  With the evolution of heterogeneous computing system, such as
network-on-chip, high-performance distributed computing, accelerator-rich
architectures and cluster computing, high-speed, energy-efficient and
low-latency interfaces among memory-to-processor and processor-to-processor
become the key technology to enable those technologies. Simultaneously, the
scaling of CMOS makes the switching speed of the transistor up to sub-THz.
Radio-frequency or even millimeter-wave modulated signaling interconnect has
unique features in ultra-low power operation, dynamic allocation of bandwidth
and low latency, compared with convention baseband signaling interconnect. In
this work, we overview the different generations of radio-frequency
interconnect (RF-I) technology, compare them with conventional baseband
signaling interconnect technologies. The limitations and potentials are also
discussed in the end.
