WO2000025420A3 - A video output amplifier - Google Patents

A video output amplifier Download PDF

Info

Publication number
WO2000025420A3
WO2000025420A3 PCT/DK1999/000579 DK9900579W WO0025420A3 WO 2000025420 A3 WO2000025420 A3 WO 2000025420A3 DK 9900579 W DK9900579 W DK 9900579W WO 0025420 A3 WO0025420 A3 WO 0025420A3
Authority
WO
WIPO (PCT)
Prior art keywords
quiescent
power consumption
amplifiers
current
video output
Prior art date
Application number
PCT/DK1999/000579
Other languages
Danish (da)
French (fr)
Other versions
WO2000025420A2 (en
Inventor
Erik Albert Jensen
Original Assignee
Bang & Olufsen As
Erik Albert Jensen
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 Bang & Olufsen As, Erik Albert Jensen filed Critical Bang & Olufsen As
Priority to AU63263/99A priority Critical patent/AU6326399A/en
Priority to EP99950509A priority patent/EP1125360A2/en
Publication of WO2000025420A2 publication Critical patent/WO2000025420A2/en
Publication of WO2000025420A3 publication Critical patent/WO2000025420A3/en

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
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/148—Video amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/648—Video amplifiers

Abstract

Output amplifiers for driving picture tubes need to provide a high slew rate, and traditional class-A amplifiers have a high quiescent power consumption because of the high supply voltage combined with the necessary high quiescent current. According to the invention, the quiescent current is constituted mainly of the DC feedback current in the output device (TR3), and its control electrode is driven by means of a transistor (TR1), whose base has a reference potential, and whose emitter receives the static component of the control signal for the picture tube. In one embodiment the quiescent power consumption is 10-15 % of that of a corresponding class-A amplifier, and the required cooling means may be considerably reduced.
PCT/DK1999/000579 1998-10-23 1999-10-22 A video output amplifier WO2000025420A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU63263/99A AU6326399A (en) 1998-10-23 1999-10-22 A video output amplifier
EP99950509A EP1125360A2 (en) 1998-10-23 1999-10-22 A video output amplifier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA199801371 1998-10-23
DKPA199801371 1998-10-23

Publications (2)

Publication Number Publication Date
WO2000025420A2 WO2000025420A2 (en) 2000-05-04
WO2000025420A3 true WO2000025420A3 (en) 2000-07-27

Family

ID=8104128

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1999/000579 WO2000025420A2 (en) 1998-10-23 1999-10-22 A video output amplifier

Country Status (3)

Country Link
EP (1) EP1125360A2 (en)
AU (1) AU6326399A (en)
WO (1) WO2000025420A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1454411B1 (en) * 2001-11-22 2005-08-24 Koninklijke Philips Electronics N.V. Image display apparatus and high voltage driver circuit
DE60234749D1 (en) 2002-04-12 2010-01-28 St Microelectronics Ltd Class AB output stage for an amplifier with an output voltage range corresponding to the supply voltage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097815A (en) * 1975-04-09 1978-06-27 Indesit Industria Elettrodomestici Italiana S.P.A. Amplifying circuit
US4114109A (en) * 1975-04-09 1978-09-12 Indesit Industria Elettrodomestici Italiana S.P.A. Amplifying circuit
US4293875A (en) * 1980-01-03 1981-10-06 Telegram Communications Corp. Wide bandwidth video amplifier
US5546048A (en) * 1992-09-04 1996-08-13 Hitachi, Ltd. Amplifier and display apparatus employing the same
US5661436A (en) * 1996-04-19 1997-08-26 Eastman Kodak Company High bandwidth video output amplifier circuit for high resolution cathode ray tube image displays

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097815A (en) * 1975-04-09 1978-06-27 Indesit Industria Elettrodomestici Italiana S.P.A. Amplifying circuit
US4114109A (en) * 1975-04-09 1978-09-12 Indesit Industria Elettrodomestici Italiana S.P.A. Amplifying circuit
US4293875A (en) * 1980-01-03 1981-10-06 Telegram Communications Corp. Wide bandwidth video amplifier
US5546048A (en) * 1992-09-04 1996-08-13 Hitachi, Ltd. Amplifier and display apparatus employing the same
US5661436A (en) * 1996-04-19 1997-08-26 Eastman Kodak Company High bandwidth video output amplifier circuit for high resolution cathode ray tube image displays

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Schaltungen zur Ansteuerung der Farbbildröhre", FUNKSCHAU, PART I, no. 21, 1987, pages 60, XP002900931 *
"Schaltungen zur Ansteuerung der Farbbildröhre", FUNKSCHAU, PART II, no. 22, 1987, pages 83 - 86, XP002900932 *
"Schaltungen zur Ansteuerung der Farbbildröhre", FUNKSCHAU, PART III, no. 23, 1987, pages 53 - 56, XP002900933 *

Also Published As

Publication number Publication date
WO2000025420A2 (en) 2000-05-04
AU6326399A (en) 2000-05-15
EP1125360A2 (en) 2001-08-22

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