A broadband and deep-TX self-interference cancellation technique for full-duplex and frequency-domain-duplex transceiver applications

Full-Duplex (FD) radios, capable of simultaneously transmitting and receiving on the same frequency, have evolved as one method to address future demand for higher data-rates. Although recent highly integrated full-duplex radios [1-4] show promise towards improving spectral efficiency by >1.9x [5], mitigating transmitter (TX) self-interference (SI) for broad-bandwidth signals remains a major challenge, particularly for longer range transceivers requiring a high-output-power PA. This paper describes a CMOS transceiver with a deep TX SI cancellation performance over a very wideband (65dBc/80MHz and 70dBc/40MHz).