Electronics Hardware Engineer - Interview Questions and Answers

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1. Which produces more noise? Linear Regulator or Switch-mode power supplies?

 Compare to Linear regulator, Switch-mode power supplies have more output noise. Let’s see Why Switch-mode power supply output has more noise.

Linear regulators are simple voltage regulator circuits commonly used in electronics. it uses a closed feedback loop to bias a pass element to maintain a constant voltage across its output terminals. Linear regulators are step-down converters, meaning that the output voltage will be always less than the input voltage.


Functional block diagram of Linear Regulator


A basic DC-DC converter takes the current and passes it through a high-frequency switching element, which turns the DC signal into an AC square wave signal. This wave is, then passes through another filter (LC) which turns it back into a DC signal of the required voltage. Due to the high frequency switching DC-DC converter always has some ripple voltage on the output.
Functional block diagram of  DC Buck Converter

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