A differential power amplifier (PA), designed using the linear-phase filter model, for a BPSK modulated ultra-wideband (UWB) system operating in the 3-5 GHz frequency range is presented. The proposed PA was fabricated using 0.18 μm SMIC CMOS technology. To achieve sufficient linearity and efficiency, this PA operates in the class-AB region, delivering an output power of 8.5 dBm at an input-1 dB compression point of-0.5 dBm. It consumes 28.8 mW, realizing a flat gain of 9.11 ± 0.39 dB and a very low group delay ripple of±8 ps across the whole band of operation.
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