-resonant output circuit and means for supplying energy from each device to said circuit thereby to combine the output currents from said devices in said non-resonant circuit to reproduce the impressed alternating current wave.
  • a pair of electron dissaid dis charge devices means connecting charge devices in push pull relation including means for impressing an alternating potential upon the control elements thereof, means for impressing a negative direct current potential on each of said control elements of value such that the flow of current from each of said devices during a substantial portion of alternate halfcycles of.
  • the impressed alternating current wave is precludedand such that each device reproduces the other halfcycle of the impressed ioo wave with substantially true wave form
  • a pair. of electron discharge devices means connecting said devices inpush pull relation including an input circuit, means for impressing an alternating current potential upon said input circuit for amplification by said devices and a source of potential connected to biasthe grids of said devices during said amplification sufficiently to reduce t anode current to a value lying in the lower curved portion of the anode current grid voltage characteristic, said connecting means being adapted to combine the output from said devices to produce an alternating current wave.
  • a pair of electron dis charge devices means connecting said devices in push pult relation including an input circuit and an output circuit, means for impressing an alternating current potential upon said input circuit for reproduct-ion by said devices in said output circuit and a source of potential connected to bias the grids of said devices during said reproduction sufficiently to reduce the anode current to a value lying in the lower curved portion of the anode current grid voltage characteristic, said value being determined by the absence of odd harmonics of the impressed wave in the output circuit, said connecting means being adapted. to combine the output from said devices toreproduce the impressed. alternating current Wave.
  • a pair of space discharge devices having control electrodes, means connecting said devices in push pull relation including means for impressing upon the control electrodes thereof alternating current potential for amplification thereby, means for impressing a steady biasing potential upon said grids during said ampli cation of a value such as to cause a small change in anode current from each of said devices during one half cycle of the alternating current wave and com aratively greater change in anode current uring the opposite half cycle, said connecting means being adapted to combine the output from both of said devices to produce an alter nating current wave.
  • a pair of space discharge devices having control electrodes, means connecting said devices in push pull relation including means for impressing upon the control electrodes thereof alternating current potential for reproduction thereby, means for impressing a steady biasing potential upon said grids during said reproduction of a value such as to cause one at said devices to repeat one half cycle 1 of the alternating current Wave and the hand this 3d day of October, 1927.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hybrid Cells (AREA)
  • Particle Accelerators (AREA)
US223961A 1927-10-04 1927-10-04 Alternating-current amplifier Expired - Lifetime US1699110A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE354709D BE354709A (en)van) 1927-10-04
US223961A US1699110A (en) 1927-10-04 1927-10-04 Alternating-current amplifier
GB28565/28A GB298169A (en) 1927-10-04 1928-10-04 Improvements in and relating to alternating current amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US223961A US1699110A (en) 1927-10-04 1927-10-04 Alternating-current amplifier

Publications (1)

Publication Number Publication Date
US1699110A true US1699110A (en) 1929-01-15

Family

ID=22838714

Family Applications (1)

Application Number Title Priority Date Filing Date
US223961A Expired - Lifetime US1699110A (en) 1927-10-04 1927-10-04 Alternating-current amplifier

Country Status (3)

Country Link
US (1) US1699110A (en)van)
BE (1) BE354709A (en)van)
GB (1) GB298169A (en)van)

Also Published As

Publication number Publication date
GB298169A (en) 1930-02-04
BE354709A (en)van)

Similar Documents

Publication Publication Date Title
US2361198A (en) Feedback amplifier
US2516181A (en) High-power audio frequency amplifier
US2161844A (en) Amplifier cascade with negative feedback
US1699110A (en) Alternating-current amplifier
US1985352A (en) Circuit arrangement for electrical amplifiers
US2235677A (en) Amplifier for signal transmission
US2154200A (en) Voltage regulator device
US2600873A (en) Balanced modulator
US2248804A (en) Circuit arrangement and thermionic valve for amplifying electrical oscillations
US2074440A (en) Modulator
US2279661A (en) Wave control and control circuit
US2156659A (en) Amplifier device
US1789364A (en) Method and means for combining and for eliminating frequencies
US2595444A (en) Amplifier
US2443754A (en) Modulator arrangement for carrier wave telegraphy and telephony
US2120800A (en) Transmitter
US2066970A (en) Controlled carrier wave system for signaling
US2772329A (en) Correction of distortion in push-pull amplifiers
US2248462A (en) Modulation system
US2947947A (en) Audio amplifier
US1546875A (en) Electron-discharge apparatus
US2109021A (en) Electrical system
US2080204A (en) Method and means for controlling tube characteristics
US2282347A (en) Modulation system
US2165844A (en) Method and means for modulation