US2314813A - Feedback amplifier circuits - Google Patents

Feedback amplifier circuits Download PDF

Info

Publication number
US2314813A
US2314813A US222092A US22209238A US2314813A US 2314813 A US2314813 A US 2314813A US 222092 A US222092 A US 222092A US 22209238 A US22209238 A US 22209238A US 2314813 A US2314813 A US 2314813A
Authority
US
United States
Prior art keywords
voltage
feedback
resistors
grid
tubes
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
US222092A
Other languages
English (en)
Inventor
Donald S Bond
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
Priority to BE435690D priority Critical patent/BE435690A/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US222092A priority patent/US2314813A/en
Application granted granted Critical
Publication of US2314813A publication Critical patent/US2314813A/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
    • H03F3/34—DC amplifiers in which all stages are DC-coupled
    • H03F3/36—DC amplifiers in which all stages are DC-coupled with tubes only

Definitions

  • vIt is a further object of this invention to provide a; direct current amplier which is substantially independent of variations in supply potentials.
  • FIG. 1 is a schematic drawing of one embodiment of my invention.
  • Figure 2 is a graph showing the input voltage versus plate'voltage characteristic of the device illustrated in Fig. l with andwithout feedback.
  • nals I, 3'a re connected, respectively, to the grids 5 and 'I of a pair of amplier triodes 9 and Il.
  • pair of resistors I3 and I5 are connected in series between the grids 5 and 'I.
  • the midpoint of the resistors I3 and I5 is connected to the negative terminal of an anode supply battery I'I, and also to both cathodes I9 and 2l through a bias resistor 23.
  • a pair of feedback resistors 25 and 21 arerespectively connected between the grids 5 and 'I and the anodes 29 and 3l of the vacuum tubes.
  • a pair of output terminals 33 and 35 are respectively connected to the two anodes 29 and 3
  • a pair of plate load resistors 31 and 39 are connected in series between the anodes 29 and 3
  • the amount of feedback voltage can bemade suiiicient to reduce to any desired value variations in gain due to changes in the amplification factor of the Vacuum tubes or due to variations in line voltage land other causes.
  • resistors 25 and 21 are of the order of 1.5 megohms.
  • Resistors I3 and I5 are of the order of 1.2 megohms.
  • the overall amplification is maintained unione stage, it is evident that further similar stages may be added.
  • I also prefer the push-pull arrangement illustrated, but it is evident that the feedback method illustrated is applicable to a form in the presence of varying factors which The curve is linear only over a limited range.
  • a direct current amplifier comprising two space discharge tubes each provided with a cathode, a, control grid, and an anode, a common power supply for said tubes, a common cathode resistol ⁇ connected between both of said cathodes and one terminal of said power supply, a pair of grid resistors respectively connected ,between each of said control igrids and said one power supply terminal, means for applying an input current symmetrically to said pair of resistors so as to vary the voltages of said control grids in opposite directions with respect to said one power supply terminal in response to variations in' said input current, and two feedback resistors, each connected between the anode and the grid of one of said tubes, cooperating with the respective grid resistors to provide a feedback path for each of said tubes whereby a portion of the output voltage of each of said tubes'is applied to the control grid thereof to oppose variations in the voltage of said control grid.
  • a direct current amplifier comprising two space discharge tubes each provided with a cathode, a control grid, and an anode, a common power supply for said tubes, a common cathode resisto; ⁇ connected between both ofsaid cathodes and one terminal of said power supply, a pair of grid resistors respectively connected between each of said control grids and said one power supply terminal, means for applying an inputl current symmetrically to said pair of grid resistors so as to vary the voltages of s aid control ,grids in opposite directions with respect to said power supply terminal in response to variations in said input current.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US222092A 1938-07-30 1938-07-30 Feedback amplifier circuits Expired - Lifetime US2314813A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE435690D BE435690A (enrdf_load_stackoverflow) 1938-07-30
US222092A US2314813A (en) 1938-07-30 1938-07-30 Feedback amplifier circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US222092A US2314813A (en) 1938-07-30 1938-07-30 Feedback amplifier circuits

Publications (1)

Publication Number Publication Date
US2314813A true US2314813A (en) 1943-03-23

Family

ID=22830785

Family Applications (1)

Application Number Title Priority Date Filing Date
US222092A Expired - Lifetime US2314813A (en) 1938-07-30 1938-07-30 Feedback amplifier circuits

Country Status (2)

Country Link
US (1) US2314813A (enrdf_load_stackoverflow)
BE (1) BE435690A (enrdf_load_stackoverflow)

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
DE1083329B (de) * 1957-08-16 1960-06-15 Liechti Ag Fred Zumindest zweistufiger galvanisch gekoppelter Gegentaktverstaerker
US3039062A (en) * 1959-10-26 1962-06-12 Capitol Records Balance control system for stereo amplifier

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
DE1083329B (de) * 1957-08-16 1960-06-15 Liechti Ag Fred Zumindest zweistufiger galvanisch gekoppelter Gegentaktverstaerker
US3039062A (en) * 1959-10-26 1962-06-12 Capitol Records Balance control system for stereo amplifier

Also Published As

Publication number Publication date
BE435690A (enrdf_load_stackoverflow)

Similar Documents

Publication Publication Date Title
US2401779A (en) Summing amplifier
US2310342A (en) Balanced direct and alternating current amplifiers
GB771083A (en) Improvements in or relating to electronic differential amplifiers
GB536089A (en) Improvements in or relating to thermionic valve amplifiers
US2590104A (en) Direct-coupled amplifier
US2246331A (en) Thermionic valve amplifier
US3262066A (en) Amplifier circuit
US2441387A (en) Electronic squaring circuit
US2314813A (en) Feedback amplifier circuits
US3622902A (en) Fet differential amplifier
US2390824A (en) Phase inverter
US2638512A (en) Direct coupled amplifying system
US2714137A (en) Stabilized amplifier
US3806823A (en) Differential amplifier
US2525632A (en) Low-frequency amplifier
US3325742A (en) Hybrid amplifier circuit
US2404099A (en) Amplifying system
US2154200A (en) Voltage regulator device
US2313097A (en) System fob
US3289094A (en) Differential amplifier
US2252007A (en) Thermionic amplifier
US3299367A (en) Feedback amplifier
US2833871A (en) Phase inverter
US2768250A (en) Direct coupled amplifier
US2631200A (en) Gain control circuit