Radio transmitting/receiving device

A module configuring method suitable for a radio transmitting/receiving device, comprising the steps of:

• dividing components for the radio transmitting/receiving device into parts to be mounted on first, second and third modules, and parts other than the parts, to be directly mounted on a motherboard;
• respectively providing for the first, second and third modules, interposer substrates wherein terminals of semiconductor parts mounted on the main surface sides thereof, and external terminals disposed on the back sides thereof are respectively pitch-converted and thereby connected to one another;
• mounting on the first module, parts related to a function for amplifying a received radio frequency signal, demodulating the amplified radio frequency signal to a baseband signal and outputting the same, and a function for modulating the input baseband signal, converting the modulated baseband signal to a radio frequency and outputting the same;
• mounting on the second module, parts related to a function for amplifying the input radio frequency to output power;
• mounting on the third module, parts related to a function for controlling respective units according to a baseband signal process and a transmission/reception sequence based on a communication protocol;
• and
• setting respective external terminals pitches of the first, second and third modules so as to be equal to or greater than a unified minimum terminal pitch.