ES279238A1 - Improvements in amplifier circuits - Google Patents

Improvements in amplifier circuits

Info

Publication number
ES279238A1
ES279238A1 ES0279238A ES279238A ES279238A1 ES 279238 A1 ES279238 A1 ES 279238A1 ES 0279238 A ES0279238 A ES 0279238A ES 279238 A ES279238 A ES 279238A ES 279238 A1 ES279238 A1 ES 279238A1
Authority
ES
Spain
Prior art keywords
transistor
amplifier circuits
value
bandwidth
gain
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
ES0279238A
Other languages
Spanish (es)
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of ES279238A1 publication Critical patent/ES279238A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

Improvements in amplifier circuits, which refer, more particularly, to the gain control procedures of the large-bandwidth transistor amplifiers, characterized in that the value of the gain of each step is modified by simultaneous variation of the emitter voltage. collector and the intensity of the emitter current of the corresponding transistor, these variations being made in such directions that the input and output impedances of said transistor remain substantially constant, allowing such an arrangement to avoid any modification of the passing bandwidth of each step and the value of the central frequency corresponding to said band. (Machine-translation by Google Translate, not legally binding)
ES0279238A 1961-07-21 1962-07-14 Improvements in amplifier circuits Expired ES279238A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR868631A FR1302631A (en) 1961-07-21 1961-07-21 Improvements to amplifier circuits

Publications (1)

Publication Number Publication Date
ES279238A1 true ES279238A1 (en) 1963-01-01

Family

ID=8759786

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0279238A Expired ES279238A1 (en) 1961-07-21 1962-07-14 Improvements in amplifier circuits

Country Status (5)

Country Link
DE (1) DE1154519B (en)
ES (1) ES279238A1 (en)
FR (1) FR1302631A (en)
GB (1) GB974065A (en)
OA (1) OA00183A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1295618B (en) * 1963-04-27 1969-05-22 Philips Patentverwaltung Circuit arrangement for controlling the amplification of series-connected transistor amplifier stages in a television receiver
DE1299331B (en) * 1966-01-10 1969-07-17 Siemens Ag Transistor amplifier with adjustable amplification factor and with a constant transmission curve over the entire control range
DE3276515D1 (en) * 1982-06-22 1987-07-09 Telefongyar Frequency selective amplifier with gain control

Also Published As

Publication number Publication date
DE1154519B (en) 1963-09-19
GB974065A (en) 1964-11-04
OA00183A (en) 1966-03-15
FR1302631A (en) 1962-08-31

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