Patent ID: 7949313

Claim:
A conversion device for converting baseband analog I/Q input signals into radio frequency signals in a transmitting path of a wireless communication equipment, comprising: first and second processing paths each comprising an input node adapted to receive a first or second part of said input signals, an input path connected to said input node and arranged to deliver an input current representative of said first or second part of the input signals, an amplifier comprising a first input fed with said input current and a second input fed with a common-mode current and arranged to output an amplified signal, and a transconductor arranged to deliver first and second currents from said amplified signal, said first current feeding a negative feedback path connected to the first input of said amplifier and being essentially equal to said input current, and said second current being a chosen scaled copy of said first current and representative of a voltage difference between said first and second parts of said input signals; a common-mode input path connected to the input nodes of said first and second processing paths and arranged to deliver said common-mode current from said first and second parts of said input signals to feed said second input of each amplifier; and a switch core arranged to mix the second current delivered by a chosen one of said transconductors with a local oscillator carrier at a chosen radio frequency to deliver first or second output RF signals representative of said input signals.