GUARD: A Fully-Digital TDC-Based Clock and Voltage Glitch Detector with On-Demand Protection in a 28nm CMOS

We present GUARD, a clock and voltage glitch detector with on-demand protection using clock gating, supporting clock frequency up to 1.2GHz. It achieves 100% detection and protection accuracy on a victim MCU under glitch attacks of different profiles as small as 100ps, robustly across -40-125°C and 0.6-1.1V. GUARD can also differentiate normal IR drops from real glitch attacks to prevent unnecessary protection overhead. It consumes $2958\mu\mathrm{m}^{2}$ and 0.874mW/100MHz.