Low-Noise Amplifier Designs at 5 GHz

Adriana Serban and Shaofang Gong
University of Linköping, Department of Science and Technology ITN
Bredgatan 33, SE-601 74 Norrköping, Sweden, +46 11 36 34 78

Abstract
Two different designs of a low-noise amplifier (LNA) at 5 GHz are presented in this paper. The first design uses lumped elements for implementing the matching networks. The second design utilizes distributed element matching networks using microstrip lines. It is shown that the design using lumped element matching networks has difficulties to achieve high performance at a frequency of above 5 GHz and that distributed matching circuits are more adequate compared to the lumped element solution. Experimental results confirm the simulation results based on the LNA design with distributed matching networks.

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