US2313014A - Anticoupled amplifier - Google Patents

Anticoupled amplifier Download PDF

Info

Publication number
US2313014A
US2313014A US336777A US33677740A US2313014A US 2313014 A US2313014 A US 2313014A US 336777 A US336777 A US 336777A US 33677740 A US33677740 A US 33677740A US 2313014 A US2313014 A US 2313014A
Authority
US
United States
Prior art keywords
amplifier
resistances
windings
transformer
input
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
US336777A
Other languages
English (en)
Inventor
Hagen Wolfgang
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2313014A publication Critical patent/US2313014A/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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2200/00—General construction of tables or desks
    • A47B2200/0035—Tables or desks with features relating to adjustability or folding
    • A47B2200/0039—Two position height adjustable table

Definitions

  • This invention relates to amplifiers in which distortions are obviated by negative reaction or so-called anti-coupling, and it aims to improve the function of these devices.
  • Fig. 1 is a diagrammatic view showing a known arrangement
  • Fig. 2 is a diagram representing one embodiment of the invention
  • Fig. 3 is a view similar to Fig. 2 and illustrating a completion of the arrangement there disclosed.
  • A denotes an amplifier of any suitable construction and whose output resistance is designated Ra.
  • U1 denotes an input transformer, while U2 designates an output transformer for this amplifier.
  • Amplifiers of the kind referred to require the terminal resistances of the input and output circuits not to affect the negative reaction, since otherwise the amplifiers may be caused to sing in case of varying the terminal circuits thereof.
  • the input circuit vof prior devices is a bridge connection of the kind shown in Fig. '1. arrangement comprises resistances W1, W2, Ws, W4. These, however, must be high enough to prevent the transformer U1 from being attenuated too much.
  • the/earth capaci# ties C1, C2 of the transformer which are indicated by dotted lines, affect the' phase of the negative reaction path, especially in the case of high frequencies.
  • Such undesired changes in phase should as far as ⁇ possible be kept out of the negative reaction path, since they can cause the amplifier to sing and can be compensated only by complicated phase networks.
  • transformer U1 comprises two symmetrical windings a, b and a, c, loaded with resistances R1, R2. of the two windings.
  • the center point or point of symmetry between the resistances R1, R2 is designated e.
  • These resistances are calculated to provide for a suitable condition of the input circuit but may be high to some extent.
  • the reaction current flowing from. d to a passes through the windings a, b and a, c in opposite directions.
  • the two current components thus produced are equal to one another, whereby there will be no reaction voltage arising at winding b, c.
  • the capacity of the windings of transformer 'Ui is in parallel with the resistances R4, Rs.
  • This arrangement of the input circuit enables the amplifier to be adjusted simply by varying the negative reaction. Such variation may be effected by means of resistances Re, Rv, Fig. 3. which constitute a potentiometer effective with respect to the reaction voltage. R7 is a low ohmic resistance. Adjusting this potentiometer causes the degree of reaction, that is, the amplication, to be regulated in its turn.
  • An input circuit for a negative feed-'back amplifier comprising a transformer, a secondary therefor comprising a pair of symmetrical wind ings connected in series, a pair of loading resistances connected inY series and shuntedacross the outer terminals of said windings, a circuit to ground connected to the junctiorrpoint of said resistances, a circuit connecting the terminals of one of said resistances to the input of the amplifier, and a negative feed-back circuit from said amplifier connected to the junction ⁇ point of said windings.
  • An amplifier comprising input and output terminals, an input circuit therefor comprising a transformer, a secondary therefor comprising a pair of symmetrical windings connected in series, a pair of loading resistances connected in series and shunted across the outer terminals of said windings, a pair of resistances connected in series and shunted across the output terminals of said amplier, a feedback circuit; including a resistance, connected between the junction point of the last mentioned resistances and the junction point of said windings, means for controlling the amount of feedback comprising a resistance connected between the junction of said windings and the junction point of said loading resistances, and circuits connecting the input termifials of said amplifier to opposite terminals of one of said loading resistances.
  • An amplifier comprising input and output terminals, an input circuit therefor comprising a transformer, a secondary therefor comprising a pair of symmetrical windings connected in series, a pair of loading resistances connected in series and shunted across the outer terminals of said windings, a pair of resistances connected in series and shunted across the output terminals of said amplifier, a feed-back circuit including a. resistance for regulating the amount of feed-

