In this paper, an MMIC broadband amplifier for wireless communication systems has been developed by using an active feedback method. This active feedback operates at much higher frequencies than a method by a spiral inductor feedback and its size is independent of the inductance value. The MMIC broadband amplifier was designed using a $0.5{;}{mutextrm{m}}$ MESFET library. The fabricated chip area was $1.4{;}mm{;}{ imes}{;}1.4{;}mm. Measurement showed a gain of 18 dB with a gain flatness of ${pm}3$ dB in a 1.5 GHz~3.5 GHz band. The maximum output power and the minimum noise figure were 14 dBm and 2.5 dB in the same band, respectively.