Integrated circuit comprising an adaptation and filtering network including a direct current power supply stage, and corresponding adaptation and filtering process

A method for impedance matching and filtering between an antenna and an output of a power amplifier providing a signal in a fundamental frequency band, the method comprising:

• coupling a matching and filtering network between the power amplifier and the antenna, the matching and filtering network comprising:
• a direct current power supply stage coupled between a supply voltage node and an output node of the power amplifier,
• a first section coupled between the output node of the power amplifier and an intermediate node, and
• a second section coupled between the intermediate node and an input node of the antenna, each of the direct current power supply stage, the first section, and the second section comprising inductor-capacitor (LC) arrangements, wherein the LC arrangements of the second section comprises an LC arrangement and one of an inductive element or a capacitive element;
• determining the LC arrangements of each of the direct current power supply stage, the first section, and the second section to have an impedance matched to the output of the power amplifier at the fundamental frequency band;
• determining the LC arrangements of the direct current power supply stage and of the first section to have resonant frequencies adapted to attenuate harmonic frequency bands of the fundamental frequency band;
• determining the LC arrangements of the second section to have a resonant frequency adapted to attenuate a harmonic frequency band of the fundamental frequency band;
• and
• determining the inductive element or capacitive element to not introduce resonance positioned within a harmonic frequency band of the fundamental frequency band.

A matching and filtering network circuit, the matching and filtering network circuit coupled between an antenna and an output of a power amplifier configured to provide a signal in a fundamental frequency band;

• the matching and filtering network circuit comprising:
• a direct current power supply stage coupled between a supply voltage node and an output node of the power amplifier,
• a first section coupled between the output node of the power amplifier and an intermediate node, and
• a second section coupled between the intermediate node and an input node of the antenna, each of the direct current power supply stage, the first section, and the second section comprising inductor-capacitor (LC) arrangements configured to have an impedance matched to the output of the power amplifier at the fundamental frequency band, and the LC arrangements of the direct current power supply stage and of the first section configured to have resonant frequencies adapted to attenuate harmonic frequency bands of the fundamental frequency band
• wherein the second section is configured to have a resonant frequency greater than the resonant frequency of the series LC arrangement of the first section.