The HMC554ACHIPS is a general-purpose, double-balanced mixer that can be used as an upconverter or a downconverter between 10 GHz and 20 GHz. This mixer is fabricated in a gallium arsenide (GaAs), metal semiconductor field effect transistor (MESFET) process and requires no external components or matching circuitry. The HMC554ACHIPS optimized balun structures provide high local oscillator (LO) to RF isolation and LO to intermediate frequency (IF) isolation, 38 dB and 52 dB, respectively.