The SGA5389Z is a high performance SiGe HBT MMIC amplifier. A Darlington configuration featuring one-micron emitters provides high F T and excellent thermal performance. The heterojunction increases breakdown voltage and minimizes leakage current between junctions. Cancellation of emitter junction non-linearities results in higher suppression of intermodulation products. Only two DC-blocking capacitors, a bias resistor, and an optional RF choke are required for operation.