GB765398A - Improvements in or relating to transistor circuits having variable amplification - Google Patents

Improvements in or relating to transistor circuits having variable amplification

Info

Publication number
GB765398A
GB765398A GB4922/55A GB492255A GB765398A GB 765398 A GB765398 A GB 765398A GB 4922/55 A GB4922/55 A GB 4922/55A GB 492255 A GB492255 A GB 492255A GB 765398 A GB765398 A GB 765398A
Authority
GB
United Kingdom
Prior art keywords
relating
base
resistor
transistor circuits
variable amplification
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
GB4922/55A
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 GB765398A publication Critical patent/GB765398A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices
    • H03G3/12—Manually-operated control in untuned amplifiers having semiconductor devices incorporating negative feedback

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

765,398. Transistor gain control circuits. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 18, 1955 [Feb. 23, 1954], No. 4922/55. Class 40(6) In an amplifier in which an input from source 1 is applied to the base of a transistor 3 and a negative feedback resistor 5 is arranged between collector and input, a resistor 6, small compared with resistor 5, is connected in the base lead. Variations in gain without appreciable lowering of the input impedance are obtained by a slider on potentiometer 5 connected to the base.
GB4922/55A 1954-02-23 1955-02-18 Improvements in or relating to transistor circuits having variable amplification Expired GB765398A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL765398X 1954-02-23

Publications (1)

Publication Number Publication Date
GB765398A true GB765398A (en) 1957-01-09

Family

ID=19827600

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4922/55A Expired GB765398A (en) 1954-02-23 1955-02-18 Improvements in or relating to transistor circuits having variable amplification

Country Status (2)

Country Link
FR (1) FR1119489A (en)
GB (1) GB765398A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7902920B1 (en) 2009-09-10 2011-03-08 Media Tek Singapore Pte. Ltd. Amplifier circuit, integrated circuit and radio frequency communication unit
US7952430B1 (en) 2009-09-10 2011-05-31 Mediatek Singapore Pte. Ltd. Amplifier circuit, integrated circuit and radio frequency communication unit
US8503960B2 (en) 2011-07-29 2013-08-06 Mediatek Singapore Pte. Ltd. Amplifier and associated receiver

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7902920B1 (en) 2009-09-10 2011-03-08 Media Tek Singapore Pte. Ltd. Amplifier circuit, integrated circuit and radio frequency communication unit
WO2011029492A1 (en) * 2009-09-10 2011-03-17 Mediatek Singapore Pte. Ltd. Amplifier circuit, integrated circuit and radio frequency communication unit
US7952430B1 (en) 2009-09-10 2011-05-31 Mediatek Singapore Pte. Ltd. Amplifier circuit, integrated circuit and radio frequency communication unit
US8503960B2 (en) 2011-07-29 2013-08-06 Mediatek Singapore Pte. Ltd. Amplifier and associated receiver

Also Published As

Publication number Publication date
FR1119489A (en) 1956-06-20

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