FR3110306B1 - Audio amplifier output stage with improved linearity, output impedance and thermal stability. - Google Patents

Audio amplifier output stage with improved linearity, output impedance and thermal stability. Download PDF

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Publication number
FR3110306B1
FR3110306B1 FR2004748A FR2004748A FR3110306B1 FR 3110306 B1 FR3110306 B1 FR 3110306B1 FR 2004748 A FR2004748 A FR 2004748A FR 2004748 A FR2004748 A FR 2004748A FR 3110306 B1 FR3110306 B1 FR 3110306B1
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FR
France
Prior art keywords
output
current
transistor
thermal stability
audio amplifier
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.)
Active
Application number
FR2004748A
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French (fr)
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FR3110306A1 (en
Inventor
Stéphane Mourareau
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to FR2004748A priority Critical patent/FR3110306B1/en
Publication of FR3110306A1 publication Critical patent/FR3110306A1/en
Application granted granted Critical
Publication of FR3110306B1 publication Critical patent/FR3110306B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/302—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in bipolar transistor amplifiers
    • 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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers 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
    • H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/121—A transistor in common gate configuration being used in a feedback circuit of an amplifier stage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/126—A diode being coupled in a feedback path of an amplifier stage, e.g. active or passive diode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/444—Diode used as protection means in an amplifier, e.g. as a limiter or as a switch
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/462—Indexing scheme relating to amplifiers the current being sensed
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/498—A resistor being added in the source circuit of a transistor amplifier stage as degenerating element
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/528—Indexing scheme relating to amplifiers the temperature dependence being controlled by referencing to the band gap
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/93—Two or more transistors are coupled in a Darlington composite transistor configuration, all transistors being of the same type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/99—A diode as rectifier being used as a detecting circuit in an amplifying circuit

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

Abstract

Les étages de sortie des amplificateurs audio traditionnels exploitent des transistors dont la stabilité du courant de repos est assurée par des résistances entre émetteurs et sortie. Cela pénalise linéarité et impédance de sortie. Le dispositif selon la présente invention remédie à ces inconvénients par un transistor de sortie (CFP) dont l’émetteur est directement relié à la sortie, transistor dont le courant de collecteur est régulé via un capteur de courant (CCA) et une source de courant (CSO) pilotée par un contrôleur de courant (CCO) assurant un courant de repos dans le transistor de sortie indépendant du courant de sortie ainsi qu’un courant faible de veille dans la source de courant. Ainsi la tension de sortie reste contrôlée par l’émetteur d’un même transistor qui ne se bloque jamais cependant que le courant de sortie est produit alternativement par la source de courant et par le transistor de sortie. Figure pour l’abrégé : Fig. 2The output stages of traditional audio amplifiers use transistors whose stability of the quiescent current is ensured by resistors between emitters and output. This penalizes linearity and output impedance. The device according to the present invention overcomes these drawbacks by an output transistor (CFP) whose emitter is directly connected to the output, transistor whose collector current is regulated via a current sensor (CCA) and a current source (CSO) driven by a current controller (CCO) ensuring a quiescent current in the output transistor independent of the output current as well as a low standby current in the current source. Thus the output voltage remains controlled by the emitter of the same transistor which never blocks while the output current is produced alternately by the current source and by the output transistor. Figure for abstract: Fig. 2

FR2004748A 2020-05-14 2020-05-14 Audio amplifier output stage with improved linearity, output impedance and thermal stability. Active FR3110306B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR2004748A FR3110306B1 (en) 2020-05-14 2020-05-14 Audio amplifier output stage with improved linearity, output impedance and thermal stability.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2004748A FR3110306B1 (en) 2020-05-14 2020-05-14 Audio amplifier output stage with improved linearity, output impedance and thermal stability.
FR2004748 2020-05-14

Publications (2)

Publication Number Publication Date
FR3110306A1 FR3110306A1 (en) 2021-11-19
FR3110306B1 true FR3110306B1 (en) 2022-06-03

Family

ID=71894979

Family Applications (1)

Application Number Title Priority Date Filing Date
FR2004748A Active FR3110306B1 (en) 2020-05-14 2020-05-14 Audio amplifier output stage with improved linearity, output impedance and thermal stability.

Country Status (1)

Country Link
FR (1) FR3110306B1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5365199A (en) * 1993-08-02 1994-11-15 Motorola, Inc. Amplifier with feedback having high power supply rejection
US7151410B2 (en) * 2003-12-17 2006-12-19 Agere Systems Inc. Class AB enhanced transconductance source follower
TWI266166B (en) * 2004-12-16 2006-11-11 Realtek Semiconductor Corp Source follower and stabilizing current feedback circuit thereof

Also Published As

Publication number Publication date
FR3110306A1 (en) 2021-11-19

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