The simulation of a broadband amplifier for broadband applications

Abstract

Ultra-wideband is a wireless technology that transmits an extremely low-power signal over a wide swath of radio spectrum. Ultra-wideband systems operate across a wide range of frequencies from 3.1 to 10.6 GHz. As no carrier wave is needed, this technology consumes extremely low power and the long battery life is possible. In this paper, the broadband amplifier has been designed and simulated with RF CAD TOOLS - the Advanced Design System 2004A (ADS 2004A) for operation frequency between 3 to 10 GHz. This broadband amplifier was designed by using the PHEMT device produce by Filtronic Semiconductor, the FPD6836. The main specifications requirement for the circuit was to get a flat gain around 25??5 dB and above at overall with reflection coefficient below -10 dB. The first stage of designing the broadband amplifier is to select the type of transistor which suitable for low noise amplifier. After that, the biasing circuit input matching network and output matching network was designed. The simulations for the design in ADS2004A include the DC analysis and also S-parameter simulation. Optimization for the circuit has been done by changing the lengths and widths values of the microstrip lines.