An FR3 Simultaneous Dual-Carrier Passive Mixer-First Diplexer Receiver Front-End Achieving 6.4 dB NF and -3.2 dBm B1dB

A low-power high-dynamic-range passive mixer-first diplexer receiver front-end is presented for the 6G FR3 band. The architecture simultaneously down-converts two arbitrary bands through a single RF port and consists of two passive mixers in parallel, each coupled to the antenna by λ/4 impedance transformers that minimize cross-loading while providing impedance transparency and out-of-band (OOB) filtering. The architecture achieves high performance with low power consumption by driving the mixers directly with integrated Class F-1 harmonically enhanced (HE) quadrature oscillators. The 11.8–13.9 GHz prototype is implemented in a 16 nm FinFET process and achieves a 6.4 dB noise figure (NF), -3.2 dBm OOB blocker compression (B1dB), and 10 dBm OOB input-referred third order intercept point (IIP3) while consuming 12.7 mW per channel.