Overcurrent Detector Voting Circuit for Radiation-Tolerant ICs

The patent divides the overcurrent detection function into multiple independent comparators (at least two comparators) that operate independently. Each comparator monitors current through separate sensing paths, and their outputs are combined through logic circuitry. This segmentation ensures that a single radiation event cannot simultaneously affect all comparators, thereby maintaining detection reliability without requiring heavy shielding.

The patent uses multiple small-sized comparators instead of a single large comparator. Each comparator is sufficiently small to maintain fast switching speeds and low capacitance, yet the collective system provides radiation tolerance through redundancy. The segmented architecture allows each component to operate at optimal speed while the system as a whole achieves radiation hardness.

The patent implements a voting logic system where the complexity is localized to the logic combination circuitry that merges comparator outputs. The comparators themselves remain simple and identical in structure, maintaining ease of manufacture. The voting logic (requiring a selected number of comparators to indicate overcurrent before triggering detection) is concentrated in a dedicated logic stage, keeping overall design manageable while achieving high reliability.

The patent employs asymmetric or non-linear spatial arrangement of comparators within the integrated circuit layout. Rather than placing comparators in a symmetric or collinear fashion, they are positioned such that a single radiation track (ionizing particle path) is unlikely to pass through all comparator structures simultaneously. This asymmetric distribution provides radiation tolerance through geometric probability, and while it requires careful layout design, it does not demand extreme manufacturing precision beyond standard IC fabrication capabilities.