Design of a Multi‐Octave UWB Power Amplifier Combining the Extended Continuous Class‐GF/GF ⁻¹ Modes

ABSTRACT This paper proposes an innovative design approach for multi‐octave ultra‐wideband (UWB) power amplifiers (PAs). The approach combines extended continuous‐mode class‐GF and GF −1 modes to simplify the PA structure while achieving multi‐octave bandwidth. This approach can simplify the design of power amplifiers while simultaneously achieving multi‐octave capabilities. To validate the feasibility of this concept, the paper utilizes the traditional low‐pass network to control the second and third harmonics of the two modes, finalizing the design of the PA's output network. The test results show that, within the frequency band of 0.4–3.2 GHz, with a bandwidth of 156%, the UWB PA achieves seamless conversion between extended continuous class‐GF mode and extended continuous inverse class‐GF mode. The PA has demonstrated remarkable performance metrics, including an efficiency exceeding 58.8%, a gain surpassing 9.2 dB, and an output power exceeding 39.2 dBm. Moreover, the size of the circuit is 66 mm × 30 mm.