GB917194A - Improvements in or relating to negative feedback transistor amplifiers - Google Patents

Improvements in or relating to negative feedback transistor amplifiers

Info

Publication number
GB917194A
GB917194A GB1909361A GB1909361A GB917194A GB 917194 A GB917194 A GB 917194A GB 1909361 A GB1909361 A GB 1909361A GB 1909361 A GB1909361 A GB 1909361A GB 917194 A GB917194 A GB 917194A
Authority
GB
United Kingdom
Prior art keywords
stage
feedback
resistor
output stage
voltage
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
Application number
GB1909361A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB917194A publication Critical patent/GB917194A/en
Expired legal-status Critical Current

Links

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
    • H03F1/347—Negative-feedback-circuit arrangements with or without positive feedback using transformers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

917,194. Transistor amplifier circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. May 26, 1961 [May 30, 1960], No. 19093/61. Class 40 (6). [Also in Group XXXIX] The parallel connected transistor of the output stage of an amplifier move particularly for a telephone repeater, have a common emitter resistor across which a voltage is applied proportional to the voltage across the load so that feedback applied by this resistor to the output stage and from this resistor to an earlier stage is proportional both to the current and the voltage in the load. A telephone line connected at terminals 1 is coupled through a choke 2 and a filter 3 to the input of a common emitter stage 4. This is D.C. coupled to a second stage 5 feeding an output stage comprising two transistors 9, 10 in parallel having the primary winding of output transformer 11 connected to their collectors. Feedback to a common emitter resistor 7 is provided from a tertiary winding through a resistor 19 whereby negative feed back is provided around the output stage. A further feedback circuit through resistor 8 provides both current and voltage feedback to the input stage. Network 3 and negative feedback network 13 equalize the attenuation of the cable, the latter network having a high impedance compared with the emitter impedance of transistor 4 so that its frequency characteristic has no effect on the feedback from the output stage. D.C. stabilization is effected by the main feedback path, by feedback to the first stage base from the second stage emitter resistor 17 and by the provision of individual output stage emitter resistors 14 and 15.
GB1909361A 1960-05-30 1961-05-26 Improvements in or relating to negative feedback transistor amplifiers Expired GB917194A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN18422A DE1160013B (en) 1960-05-30 1960-05-30 Counter-coupled transistor amplifier

Publications (1)

Publication Number Publication Date
GB917194A true GB917194A (en) 1963-01-30

Family

ID=7340598

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1909361A Expired GB917194A (en) 1960-05-30 1961-05-26 Improvements in or relating to negative feedback transistor amplifiers

Country Status (3)

Country Link
CH (1) CH402953A (en)
DE (1) DE1160013B (en)
GB (1) GB917194A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1088251A (en) * 1965-01-06 1967-10-25 Marconi Co Ltd Improvements in or relating to transistor amplifiers
DE1289119B (en) * 1967-02-21 1969-02-13 Siemens Ag Counter-coupled transistor broadband amplifier
NL148461B (en) * 1967-11-06 1976-01-15 Philips Nv DEVICE WITH A TRANSISTOR AMPLIFIER CONTAINING AN INPUT AMPLIFIER STAGE AND A POWER AMPLIFIER STAGE.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE535593A (en) * 1954-02-10
FR1150841A (en) * 1956-04-24 1958-01-20 Telecommunications Sa Even-order non-linear distortion reduction device in transistron amplifiers

Also Published As

Publication number Publication date
DE1160013B (en) 1963-12-27
CH402953A (en) 1965-11-30

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