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US336777A 1939-04-06 1940-05-23 Anticoupled amplifier Expired - Lifetime US2313014A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE214293X 1939-04-06

Publications (1)

Publication Number Publication Date
US2313014A true US2313014A (en) 1943-03-02

Family

ID=5817929

Family Applications (1)

Application Number Title Priority Date Filing Date
US336777A Expired - Lifetime US2313014A (en) 1939-04-06 1940-05-23 Anticoupled amplifier

Country Status (4)

Country Link
US (1) US2313014A (en, 2012)
CH (1) CH214293A (en, 2012)
FR (1) FR868650A (en, 2012)
NL (2) NL97451B (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573523A (en) * 1946-06-24 1951-10-30 Gen Electric Feedback amplifier
DE820451C (de) * 1950-02-09 1951-11-12 Telefunken Gmbh Niederfrequenzverstaerker mit Spannungsgegenkopplung
US3439280A (en) * 1965-09-23 1969-04-15 Siemens Ag Circuit arrangement for the regulation of dynamics of electrical signals
US3638133A (en) * 1970-04-10 1972-01-25 Bell Telephone Labor Inc Feedback amplifier with bridge-stabilized output impedance

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573523A (en) * 1946-06-24 1951-10-30 Gen Electric Feedback amplifier
DE820451C (de) * 1950-02-09 1951-11-12 Telefunken Gmbh Niederfrequenzverstaerker mit Spannungsgegenkopplung
US3439280A (en) * 1965-09-23 1969-04-15 Siemens Ag Circuit arrangement for the regulation of dynamics of electrical signals
US3638133A (en) * 1970-04-10 1972-01-25 Bell Telephone Labor Inc Feedback amplifier with bridge-stabilized output impedance

Also Published As

Publication number Publication date
FR868650A (fr) 1942-01-09
NL97451B (en, 2012)
NL53937C (en, 2012)
CH214293A (de) 1941-04-15

Similar Documents

Publication Publication Date Title
US2926307A (en) Series energized cascaded transistor amplifier
US2691075A (en) Transistor amplifier with high undistorted output
US2313014A (en) Anticoupled amplifier
US3105198A (en) Transistor amplifier temperature stabilization circuits
US3195064A (en) Transistor power amplifier employing complementary symmetry and negative feedback
US2212337A (en) Electron discharge device circuit
US2870267A (en) Arrangement for scanning and reproducing magnetic fields
US3157839A (en) Transistorized bridge amplifier with a bias compensating circuit therefor
US2212832A (en) Four pole device with nonlinear resistors
US2207259A (en) Voltage regulating system
US2920291A (en) Signal transmission systems
JPS58147215A (ja) 自動利得制御装置
US2941154A (en) Parallel transistor amplifiers
US2252002A (en) Telephone and other electric wave transmission systems
US2615155A (en) Voltage regulator
US2790033A (en) Transistor amplifier circuit
US2294908A (en) Electric wave system
US2694115A (en) Push-pull transistor amplifier with conjugate input and output impedances
US2396531A (en) Electrical coupling circuits
US3100286A (en) Bridge feedback modulator
US2271208A (en) Resistance device
US2885627A (en) Voltage regulating device
US3100877A (en) Transistor amplifier with constant input impedance
US2960660A (en) Feedback amplifier circuit
GB504960A (en) Improvements in or relating to audio frequency thermionic amplifiers