A Design Technique For Linear Desensitized LNAs

International audienceA new analytical design procedure utilizing addinga parallel amplifier for low noise amplifiers (LNA) is presented.In this method, the linearity and noise figure (NF) of the LNA isinvestigated in order to improve the LNA performance. Using thenoise Correlation matrix (CA), the noise parameters of the paral-lel network is calculated. It is proven that using this method, theinput impedance is less sensitive to noise matching. To evaluatethe proposed approach, two different LNAs using single and two-parallel paths are designed and the Electromagnetic momentum(EM) simulation results are compared. EM simulation result forthe designed 9-12 GHz LNA with the 0.1-μm pseudomorphicGaAs pHEMT model is reported to support proposed theories.The results represent that using the parallel method the linearity,input and output impedance matching, NF and gain can improvewith a 30% increase in power consumption