Wireless devices support multiple functionalities using amultitude of standards. In the WiFi ecosystem, for example, we have seen theaddition of the new Gb/s flavors of 802.11ac and 802.11ad (WiGig). Hence, newWiFi-supporting devices have to deliver superior performance in each of thesestandards, and should operate seamlessly from standard to standard. Theserequirements demand replacing traditional designs with innovative solutions atsystem, architecture and circuit levels. In this work, we tackle the physicallevel challenges with a configurable transmitter architecture. This workdemonstrates the concept of a single-PHY transmitter baseband architecture for11ac and 11ad standards. The core of the proposed transmitter is a configurablemixed-signal digital-to-analog converter, which has an embedded semi-digitalfiltering tailored for four WiFi modes (20, 40, 80 and 160 MHz bandwidths) andthe 1.76 GHz bandwidth of the 60 GHz WiGig standard. The baseband signals ofthe different modes and standards are digitally processed to a common inputfrequency of 3.52 GHz at the filtering DAC. Then a set of current sources of acurrent-steering DAC-based structure is configured using a-priori knowledge tofit the transfer function of the modes to be transmitted.
Utilizing the D and G-bands requires rethinking wirelesssystem design from the ground up, including hardware and signal processing. We are focusing on architectural and system solutions using silicon-based hardware that allow a combination of beamforming, diversity, spatial multiplexing andspace division multiple access gains tailored to the unique characteristics ofthe mm-wave outdoor channel. This cohesive approach introduces disruptivetechnology, which will revolutionize how we communicate wirelessly. This talkwill show examples of D-band ICs for wide-band communication systems.