A 65 nm CMOS 330 Mb/s microwave backscatter link at 2.4 to 2.9 GHz with ambient blocker cancellation

This letter discusses the implementation of microwave backscatter links in CMOS technology which are similar to existing systems at mid-UHF for RFID, but intended for use at the 2.4 GHz ISM band towards higher data-rate wireless connectivity solutions. The demonstrated microwave backscatter link uses CMOS RFIC implementation as opposed to discrete components, enabling low power consumption, while maintaining a high modulation bandwidth. Similar to RFID readers, the prototype link also cancels the carrier self-leakage and ambient reflection with internal calibration within a base-station chip. The demonstrated link is implemented and characterized in a 65 nm CMOS technology and is shown to provide 330 Mb/s of raw data-rate with BERs better than} 10^-9 over distances up to 2.5 m.