GB717961A - Improvements in and relating to wide-band amplifiers using semi-conductor crystals - Google Patents

Improvements in and relating to wide-band amplifiers using semi-conductor crystals

Info

Publication number
GB717961A
GB717961A GB7010/50A GB701050A GB717961A GB 717961 A GB717961 A GB 717961A GB 7010/50 A GB7010/50 A GB 7010/50A GB 701050 A GB701050 A GB 701050A GB 717961 A GB717961 A GB 717961A
Authority
GB
United Kingdom
Prior art keywords
stage
semi
electrode
acceptor
conductor
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
GB7010/50A
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 des Freins et Signaux Westinghouse SA
Original Assignee
Compagnie des Freins et Signaux Westinghouse 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 des Freins et Signaux Westinghouse SA filed Critical Compagnie des Freins et Signaux Westinghouse SA
Publication of GB717961A publication Critical patent/GB717961A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/34—DC amplifiers in which all stages are DC-coupled
    • H03F3/343—DC amplifiers in which all stages are DC-coupled with semiconductor devices only
    • 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
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
    • H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only

Landscapes

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

Abstract

717,961. Semi-conductor amplifying circuits ; radio receiving apparatus. COMPAGNIE DES FREINS ET SIGNAUX WESTINGHOUSE. March 21, 1950 [April 7, 1949], No. 7010/50. Classes 40 (5) and 40 (6) Each stage of a multi-stage amplifier employs a semi-conductor device having base, control and acceptor electrodes, and the acceptor electrode of one stage is directly connected to the control electrode of the next stage. Fig. 1 shows an amplifier arrangement which is stated to be adapted for use as a radio receiver. Each stage comprises a semi-conductor amplifier Sc and signals from aerial A are detected and amplified in the first stage and then further amplified in the two following stages. Each amplifier device may be of the type described in Specification 697,164, [Group XXXIX], and comprises a point control electrode 1c, a point acceptor electrode 1a, and a base electrode connected to points f. A battery S is connected to a potentiometer R and the first two acceptor electrodes are connected directly to their next control electrode and, also through resistances Ra, to tappings on potentiometer R. The last acceptor electrode supplies the output to loudspeaker HP. The base electrodes, except for the first stage, are connected to tappings on the resistances Ra thereby providing bias for the control electrode. Condensers C are provided to complete the signal ouput circuits of each stage. Condensers C<SP>1</SP> may be provided between the base electrodes and the potentiometer tappings which, it is stated, reduces the damping effect of the low input impedance of each stage. Germanium or silicon may be used as semi-conductor material for the amplifying devices, or a "composite" crystal may be used.
GB7010/50A 1949-04-07 1950-03-21 Improvements in and relating to wide-band amplifiers using semi-conductor crystals Expired GB717961A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1011863T 1949-04-07

Publications (1)

Publication Number Publication Date
GB717961A true GB717961A (en) 1954-11-03

Family

ID=9570302

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7010/50A Expired GB717961A (en) 1949-04-07 1950-03-21 Improvements in and relating to wide-band amplifiers using semi-conductor crystals

Country Status (4)

Country Link
BE (1) BE494593A (en)
CH (1) CH286259A (en)
FR (1) FR1011863A (en)
GB (1) GB717961A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999984A (en) * 1956-02-13 1961-09-12 Honeywell Regulator Co Series-energized cascaded transistor amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999984A (en) * 1956-02-13 1961-09-12 Honeywell Regulator Co Series-energized cascaded transistor amplifier

Also Published As

Publication number Publication date
CH286259A (en) 1952-10-15
BE494593A (en)
FR1011863A (en) 1952-07-01

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