GB1313152A - Class b amplifiers - Google Patents

Class b amplifiers

Info

Publication number
GB1313152A
GB1313152A GB1313152DA GB1313152A GB 1313152 A GB1313152 A GB 1313152A GB 1313152D A GB1313152D A GB 1313152DA GB 1313152 A GB1313152 A GB 1313152A
Authority
GB
United Kingdom
Prior art keywords
transistor
boot
diode
driver transistor
collector
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
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 Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Publication of GB1313152A publication Critical patent/GB1313152A/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
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3069—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output
    • H03F3/3071—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output with asymmetrical driving of the end stage
    • 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
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3066—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the collectors of complementary power transistors being connected to the output
    • H03F3/3067—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the collectors of complementary power transistors being connected to the output with asymmetrical driving of the end stage

Landscapes

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

Abstract

1313152 Transistor Class B amplifiers MULLARD Ltd 20 July 1970 34974/70 Heading H3T In a Class B amplifier having a driver transistor TR1 and complementary transistor output devices TR2, TR3 serially connected between a direct current supply, a first boot-strap circuit R1, R2, C1, TR2 is connected to the collector of the driver transistor TR1 and through a diode D3 to a second boot-strap circuit R6, R7, C2, TR3 so that if the collector current of the driver transistor TR1 rises above a predetermined level the diode D3 is cut-off to isolate the collector of TR1 from the second boot-strap circuit. The diode D3 protects the driver transistor TR1 from excessive current flow and diodes D1 and D2 protect the output transistors TR2, TR3. The load RL may be a loud-speaker and instead of the load being connected to the centre point of the supply it may be connected to one side of the supply through a capacitor. A voltage level setting arrangement X may be a series chain of diodes or a transistor (TR4, Fig. 3, not shown) and the output transistors TR2 and TR3 may each be replaced by a pair of transistors (TR5, TR6 and TR7, TR8).
GB1313152D 1970-07-20 1970-07-20 Class b amplifiers Expired GB1313152A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3497470 1970-07-20

Publications (1)

Publication Number Publication Date
GB1313152A true GB1313152A (en) 1973-04-11

Family

ID=10372305

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1313152D Expired GB1313152A (en) 1970-07-20 1970-07-20 Class b amplifiers

Country Status (1)

Country Link
GB (1) GB1313152A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151080A2 (en) * 1984-02-02 1985-08-07 Thomson-Csf Level transposition circuit for high definition video image generation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151080A2 (en) * 1984-02-02 1985-08-07 Thomson-Csf Level transposition circuit for high definition video image generation
FR2559328A1 (en) * 1984-02-02 1985-08-09 Thomson Csf USER-LEVEL TRANSPOSITION CIRCUIT FOR HIGH-DEFINITION VIDEO IMAGING
EP0151080A3 (en) * 1984-02-02 1985-08-21 Thomson-Csf Level transposition circuit for high definition video image generation

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees