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This letter presents a low-noise amplifier with a 3 dB-bandwidth, from 55 to 74 GHz, excellent noise performance and low power consumption based on a three-stage common-source topology. For the first time to the authors' best knowledge, an analytical equation that also considers the gate-drain capacitance is derived for the employed shunt-series transformer feedback input matching network. To enable shunt-series transformer feedback matching without significant gain reduction a highly asymmetric transformer is designed. Furthermore, a compact transformer-implemented T-shaped output matching network is investigated to minimize the required area. To prove these concepts, the circuit has been fabricated in a 22 nm fully depleted silicon-on-insulator technology. Thanks to the transformer-based matching, an ultra-compact active footprint of 0.039 mm 2 is achieved. At a power consumption of 8.4 mW from a 0.41 V supply an average noise figure of 4.8 dB and a peak gain of 14.2 dB has been measured. In-and output matching better than −10 dB over the 19 GHz wide 3 dB-bandwidth are demonstrated.

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