A 2.4 GHz high-gain low noise amplifier

In this work a design of a 2.4 GHz current reuse low noise amplifier (LNA) in a standard 0.35 mum SiGe technology is presented. In order to achieve good input matching for narrow bandwidth the inductive source degeneration LNA topology is used. Low power consumption with higher gain is obtained using current reuse configuration. In order to provide good isolation and stability cascode amplifier, as a part of current reuse topology, is used. For given configuration, good trade-off between low noise, high gain and stability has been achieved. Optimized LNA has -21.18 dB input return loss (S₁₁), high reverse isolation of -47.51 dB (S₁₂), very high voltage gain (S₂₁) of 23.54 dB, -15.93 dB output return loss (S₂₂), noise figure of 2.7 dB, and a power consumption of 5 mA at 3.3 V. The LNA presented offers high circuit stability parameters B_1f=979.6 m and K=7.658.