Glossary Definition for Analog Switch

Glossary Term: Analog Switch 

Definition

An analog switch (sometimes just called a "switch") is a switching device capable of switching or routing analog signals (meaning signals that can have any level within a specified legal range), based on the level of a digital control signal.

Commonly implemented using a "transmission gate," an analog switch performs a function similar to that of a relay.

Analog switch schematic diagram Analog switch circuit symbol

Transmission gate schematic diagram (left) and circuit symbol (right).

For example, an analog switch can turn an audio signal on or off based on a MUTE signal; or analog switches could send one of two signals to a headphone amplifier.

Most commonly implemented using CMOS technology integrated circuits. Maxim makes hundreds of examples.

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Synonyms
  • Switch
  • Transmission Gate

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