A 2.4GHz to 6GHz active balun in GaN technology

This article presents a S-C band active balun in a GaN integrated technology. Based on a differential pair this circuit realizes the single to differential conversion. Moreover this circuit can be used as preamplifier to drive a power stage. It delivers more than 25dBm in each differential path in the [2,4GHz-6GHz] band with a maximum of 29dBm at 3.8GHz. The chip has been realized in the UMS GH25 process, a GaN HEMT technology with a 0.25μm gate length.