Amplifier circuits

An amplifier circuit, comprising:

• a first transistor having a control terminal and first and second controlled terminals, and a second transistor having a control terminal and first and second controlled terminals, where
• the first controlled terminal of the first transistor and the first controlled terminal of the second transistor are connected to one another and to a first reference potential, and
• the second controlled terminal of the first transistor and the second controlled terminal of the second transistor are connected to a second reference potential,
• wherein the first transistor and the second transistor are of a first conductivity type;
• a third transistor having a control terminal and first and second controlled terminals,
• the first controlled terminal of the third transistor is connected to the second controlled terminal of the first transistor;
• the control terminal of the third transistor is set up to receive a voltage which depends on a first input voltage which is applied to the control terminal of the first transistor;
• the second controlled terminal of the third transistor is configured to provide a first output current;
• and
• a fourth transistor having a control terminal and first and second controlled terminals,
• the first controlled terminal of the fourth transistor is connected to the second controlled terminal of the second transistor;
• the control terminal of the fourth transistor is set up to receive a voltage which depends on a second input voltage which is applied to the control terminal of the second transistor;
• and
• the second controlled terminal of the fourth transistor is configured to provide a second output current;
• and
• wherein the third transistor and the fourth transistor are of a second conductivity type which is different from the first conductivity type.

An amplifier circuit, comprising:

• a pair of input differential transistors;
• and
• at least one pair of folded-cascode transistors having a conductivity type that differs from a conductivity type of the input differential transistors;
• wherein each controlled terminal of a transistor of the pair of input differential transistors is connected to a controlled terminal of an associated transistor of the pair of folded-cascode transistors;
• and
• wherein each control terminal of a transistor of the pair of folded-cascode transistors is set up to receive a voltage which depends on a respective input voltage which is applied to a control terminal of an associated transistor of the pair of input differential transistors.

An amplifier circuit, comprising:

• a first transistor having a control terminal and first and second controlled terminals, and a second transistor having a control terminal and first and second controlled terminals, where
• the first controlled terminal of the first transistor and the first controlled terminal of the second transistor are connected to one another and to a first reference potential,
• a first circuit having an input side connected to the second controlled terminal of the first transistor, the first circuit controlled by a first voltage which depends on a first input voltage which is applied to the control terminal of the first transistor, the first circuit having an output side configured to provide a first output current;
• and
• a second circuit having an input side connected to the second controlled terminal of the second transistor, the second circuit controlled by a second voltage which depends on a second input voltage which is applied to a control terminal of the second transistor, the second circuit having an output side configured to provide a second output current;
• wherein the first voltage is independent of the second voltage.