A single-chip in-band full-duplex low-IF transceiver with self-interference cancellation

A 3.8-4.8GHz single-chip in-band full-duplex (FD) transceiver with self-interference cancellation (SIC) is reported. The RX has a noise figure (NF) of 3.1dB/6.3dB at 10MHz/50kHz IF with TX and SIC off. The 1/f noise corner is 60kHz, more than one order of magnitude lower compared to prior work. Moreover, for the first time, the operation of RX and SIC is demonstrated when a co-integrated TX is active at the same time and generating more than 20dBm output power. When TX and SIC are on, at -10dBm SI power, the NF is 6.8dB/11.1 dB at 10MHz/50kHz IF. This is lower by 5.6dB/9.6dB at 10MHz/50kHz IF compared to the NF with SIC off.