A Design Technique For Linear Desensitized LNAs

A new analytical design procedure utilizing adding a parallel amplifier for low noise amplifiers (LNA) is presented. In this method, LNA’s noise Figure (NF) and linearity have been investigated with the aim of improvement in its performance. Using the noise Correlation matrix (C
A
), the noise parameters of the parallel network is calculated. It is proven that using this method, the input impedance is less sensitive to noise matching. To evaluate the proposed approach, two different LNAs using single and two-parallel paths are designed in the frequency range of 9-12GHz using 0.1-× mGaAs pHEMT model and the Electromagnetic momentum (EM) simulation results are compared. The results represent that using the parallel method the linearity, input and output impedance matching, NF and gain can improve with a 30% increase in power consumption.