Abstract
This study presents a design of low noise figure, high gain LNA at 5.8 GHz with cascaded and cascoded techniques using inductive drain feedback that is applicable for the WiMAX 802.16 standard. The amplifier uses Pseudomorphic High Electron Mobility Transistor FHX76LP super HEMT low noise FET. The Ansoft Designer SV as an Electromagnetic (EM) simulator was used during the design process. The LNA was designed using the inductive drain feedback, inductive generation to the source and the T-network as a matching technique was used at the input and output terminal. The cascaded and cascoded Low Noise Amplifier (LNA) produced a gain (S21) of 43.94 dB and the Noise Figure (NF) of 0.61 dB. The input reflection (S11), output reflection (S22) and return loss (S12) are -10.65, -20.02 and -52.23 dB, respectively. The measured 3 dB bandwidth of 1.24 GHz has been achieved. The input sensitivity is -84 dBm exceeded the standards required by IEEE 802.16 has been observed.
Highlights
Over the past few years, wireless communication is an area that is growing rapidly and the latest technology applications created for the growth of the relationship between the progress of people or companies around the world
The design of the cascoded Low Noise Amplifier (LNA) has a new technique and topology, where we introduced an inductive feedback L6 is connected to the drain of the M1, inductive source generation L10, which is connected to the source M3 while inductive L5 is placed between the source and drain of M2 and M3 (Fig. 6)
The recorded result for the single LNA cascaded with cascoded LNA gain S21 is 43.94 dB
Summary
Over the past few years, wireless communication is an area that is growing rapidly and the latest technology applications created for the growth of the relationship between the progress of people or companies around the world. Where they can measure and control the entire work process, analyze data in real time, lower cost, improve reliability and requires a continuous and nonstop searching for new technologies with greater capacity (Fourty et al, 2005). WiMAX is one of the new standards developed recently It covers a large area and allows a huge data rate. The construction of the RF front-end receiver for WiMAX application becomes an arduous task considering the complicated challenges of achieving the standard set
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