RF Signal Processing in Silicon: From Sub-THz Beamforming to Ultra-Broadband Spectrum Sensing

Abstract:

The growing demand for ultra-high-data-rate connectivity and high-resolution imaging is pushing wireless technologies into the mmWave and sub-THz spectrum (30–300 GHz). While this spectrum offers unprecedented bandwidth, its practical use is challenged by severe path loss and the limited efficiency of silicon transistors at these frequencies.

To overcome these challenges, I will present our recent innovations in RF-domain signal processing in silicon that enable scalable beamforming architectures and energy-efficient processing of extremely wide bandwidths. I first will introduce two key building blocks for scalable sub-THz beamformer arrays: a trombone-inspired sub-THz phase shifter that achieves calibration-free, precise phase control, and an ultra-compact, high-power sub-THz bidirectional transceiver front-end. I will then present an RF-domain signal processor inspired by phased-array principles that enables energy-efficient, ultra-broadband spectrum sensing beyond the limits of conventional digital approaches.