Analog Helpers#

Digital systems still touch the analog world.

No real system is purely digital at its edges. Something has to decide when a continuous voltage crosses a threshold, route an analog signal under digital control, hold a sample steady long enough to convert it, or condition a signal before it ever reaches a logic input. These parts sit on the boundary and are indispensable even in otherwise all-digital designs.

Sections#

• Comparators — Turning a voltage difference into a clean logic decision.
• Analog Switches — Routing analog signals under digital control.
• Sample & Hold — Freezing a value long enough to measure it.
• Op-Amps (Briefly) — Just enough analog conditioning to feed the digital world.