Amplifier, filter, communication apparatus and network node

A low-noise amplifier, comprising:

• a differential amplifier configured as a complementary amplifier, the differential amplifier comprising:
• a first differential circuitry structure including a first part comprising at least one branch of transistors and a second part comprising at least one branch of transistors;
• and
• a second circuitry structure comprising:
• a first non-linear device connected between a signal point of a branch of the first part having a first differential input terminal of the differential amplifier and a common center node of the second circuitry structure;
• and
• a second non-linear device connected between a signal point of a branch of the second part having a second differential input terminal of the differential amplifier and the common center node;
• wherein the first non-linear device comprises a transistor having a control node connected to a first differential output terminal of the differential amplifier, wherein the first differential output terminal provides an inverted output in relation to the first differential input terminal;
• and
• wherein the second non-linear device comprises a transistor having a control node connected to a second differential output terminal of the differential amplifier, wherein the second differential output terminal provides an inverted output in relation to the second differential input terminal;
• and
• wherein the common center node is connected to a control node of one of the transistors of the branch of the first part having one of the differential output terminals, and connected to a control node of one of the transistors of the branch of the second part having the other differential output terminal;
• a feedback network connected between inputs and outputs of the differential amplifier.

A filter, comprising:

• a plurality of differential amplifiers, each of the differential amplifiers comprising:
• a first differential circuitry structure including a first part comprising at least one branch of transistors and a second part comprising at least one branch of transistors;
• and
• a second circuitry structure comprising:
• a first non-linear device connected between a signal point of a branch of the first part having a first differential input terminal of the differential amplifier and a common center node of the second circuitry structure;
• and
• a second non-linear device connected between a signal point of a branch of the second part having a second differential input terminal of the differential amplifier and the common center node;
• wherein the first non-linear device comprises a transistor having a control node connected to a first differential output terminal of the differential amplifier, wherein the first differential output terminal provides an inverted output in relation to the first differential input terminal;
• and
• wherein the second non-linear device comprises a transistor having a control node connected to a second differential output terminal of the differential amplifier, wherein the second differential output terminal provides an inverted output in relation to the second differential input terminal;
• and
• wherein the common center node is connected to a control node of one of the transistors of the branch of the first part having one of the differential output terminals, and connected to a control node of one of the transistors of the branch of the second part having the other differential output terminal.

A power amplifier, comprising:

• a driver stage;
• wherein the driver stage comprises a differential amplifier, the differential amplifier comprising:
• a first differential circuitry structure including a first part comprising at least one branch of transistors and a second part comprising at least one branch of transistors;
• and
• a second circuitry structure comprising:
• a first non-linear device connected between a signal point of a branch of the first part having a first differential input terminal of the differential amplifier and a common center node of the second circuitry structure;
• and
• a second non-linear device connected between a signal point of a branch of the second part having a second differential input terminal of the differential amplifier and the common center node;
• wherein the first non-linear device comprises a transistor having a control node connected to a first differential output terminal of the differential amplifier, wherein the first differential output terminal provides an inverted output in relation to the first differential input terminal;
• and
• wherein the second non-linear device comprises a transistor having a control node connected to a second differential output terminal of the differential amplifier, wherein the second differential output terminal provides an inverted output in relation to the second differential input terminal;
• and
• wherein the common center node is connected to a control node of one of the transistors of the branch of the first part having one of the differential output terminals, and connected to a control node of one of the transistors of the branch of the second part having the other differential output terminal.

A communication apparatus configured to operate in a cellular communication system, the communication apparatus comprising:

• radio circuitry;
• wherein the radio circuitry comprises a differential amplifier, the differential amplifier comprising:
• a first differential circuitry structure including a first part comprising at least one branch of transistors and a second part comprising at least one branch of transistors;
• and
• a second circuitry structure comprising:
• a first non-linear device connected between a signal point of a branch of the first part having a first differential input terminal of the differential amplifier and a common center node of the second circuitry structure;
• and
• a second non-linear device connected between a signal point of a branch of the second part having a second differential input terminal of the differential amplifier and the common center node;
• wherein the first non-linear device comprises a transistor having a control node connected to a first differential output terminal of the differential amplifier, wherein the first differential output terminal provides an inverted output in relation to the first differential input terminal;
• and
• wherein the second non-linear device comprises a transistor having a control node connected to a second differential output terminal of the differential amplifier, wherein the second differential output terminal provides an inverted output in relation to the second differential input terminal;
• and
• wherein the common center node is connected to a control node of one of the transistors of the branch of the first part having one of the differential output terminals, and connected to a control node of one of the transistors of the branch of the second part having the other differential output terminal.

A network node configured to operate in a cellular communication system, the network node comprising:

• radio circuitry;
• wherein the radio circuitry comprises a differential amplifier, the differential amplifier comprising:
• a first differential circuitry structure including a first part comprising at least one branch of transistors and a second part comprising at least one branch of transistors;
• and
• a second circuitry structure comprising:
• a first non-linear device connected between a signal point of a branch of the first part having a first differential input terminal of the differential amplifier and a common center node of the second circuitry structure;
• and
• a second non-linear device connected between a signal point of a branch of the second part having a second differential input terminal of the differential amplifier and the common center node;
• wherein the first non-linear device comprises a transistor having a control node connected to a first differential output terminal of the differential amplifier, wherein the first differential output terminal provides an inverted output in relation to the first differential input terminal;
• and
• wherein the second non-linear device comprises a transistor having a control node connected to a second differential output terminal of the differential amplifier, wherein the second differential output terminal provides an inverted output in relation to the second differential input terminal;
• and
• wherein the common center node is connected to a control node of one of the transistors of the branch of the first part having one of the differential output terminals, and connected to a control node of one of the transistors of the branch of the second part having the other differential output terminal.