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1. WO2001041301 - DIFFERENTIAL AMPLIFIER

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Publication Number WO/2001/041301
Publication Date 07.06.2001
International Application No. PCT/JP2000/008512
International Filing Date 01.12.2000
Chapter 2 Demand Filed 23.03.2001
IPC
H03F 3/30 2006.1
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
30Single-ended push-pull amplifiers; Phase-splitters therefor
H03F 3/45 2006.1
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
45Differential amplifiers
CPC
H03F 2203/45028
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2203Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
45Indexing scheme relating to differential amplifiers
45028the differential amplifier amplifying transistors are folded cascode coupled transistors
H03F 2203/45292
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2203Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
45Indexing scheme relating to differential amplifiers
45292the AAC comprising biasing means controlled by the signal
H03F 2203/45651
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2203Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
45Indexing scheme relating to differential amplifiers
45651the LC comprising two cascode current sources
H03F 3/3028
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
30Single-ended push-pull ; [SEPP]; amplifiers
3001with field-effect transistors
3022CMOS common source output SEPP amplifiers
3028with symmetrical driving of the end stage
H03F 3/45179
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
45Differential amplifiers
45071with semiconductor devices only
45076characterised by the way of implementation of the active amplifying circuit in the differential amplifier
45179using MOSFET transistors as the active amplifying circuit
H03F 3/45192
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
45Differential amplifiers
45071with semiconductor devices only
45076characterised by the way of implementation of the active amplifying circuit in the differential amplifier
45179using MOSFET transistors as the active amplifying circuit
45183Long tailed pairs
45192Folded cascode stages
Applicants
  • YAMAHA CORPORATION [JP]/[JP] (AllExceptUS)
  • MAEJIMA, Toshio [JP]/[JP] (UsOnly)
Inventors
  • MAEJIMA, Toshio
Agents
  • SHIGA, Masatake
Priority Data
11/34394702.12.1999JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) DIFFERENTIAL AMPLIFIER
(FR) AMPLIFICATEUR DIFFERENTIEL
front page image
Abstract
(EN) A differential amplifier circuit comprises an input circuit (10) for generating the difference in voltage between a positive input signal and a negative input signal; a feedback bias circuit (20) for providing a bias voltage corresponding to the differential voltage signal in response to the differential voltage signal supplied by the input circuit (10) and for feeding the output current back to control the bias voltage; an output circuit (30) for supplying load with the output current corresponding to the bias voltage; and a current detector circuit (40) for detecting the output current and supplying it to the feedback bias circuit (20). The differential amplifier circuit performs as a class-AB amplifier with the bias current value being close to zero if the differential voltage signal is zero.
(FR) Cette invention concerne un amplificateur différentiel comprenant :un circuit d'entrée (10) qui génère un écart de tension entre deux signaux d'entrée, l'un positif, l'autre négatif; un circuit de polarisation à rétroaction (20) fournissant une tension de polarisation correspondant au signal de tension différentielle en réponse au signal de tension différentielle fourni par le circuit d'entrée (10) et assurant une rétroaction du courant qui commande la tension de polarisation; un circuit de sortie (30) qui fournit à la charge un courant de sortie correspondant à la tension de polarisation; et un circuit de détection de courant (40) qui détecte le courant de sortie et qui l'envoie au circuit de polarisation à rétroaction (20). Le circuit de l'amplificateur de tension se comporte comme un amplificateur de classe A-B avec un courant de polarisation dont la valeur est proche de zéro si le signal de tension différentielle est nul.
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