0.5 µm GaAs PHEMT medium power amplifier design using simple RC feedback amplifier for wireless LAN applications

In this paper, a medium power amplifier (MPA) designed using 0.5mum GaAs PHEMT technology targeted for a wireless LAN application is presented. The MPA is a two-stage single-ended design which employs a simple RC feedback amplifier. Feedback is an important concept in circuit design, where a signal or voltage derived from the output is superimposed on the input. This output-to-input path can be used for several purposes such as to control output voltage, control gain, reduce distortion, improve stability, or create instability, as in an oscillator. The RC feedback that was used in this MPA design is to linearize the stages as well as to improve the circuit stability and increases the bandwidth. The performance of the proposed amplifier in this paper will be discussed in terms of stability, gain, power-added efficiency (PAE), and output power.