Design of a Low Noise Amplifire (LNA) with Image Rejection Filter

Abstract

In this paper we present a new LNA with image rejection filter. Furthermore, after determining topology, we used a suggested multi objective genetic algorith m to optimize the LNA. By performing the algorithm, several results will be obtained as they have no priority to each other, so we can select whichever we want, according to our need. Simulation results show that the suggested plan weakens the image considerably; it also increases LNA gain without changing the noise figure (NF), output matching and input matching. Algorithm program is written by MATLAB and the circuit simu lated by Hspice RF with 0.18μ technology.