A 3–5 GHz fully differential power amplifier for low power medical applications

This paper presents the design of a CMOS UWB power amplifier operating in the 3-5 GHz frequency range. The proposed circuit is based on a fully differential topology performing in AB-class to achieve a better linearity and using a bandpass filter network with a shunt feedback technique to obtain wideband matching and flat gain. The design was performed using 0.18 μm technology and simulations results showed a flat power gain of 15.5±0.4 dB across 3-5 GHz band frequency, good input and output return losses with S11 and S22 below -13dB both and excellent phase linearity with a group delay of 18.4 ps while consuming only 25.46 mW from 1.8 V dc, supply.