This paper presents the survey of the design of Low Noise Amplifier (LNA) for different wireless applications. This paper focuses diverse design techniques and new architectures in the design and implementation of low noise amplifier such as self-biased, forward bias, common source cascade, Cascode, body bias and LNA based on dual resonance techniques. These design methodologies are serving to reduce the power consumption and enhance the performance such as gain and noise factor in wireless applications. In this paper, recent design methodologies of different LNA is meticulously analyzed and new design method will be proposed to enhance the performance of the LNA.

The paper proposes the design of bandpass filter using meander structure. The application in which it can be used includes WLAN applications used for vehicular communication. The feed arrangement used in this structure includes coupled feeding using SIR. The low insertion loss in this structure is achieved by modifying the properties of meander. The dimension of the meander structure and distance between the two meander is adjusted to provide low insertion and return loss. Coupling effect takes place between the meander and SIR to provide output at the ports. Thus insertion loss and return loss are effectively obtained and the structure can be used for WLAN applications.

MAC unit is mostly demanded in the DSP application. It performs the both addition and multiplication. Here the MAC unit is designed by using the parallel prefix adders like kogge-Stone adder, Brent-Kung adder, Han-Carlson adder and Ladner Fischer adder these adders are the high-speed adders to improve the speed of MAC unit and multiplication purpose. In this design, these four adders are implemented to the array multiplier and to design the MAC unit. The performance and analysis of MAC unit is done by the Verilog HDL and the MAC unit is simulated and synthesized in Xilinx ISE 14.7 for Spartan-6 family technology. The simulation results show that low power, high speed and low area consumption MAC unit.

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