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A 70-GHz broadband amplifier is realized in a 0.13- mum CMOS technology. By using five cascaded common- source stages with the proposed asymmetric transformer peaking technique, the measured bandwidth and gain can reach 70.6 GHz and 10.3 dB under a power consumption (PDC) of 79.5 mW. Within the circuit bandwidth, the maximum input and output reflection coefficients are -6.1 and -10.8 dB, respectively. The group delay variation is plusmn 12.0 ps, and the output 1-dB compression point is 0.2 dBm at 5 GHz. With the miniaturized transformer design, the occupied core area of the circuit is only ~ 0.05 mm2 . This amplifier demonstrates a gain-bandwidth product of 231 GHz and a GBW/PDC up to 2.9 GHz/mW.