A conversion device (CD) is dedicated to conversion of baseband analog I/Q input signals into RF signals in a transmitting path of a wireless communication equipment. This device (CD) comprises i) first (PP1) and second (PP2) processing paths each comprising i1) an input node (IN1, IN2) receiving an input signal (I/Q), i2) an input path (IP1, IP2) connected to the input node and delivering an input current representative of the input signal (I/Q), i3) an amplification means (A1, A2) having first and second inputs fed with the input current and a common-mode current and outputting an amplified signal, and i4) a transconductor (T1, T2) delivering first and second currents from the amplified signal, the first current feeding a negative feedback path connected to the first input of the amplification means and being essentially equal to the input current, and the second current being a chosen scaled copy of the first current and representative of a voltage difference between the input signals (I/Q), H) a common-mode input path (CIP) connected to the input nodes (IN1, IN2) and delivering the common-mode current from the input signals (I/Q) to feed the second input of each amplification means (A1, A2), and iii) a switch core (SC) for mixing the second current delivered by a chosen one of the transconductors (T1, T2) with a local oscillator RF carrier to deliver output RF signals representative of the input signals (I/Q).