24.9 A 128-QAM 60GHz CMOS transceiver for IEEE802.11ay with calibration of LO feedthrough and I/Q imbalance.

The 60GHz carrier with 9GHz bandwidth enables ultra-high-speed wireless communication in recent years [1–4]. To meet the demand from rapidly-increasing data traffic, the IEEE802.11ay standard is one of the most promising candidates aiming for 100Gb/s data-rate. Both higher-order digital modulation such as 128QAM and channel bonding at 60GHz are considered to be used in the IEEE802.11ay standard. However, the more severe requirements of LO feedthrough (LOFT) and image-rejection ratio (IMRR) have to be satisfied, so much higher accuracy in built-in calibration circuitry is required across the entire 9GHz spectrum for LOFT and I/Q imbalance calibration to achieve the required EVM.