Design and Implementation of a Reconfigurable Dual Band Low Noise Amplifier for Modern Receiving Systems

Abstract

In modern wireless communication receivers, the low noise amplifier is an essential electronic device used to amplify the received signal without adding further noise to it. This paper introduces a design and of a reconfigurable low noise amplifier working with dual frequency bands at 1.57 GHz for GPS and 2.4 GHz for Wi-Fi applications. This amplifier is based on the pHEMT ATF 34143 transistor and has been built by means of microstrip lines on Rogers RO4350B substrate. The reconfiguration process of the two fundamental frequency bands is implemented using a single pole double throw switch circuit. This circuit consist of four PIN diode switch to change and route the amplified RF signal from the transistor into the desired output matching network. The simulated results of the SPDT circuit show a low insertion loss, return losses and high isolation at desired frequency bands. At 1.57 GHz, the simulated results of the reconfigurable low noise amplifier indicates a power gain of around 14.6 dB, low noise figure of around 0.35 dB, and input/output return losses of less than -12 dB, while at 2.4 GHz the recorded power gain is about 11 dB, the low noise figure is around 0.58 dB, and the return losses are less than -12 dB. These results provide suitable performance of a reconfigurable dual band low noise amplifier at two different bands and for multi-function wireless communication systems.