An integrated circuit (10, 10a-d) is disclosed, which is configured to be connected to an antenna module (3) having multiple antenna elements (17). The integrated circuit (10, 10a-d) comprises a plurality of communications circuits (50j), each of which is configured to be connected to an antenna element (17) of the antenna module (3). It also comprises a first clock input terminal (551) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a first clock-distribution network (601) connected between the first clock input terminal (551) and a first subset (651) of the communication circuits (50j). Furthermore, it comprises a second clock input terminal (552) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a second clock-distribution network (601) connected between the second clock input terminal (552) and a second subset (652) of the communication circuits (50j).