A monolithic, compact balun/matching network for SiP applications

We describe a circuit and design method for a compact balun/matching network suitable for a variety of RF application using thin-film integrated passive device (IPD) technology. The circuit uses resonant coupled inductors. By appropriate tuning of the capacitors in the circuit, the balun can be made to match a wide range of impedances. Measured results of example circuits for 802.11 b/g or Bluetooth applications (2.4-2.5 GHz) are presented, showing excellent agreement with simulation.