Editing Digital electronics (section)

===Design issues in digital circuits===
{{Unreferenced section|date=September 2015}}

Digital circuits are made from analog components. The design must assure that the analog nature of the components does not dominate the desired digital behavior. Digital systems must manage noise and timing margins, parasitic inductances and capacitances.

Bad designs have intermittent problems such as [[glitch]]es, vanishingly fast pulses that may trigger some logic but not others, [[runt pulse]]s that do not reach valid [[threshold voltage]]s.

Additionally, where clocked digital systems interface to analog systems or systems that are driven from a different clock, the digital system can be subject to [[Metastability (electronics)|metastability]] where a change to the input violates the [[setup time]] for a digital input latch.

Since digital circuits are made from analog components, digital circuits calculate more slowly than low-precision analog circuits that use a similar amount of space and power. However, the digital circuit will calculate more repeatably, because of its high noise immunity.