US 2006/0125522 A1Published application

Output stage, amplifier control loop and use of the output stage

AssigneeInfineon Technologies AG

InventorsErwin Krug, Horst Klein

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Abstract

An output stage includes a first transistor pair with a first conductivity type and a second transistor pair with a second conductivity type. The source connections of the first and second transistors in the first transistor pair and of the first and second transistors in the second transistor pair are respectively connected to a first and a second circuit node. The output stage further includes a first current mirror with the first conductivity type and a second current mirror with the second conductivity type. The current mirror transistors are connected to the signal output. The signal input is connected to control connections of the first transistors in the first and second transistor pairs. A second connection of the second transistor in the first transistor pair is connected to the second current mirror, and a second connection of the second transistor in the second transistor pair is connected to the first current mirror.

Claims19

Dependent claims

An output stage, comprising:

a signal input, an actuating input, and a signal output;
a first transistor pair with a first conductivity type, where a respective first connection of a first transistor and of a second transistor in the first transistor pair is connected to a first circuit node;
a first current source connected to the first circuit node;
a second transistor pair with a second conductivity type, where a respective first connection of a first transistor and of a second transistor in the second transistor pair is connected to a second circuit node;
a second current source connected to the second circuit node;
a first current mirror with a current mirror transistor of the first conductivity type connected to the signal output;
and
a second current mirror with a current mirror transistor of the second conductivity type connected to the signal output,
wherein the signal input is connected to control connections of the first transistors in the first and second transistor pairs, the actuating input is connected to control connections of the second transistors in the first and second transistor pairs, a second connection of the second transistor in the first transistor pair is connected to the second current mirror, and a second connection of the second transistor in the second transistor pair is connected to the first current mirror.

6 more elements

An output stage, comprising:

first and second differential amplifier circuits each coupled between a signal input and an actuating input, wherein each of the first and second differential amplifier circuits comprise asymmetric transistor pairs, wherein an output current in one transistor of each transistor pair is less than a current in the other transistor of the respective transistor pair;
and
first and second current mirror circuits coupled to the second and first differential amplifier circuits, respectively, wherein each of the first and second current mirror circuits comprise asymmetric transistor pairs, wherein a first current mirror transistor of each current mirror circuit is coupled to the output current transistor of the respective differential amplifier circuit, and wherein a second current mirror transistor of each current mirror circuit is coupled together to form a signal output, and further wherein a current in each second current mirror transistor is greater than a current in the respective first current mirror transistor.

Dependencies are inferred from the claim text.