GB909776A - A transistor amplifier with gain control - Google Patents

A transistor amplifier with gain control

Info

Publication number
GB909776A
GB909776A GB3074761A GB3074761A GB909776A GB 909776 A GB909776 A GB 909776A GB 3074761 A GB3074761 A GB 3074761A GB 3074761 A GB3074761 A GB 3074761A GB 909776 A GB909776 A GB 909776A
Authority
GB
United Kingdom
Prior art keywords
transistor
gain control
amplifier
circuit
aug
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
GB3074761A
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.)
NEC Corp
Original Assignee
Nippon Electric Co 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 Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Publication of GB909776A publication Critical patent/GB909776A/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
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H03F1/22—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively

Landscapes

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

Abstract

909,776. Transistor amplifying circuits. NIPPON ELECTRIC CO. Ltd. Aug. 25, 1961 [Aug. 30, 1960], No. 30747/61. Class 40 (6). In a transistor amplifier wherein gain control is effected by varying the D.C. operating level, a first transistor 1, with a grounded emitter is directly connected to a second transistor 2, connected in a grounded base circuit. This arrangement is such that the input and output impedances of the amplifier remain substantially constant irrespective of variations of the emitter current of transistor 2. Gain control is effected from terminal 5 via diode 3 which is connected in parallel with the input to transistor 2 so as to control its emitter current. The diode may be replaced by a non-linear resistor and the gain control circuit may include a current measuring instrument A. The circuit is such that the bandwidth characteristics of the amplifier are not affected by variation of the D.C. operating level.
GB3074761A 1960-08-30 1961-08-25 A transistor amplifier with gain control Expired GB909776A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3659160 1960-08-30

Publications (1)

Publication Number Publication Date
GB909776A true GB909776A (en) 1962-11-07

Family

ID=12474005

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3074761A Expired GB909776A (en) 1960-08-30 1961-08-25 A transistor amplifier with gain control

Country Status (1)

Country Link
GB (1) GB909776A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447091A (en) * 1966-01-17 1969-05-27 Marconi Co Ltd Variable gain wide band bandpass amplifier
US3461394A (en) * 1964-07-28 1969-08-12 Siemens Ag Multistage wide-band transistor amplifier
WO1989001262A2 (en) * 1987-07-29 1989-02-09 Fujitsu Limited High-speed electronic circuit having a cascode configuration
US5510745A (en) * 1987-07-29 1996-04-23 Fujitsu Limited High-speed electronic circuit having a cascode configuration

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461394A (en) * 1964-07-28 1969-08-12 Siemens Ag Multistage wide-band transistor amplifier
US3447091A (en) * 1966-01-17 1969-05-27 Marconi Co Ltd Variable gain wide band bandpass amplifier
WO1989001262A2 (en) * 1987-07-29 1989-02-09 Fujitsu Limited High-speed electronic circuit having a cascode configuration
WO1989001262A3 (en) * 1987-07-29 1989-02-23 Fujitsu Ltd High-speed electronic circuit having a cascode configuration
US5510745A (en) * 1987-07-29 1996-04-23 Fujitsu Limited High-speed electronic circuit having a cascode configuration

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