The present invention provides a power gain-boosting technique for an amplifier in order to compensate for the decrease of Gmag in a transistor at high frequencies. A power gain-boosting technique of the present invention comprises the steps of: finding the Maximum Unilateral Gain or Mason's Invariant U of a transistor; designing a linear, lossless, reciprocal network embedding the transistor so that the final equivalent S-, Y-, or Z-parameters satisfy the condition: S ⁢ 21 S 12 = Y 2 ⁢ ⁢ 1 Y 1 ⁢ ⁢ 2 = Z 2 ⁢ ⁢ 1 Z 1 ⁢ ⁢ 2 = - [ ( 2 ⁢ U - 1 ) + 2 ⁢ U ⁡ ( U - 1 ) ] ; embedding the transistor into the linear, lossless, reciprocal network; and constructing simultaneous conjugate matching.