The LX5503E is a power amplifier optimized for high-efficiency low power applications in the FCC Unlicensed National Information Infrastructure (U-NII) band, Europe HyperLAN2, and Japan WLAN in the 4.9-5.85GHz frequency range. The PA is implemented as a two-stage monolithic microwave integrated circuit (MMIC) with active bias and input/output pre-matching. The device is manufactured with an InGaP/GaAs Heterojunction Bipolar Transistor (HBT) IC process (MOCVD). It operates at a single supply of 3.3V with +26dBm of P1dB, and power gain of 21dB between 4.9-5.35GHz and 16dB up to 5.85GHz.