What is 'analog switch' 🧑‍🔧

After a few colleagues asked for my assistance on the subject, I decided to write about "What is 'analog switch'". If you're still unsure, stick with me…

So the fastest answer is…

A device that either transmits an analog signal without distortion or completely blocks it. Also: Any solid-state device, with or without a driver, capable of bilaterally switching voltages or current.

An analog 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.

Do you know what makes people curious? Here are a few questions and answers:

Analog switch

What is charge injection in an analog switch...

A. Charge injection in analog switches and multiplexers is a level change caused by stray capacitance associated with the NMOS and PMOS transistors that make up the analog switch. The Figure below models the structure of an analog switch and the stray capacitance associated with such an implementation.

What is an analog signal...

Analog signals represent one continuous variable as the result of another continuous time-based variable. They are capable of outputting continuous information with a theoretically infinite number of possible values. We have seen analog signals in use in nearly every type of signal processing and consumer electronics application imaginable.

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Note to self: Post outline OK.