Circuit arrangement for an integrated output amplifier

H - Electricity – 03 – F

Patent

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Details

H03F 3/45 (2006.01) H03F 1/32 (2006.01) H04R 25/00 (2006.01)

Patent

CA 2144420

The invention relates to a circuit arrangement for an integrated output amplifier (1) with two constant current sources (2, 3), a voltage amplifier with two inputs (5, 6) and two outputs (7, 8) and two output transistors (Q1, Q2) coupled with these, as well as two feedback networks (9, 10) producing negative feedback which are connectedbetween the output transistors and the corresponding input transistors of the voltage amplifier (4). The first two feedback networks (9, 10) are connected between thecollectors of the output transistors (Q1, Q2) and the base electrodes of the corresponding input transistors of the voltage amplifier (4). In addition, a third feedback network (11) is connected on the input side to the base electrodes of the output transistors and on the output side to the input of a current splitting network (16) via a transistor (Q3) acting as a current sink, whereby said current splitting network has a signal input (17). The current splitting network (16) has two parallel branches (18, 19), between which the current flowing through this network can besplit, whereby this is controlled by the signal present at the signal input (17), and whereby the branches (18 and 19) of the current splitting network (16) are connected on the one hand with the constant current sources (2 and 3) and on the other hand with the inputs of the voltage amplifier (4).

L'invention est un circuit pour un amplificateur intégré (1) qui comprend deux sources de courant constant (2, 3), un amplificateur de tension ayant deux entrées (5, 6) et deux sorties (7, 8) et deux transistors de sortie (Q1, Q2) couplés à ces dernières, ainsi que deux réseaux de réaction négative (9, 10) connectés entre les transistors de sortie et les transistors d'entrée correspondants de l'amplificateur de tension (4). Les deux premiers réseaux de réaction (9, 10) sont connectés entre les connecteurs des transistors de sortie (Q1, Q2) et les bases des transistors d'entrée correspondants de l'amplificateur de tension (4). Par ailleurs, l'entrée d'un troisième réseau de réaction (11) est connectée aux bases des transistors de sortie, alors que la sortie de ce réseau est connectée à l'entrée d'un réseau diviseur de courant (16) via un transistor (Q3) servant de puits de courant. Ce réseau diviseur de courant comporte une entrée de signaux (17) ainsi que deux branchements parallèles (18, 19) entre lesquels le courant interne est réparti; cette répartition est contrôlée par le signal présent à l'entrée (17) et les branchements (18, 19) du réseau diviseur de courant (16) sont connectés aux sources de courant constant (2, 3) d'une part et aux entrées d'un amplificateur de tension (4) d'autre part.

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