Comparators & Non-linear. This is where analog meets digital. Study the Inverting Schmitt trigger in depth. Bakshi includes excellent graphs showing the transfer characteristics (VTC). Learn the formula for Upper Threshold Point (UTP) and Lower Threshold Point (LTP).
Months later, at a small campus presentation, she titled her poster "What Listens: Analog Recognition with Simple Circuits." A professor who had taught Rhea years ago paused, smiling at the battered textbook on her display table. He told her, quietly, that the margin notes had once belonged to him — a young instructor who used to scribble experiments for students. He had given that very copy away years ago, pleased to see it find another mind. Comparators & Non-linear