A miniaturized Wilkinson power divider implemented in a standard 0.18-m CMOS process is presented in this letter. By using active inductors for the circuit implementation, a significant area reduction can be achieved due to the absence of distributed components and spiral inductors. The power divider is designed at a center frequency of 4.5 GHz for equal power dividing with all ports matched to 50 . Drawing a dc current of 9.3 mA from a 1.8-V supply voltage, the fabricated circuit exhibits an

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... sertion loss less than 0.16 dB and a return loss better than 30 dB at the center frequency while maintaining good isolation between the output ports. The active area of the miniaturized Wilkinson power divider is 150 100 m 2 , which is suitable for system integration in monolithic microwave integrated circuit (MMIC) applications. Index Terms-Active inductors, lumped power divider, miniaturization, monolithic microwave integrated circuit (MMIC), regulated cascode, Wilkinson power dividers.