A 0.8-5.8 GHz Ultra-Wideband Power Amplifier Based on Dynamic Renormalized References

This brief presents an ultra-wideband (UWB) power amplifier (PA) utilizing a 10 W packaged GaN transistor based on the dynamic renormalized loadpull method. The desired load optimal regions (ORs), indicating high PA performance, are firmly anchored at the center of the Smith chart normalized by a series of complex references. The consistency in band and radial monotonicity of ORs in the dynamic system provide the convenience of a uniform treatment over a broadband range, thereby simplifying the design constraints for broadband output matching networks (OMNs). Based on the well-feasible method, the fabricated UWB PA was experimentally validated and measured, exhibiting a saturated output power of 39.6-41 dBm, a power-added efficiency (PAE) of 49.8-68.4%, and a saturated power gain of 5-12 dB over a broad range from 0.8 to 5.8 GHz. Compared to the state-of-the-art broadband PA designs, this presented PA has the broadest bandwidth and better-balanced characteristics.