Analog-Digital Approximate DFT with Spatial ∆-Σ LNA Multi-beam RF Apertures. - Arjuna Madanayake; H. Pilippange; Keththura Lawrance; A. Uddin; S. Mandal; J. Di; M. Tennant; C. Workman; Renato J. Cintra (ISCAS, 2025)