A power amplifier, suitable for short-range 60 GHz applications, is designed. The amplifier features two differential stages, using transformers for single-ended to differential conversion, impedance matching and inter-stage coupling. The amplifier makes use of unilateralization in order to improve stability and increase the ratio between minimum and maximum gain. The amplifier has variable gain from -3 dB to 10 dB, with a center frequency of 58.5 GHz and a bandwidth of 6.3 GHz. In the maximum gain state, the output -1dB compression point is +5.1 dBm, Psat is +8.5 dBm and the peak PAE is 7.7 %, drawing 52 mA from a 1 V supply.