The design of a fully-integrated CMOS linearized distributed amplifier (DA) architectures with broadband linearization and a tunable linearity capability for ultra-wideband applications are presented. DA IIP3 linearity is improved by using feedforward, multi-tanh and cross-quad feedback distortion cancellation based CMOS DA gain cells. Simulations were performed in CMOS 0.18 ??m process technology and the results show that reducing the IMD3 products of the linearized CMOS DA which improves the linearized DA C/IM3 power ratio.