A 0.22mm2 per Channel Data Link for Reinforced Isolation with >25kVpk Surge Tolerance and >295kV/μs Common Mode Transient Immunity

This paper presents an isolated data link for reinforced isolation $(\gt10$ kV surge tolerance) that occupies merely 0.22mm² per channel, the smallest known to the authors. Based on back-to-back transformers, the link surpasses a surge tolerance of 25kV and provides excellent timing with 6.5ps rms jitter, high CM transient immunity (CMTI) exceeding 295kV$/ \mu \mathrm{s}$ and low EM susceptibility. The design leverages a coupled resonator architecture to boost the signaling efficiency of tiny transformers and optimized TX controls of a 3.2GHz OOK carrier to maximize timing performance. With its multiple advantages, our compact design advances both the performance and density of isolation systems.