A fully-integrated linearized CMOS distributed amplifier based on Multi-Tanh principle for radio over fiber and ultra-wideband applications

The design of a linearized fully-integrated CMOS distributed amplifier with broadband distortion cancellation capability for ultra-wideband applications is presented. Measured linearized CMOS DA results showed that by reducing the IMD3 products of the linearized DA improves the IIP3 DA linearity which can lead to 5 dB improvement in the linearized DA C/IM3 power ratio. The linearized CMOS DA provides 7 dB measured peak power gain and rolls off to unity gain bandwidth of 8 GHz. The linearized CMOS DA attains better than -23 dB of reverse isolation, while requiring no off-chip components. Measured S₁₁ and S₂₂ are better than -10 dB over the entire bandwidth up to 10 GHz.