Active Cancellation for Frequency Division Duplex Communication

Lucas Calderin, Sameet Ramakrishnan, Elad Alon, Borivoje Nikolic and Ali Niknejad

Defense Advanced Research Projects Agency and Intel

This project is an active transmitter (TX) cancellation scheme for FDD that synthesizes a replica of the TX current in shunt with the receiver (RX), virtually shorting out the TX signal for the RX while having minimal impact on TX insertion loss. The cancellation scheme includes thermal and phase noise mitigation techniques to minimize receiver desensitization in the presence of large TX power.