The　linearity　of　the　wireless　communication　circuits　became　more　important　with　the　progress　of　the　communication　technology.　The　nonlinearity　of　the　power　amplifier　(PA)　in　the　wireless　communication　circuits　can　directly　lead　to　non　line　arity　of　circuit　system,　so　it　is　important　to　use　linear　modulation　techniques　to　improve　the　nonlinear　distortion　of　PA.　This　paper　describes　a　novel　approach　of　using　a　diode　as　an　active　linearizar　to　minimize　nonlinear　distortion.　In　case　of　pHEMT,　this　technique　reduces　the　effect　of　nonlinearities　in　power　amplifiers　due　to　voltage　variable　input　capacitance.