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A divide-by-3 semi-dynamic frequency divider (SDFD) with active balun is presented using the current-reused technique. The proposed SDFD is composed of a Gilbert cell mixer, one stage of static divider and an active balun. The LO switching stage of the Gilbert cell mixer is also the current source of the static frequency divider to construct the current-reused architecture. At the incident power of 0 dBm, this frequency divider operates at the maximum bandwidth of 1100 MHz from 21.5 to 22.6 GHz. The power consumption of the divider is 12 mW at a 1.5 V supply voltage.