Integrated circuit comprising an adaptation and filtering network and corresponding adaptation and filtering process

A method for impedance matching and filtering between an output of a power amplifier and an antenna, the power amplifier configured to provide 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 first section coupled between an output node of the power amplifier and a first intermediate node, the first section comprising first inductor-capacitor arrangements,
• a second section coupled between the first intermediate node and a second intermediate node, the second section comprising second inductor-capacitor arrangements, and
• a third section coupled between the second intermediate node and an input node of the antenna, the third section comprising third inductor-capacitor arrangements;
• determining inductors and capacitors of the first inductor-capacitor arrangements and the second inductor-capacitor arrangements to have an impedance matched to the output of the power amplifier at the fundamental frequency band and resonant frequencies adapted to attenuate harmonic frequency bands of the fundamental frequency band;
• determining inductors and capacitors of the third inductor-capacitor arrangements to have an impedance matched to the output of the power amplifier at the fundamental frequency band;
• and
• determining associated resonant frequencies of each of the first series inductor-capacitor arrangement and the second series inductor-capacitor arrangement to be distributed in different harmonic frequency bands of the fundamental frequency band such that the first series inductor-capacitor arrangement and the second series inductor-capacitor arrangement have equivalent impedances corresponding to the impedances of capacitive elements with the smallest capacitive values and the largest resonant frequencies.

A matching and filtering network, the matching and filtering network coupled between a power amplifier configured to provide a signal in a fundamental frequency band and an antenna, the matching and filtering network comprising:

• a first section coupled between an output node of the power amplifier and a first intermediate node, the first section comprising first inductor-capacitor arrangements,
• a second section coupled between the first intermediate node and a second intermediate node, the second section comprising second inductor-capacitor arrangements,
• wherein each of the first inductor-capacitor arrangements and the second inductor-capacitor arrangements is configured to have an impedance matched to the output of the power amplifier at the fundamental frequency band and resonant frequencies adapted to attenuate the harmonic frequency bands of the fundamental frequency band and to have an equivalent impedance corresponding to an impedance of a capacitive element adapted for the impedance matching in the fundamental frequency band, and
• wherein associated resonant frequencies of each of the first series inductor-capacitor arrangement and the second series inductor-capacitor arrangement are chosen to be distributed in different harmonic frequency bands of the fundamental frequency band such that the first series inductor-capacitor arrangement and the second series inductor-capacitor arrangement with equivalent impedances corresponding to the impedances of the capacitive elements with the smallest capacitive values have the largest resonant frequencies, and
• a third section coupled between the second intermediate node and an input node of the antenna, the third section comprising third inductor-capacitor arrangements are configured to have an impedance matched to the output of the power amplifier at the fundamental frequency band.