The document summarizes modeling a 2-input comparator circuit using PSpice. It includes the equivalent circuit diagram showing the two inputs (IN+ and IN-), output (OUT), and components including resistors R1-R3 and capacitor C1. It also shows the PSpice simulation configuration, with inputs V1 and V2 configured to switch between 0V and 5V with different time delays and pulse widths to test the comparator output.