Automated photocurrent and bussing extraction for dose-rate rail span collapse simulations

A simulator capable of simulating rail span collapse from layout-level inputs was developed. The simulations require radiation-induced photocurrent partitioning among proximal physical collection regions and electrical contacts to the power distribution network. The simulation approach incorporates simple geometric rules for current division inside a contiguous region along with the automated extraction of the power distribution network. Experimental results to verify the current division algorithms are also presented. Pixel-plane and scan-line techniques used for the automated extraction of the power distribution network are described. For simulation of the circuit, a simulator using conjugate-gradient algorithms is used. A postsimulation processor maps the actual supply rails onto the layout itself for easy identification of critical subcircuits