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GB1425925A - Emplifiers - Google Patents

Emplifiers

Info

Publication number
GB1425925A
GB1425925A GB2355372A GB2355372A GB1425925A GB 1425925 A GB1425925 A GB 1425925A GB 2355372 A GB2355372 A GB 2355372A GB 2355372 A GB2355372 A GB 2355372A GB 1425925 A GB1425925 A GB 1425925A
Authority
GB
United Kingdom
Prior art keywords
transistors
amplifier
complementary
adjust
parallel
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
GB2355372A
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB2355372A priority Critical patent/GB1425925A/en
Publication of GB1425925A publication Critical patent/GB1425925A/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
    • H03F3/3066—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the collectors of complementary power transistors being connected to the output
    • 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
    • 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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3217—Modifications of amplifiers to reduce non-linear distortion in single ended push-pull amplifiers
    • 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)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Picture Signal Circuits (AREA)
  • Amplifiers (AREA)

Abstract

1425925 Transistor amplifying circuits EMI Ltd 11 May 1973 [19 May 1972] 23553/72 Heading H3T An amplifier which is more particularly intended for use as a linear video amplifier comprises two pairs of transistors Q1, Q2 and Q3, Q4 respectively; each pair comprises two complementary transistors in cascade connection, the input transistors Q1, Q3 being also complementary to each other and having their inputs connected in parallel, while the output transistors Q2, Q4 also comprise a complementary pair with their outputs connected in parallel. The amplifier is driven from a preliminary stage Q5, the base biasing circuit of transistors Q1, Q3 including a variable resistor VR1 being used to adjust the relative currents in the two transistors. Variable resistor VR2 differentialy adjusts the currents in transistors Q2, Q4 while variable capacitor C1 is used to adjust the phase characteristic. The amplifier feeds into an output stage comprising complementary transistors Q7, Q6 in emitter follower connection; feedback round the amplifier is provided by lead 11.
GB2355372A 1972-05-19 1972-05-19 Emplifiers Expired GB1425925A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2355372A GB1425925A (en) 1972-05-19 1972-05-19 Emplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2355372A GB1425925A (en) 1972-05-19 1972-05-19 Emplifiers

Publications (1)

Publication Number Publication Date
GB1425925A true GB1425925A (en) 1976-02-25

Family

ID=10197520

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2355372A Expired GB1425925A (en) 1972-05-19 1972-05-19 Emplifiers

Country Status (1)

Country Link
GB (1) GB1425925A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177433A (en) * 1978-11-20 1979-12-04 International Business Machines Corporation Reel motor preamplifier
US4195267A (en) * 1978-02-01 1980-03-25 Crown International, Inc. Low-level preamplifier circuit
US4284959A (en) * 1979-11-13 1981-08-18 Rca Corporation Folded-cascode amplifier arrangement with cascode load means
US4321553A (en) * 1979-03-21 1982-03-23 Ford Aerospace & Communications Corp. Wide bandwidth low distortion amplifier
GB2121634A (en) * 1982-06-07 1983-12-21 Western Electric Co Improvements in or relating to amplifier circuits

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195267A (en) * 1978-02-01 1980-03-25 Crown International, Inc. Low-level preamplifier circuit
US4177433A (en) * 1978-11-20 1979-12-04 International Business Machines Corporation Reel motor preamplifier
US4321553A (en) * 1979-03-21 1982-03-23 Ford Aerospace & Communications Corp. Wide bandwidth low distortion amplifier
US4284959A (en) * 1979-11-13 1981-08-18 Rca Corporation Folded-cascode amplifier arrangement with cascode load means
GB2121634A (en) * 1982-06-07 1983-12-21 Western Electric Co Improvements in or relating to amplifier circuits

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Legal Events

Date Code Title Description
PS Patent sealed