Abstract: In order to improve the performance of existing broadband LNA topology cirtuits，a broadband low noise amplifier architecture combining cross-coupling and negative feedback technology is proposed，which further introduces a new negative feedback structure by adding PMOS transistors that are cross-connected from the output to the input based on a composite NMOS/PMOS cross-coupled inductorless broadband differential shunt feedback commonsource low-noise amplifier ( SFCS-LNA) ． By adjusting the transconductance of the adding PMOS transistors to composite NMOS/PMOS cross-coupled SFCS-LNA， the degree of freedom of the LNA was increased，and the problem that the feedback resistance of the original composite NMOS/PMOS cross-coupled SFCS-LNA is limited by the input matching was solved，which could independently increase the resistance of the feedback resistor while the input matching is maintained，minimizing the contradictions of mutual restraints between noise， input matching and gain of the LNA． The results show that the LNA architecture can effectively reduce the noise figure and improve the voltage gain of the LNA． 

Key words:  low noise amplifiers, broadband, input matching, cross-coupling, negative feedback