Abstract: This letter presents a 5-GHz quadrature digital power amplifier (DPA) with serial transformer power combiner and in-phase and quadrature (IQ)-cell-sharing, which overcomes the 3-dB power ...

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Abstract: This article presents a new electronic device – the four-port quasi-circulating quadrature hybrid (QCQH), which combines desirable features of electronic circulators and quadrature hybrids.