Comparison of various 2.4GHz LNA topologies

In this paper two 2.4GHz low noise amplifier (LNA) configurations in austriamicrosystems 0.35μm SiGe BiCMOS technology are presented. Drawbacks and advantages of amplifiers in terms of their Figures of Merit (FOMs) and power consumption (P
_D
) are showed. A current reuse LNA has voltage gain (S
₂₁
) of 23.9dB, noise figure of 2.73dB and input/output return loss of -17.9dB/-14.6dB, while consuming 4.9mA from 3.3V supply. A cascade two-stage LNA achieves 24dB of voltage gain, 2.98dB of noise figure and input/output return loss of -15.5dB/-21.8dB, consuming 4.6mA from the 3.3V supply. Both amplifiers offer high circuit stability parameters.