3 mm Benefits • Biasing Control Extends Battery Time • Simple Input and Output Matching • Only One Single Supply Required • No High-side Switching Transistor Required 1. Description 1.1 Process This 5-GHz power amplifier (PA) is designed using Atmel’s Silicon-Germanium (SiGe) process and provides high efficiency. 1.2 Circuitry The PA, ATR7040, consists of a three-stage amplifier with a typical output power of 25 dBm. The output stage was implemented using an open-collector structure. Power up, p