GB855342A - Improvements in transistor amplifiers - Google Patents

Improvements in transistor amplifiers

Info

Publication number
GB855342A
GB855342A GB2837755A GB2837755A GB855342A GB 855342 A GB855342 A GB 855342A GB 2837755 A GB2837755 A GB 2837755A GB 2837755 A GB2837755 A GB 2837755A GB 855342 A GB855342 A GB 855342A
Authority
GB
United Kingdom
Prior art keywords
rectifier
transistor
circuit
bias
resistor
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
GB2837755A
Inventor
Oswald Barber Sneath
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.)
Multitone Electric Co Ltd
Original Assignee
Multitone 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 Multitone Electric Co Ltd filed Critical Multitone Electric Co Ltd
Priority to GB2837755A priority Critical patent/GB855342A/en
Publication of GB855342A publication Critical patent/GB855342A/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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
    • 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
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Landscapes

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

Abstract

855,342. Transistor amplifier circuits. MULTITONE ELECTRIC CO. Ltd. Jan. 4, 1957 [Oct. 5, 1955], No. 28377/55. Class 40(6). A junction transistor amplifier has a load in the emitter circuit and comprises a bias circuit consisting of a rectifier having one side connected through a capacitor to the emitter and the other side connected to the supply so that an increase mean current flows through the transistor as the signal amplitude increases. In Fig. 1 bias is applied to the base of the transistor from a capacitor and rectifier circuit C, M connected across the load terminals L1, L2, a small standing bias being obtained from a potentiometer R1, R2 to prevent distortion at low signal levels. One of the resistors may be temperature sensitive so as to stabilize the transistor operation. In an alternative circuit (Fig. 2 not shown) the resistor R2 is connected in series with the rectifier, while in Fig. 3 (not shown) a resistor is connected in parallel with the rectifier so that the zero signal current is still small even at high temperatures. The invention may also be applied to push pull amplifiers.
GB2837755A 1955-10-05 1955-10-05 Improvements in transistor amplifiers Expired GB855342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2837755A GB855342A (en) 1955-10-05 1955-10-05 Improvements in transistor amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2837755A GB855342A (en) 1955-10-05 1955-10-05 Improvements in transistor amplifiers

Publications (1)

Publication Number Publication Date
GB855342A true GB855342A (en) 1960-11-30

Family

ID=10274690

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2837755A Expired GB855342A (en) 1955-10-05 1955-10-05 Improvements in transistor amplifiers

Country Status (1)

Country Link
GB (1) GB855342A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128431A (en) * 1982-09-24 1984-04-26 Ates Componenti Elettron Improvements in or relating to audio power amplifiers with automatic adjustment of output stage bias current

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128431A (en) * 1982-09-24 1984-04-26 Ates Componenti Elettron Improvements in or relating to audio power amplifiers with automatic adjustment of output stage bias current

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