Patent ID: 7640002

Claim:
A radio-frequency (RF) amplifier that amplifies a composite RF signal to obtain an amplified composite RF signal, the composite RF signal including a first RF signal and a second RF signal, the RF amplifier comprising: a first amplifying circuit that amplifies the first RF signal, the first amplifying circuit comprising a first amplifying stage that provides a first amplified signal and a second amplifying stage that provides a second amplified signal, the second amplifying stage being arranged after the first amplifying stage; a second amplifying circuit that amplifies the second RF signal, the second amplifying circuit comprising a third amplifying stage that provides a third amplified signal and a fourth amplifying stage that provides a fourth amplified signal, the fourth amplifying stage being arranged after the third amplifying stage; a first summation node that sums up the first amplified signal and the second amplified signal to provide a first amplified RF signal; and a second summation node that sums up the third amplified signal and the fourth amplified signal to provide a second amplified RF signal, the first amplified and second amplified signal forming the amplified composite RF signal.