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Old 12 April 2020, 22:11   #16
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Join Date: Aug 2014
Location: Netherlands
Posts: 325
Originally Posted by grond View Post
It's not energy, it's a potential difference. One that may produce a proportional current flow but usually doesn't because of the non-linearity of circuits such as semiconductor circuits. That's precisely the reason why digital circuits are essentially overdriven analogue amplifiers: they operate in non-linear mode and thus suffer much less from power supply noise.
Ripple current is more of an issue on the input side of a switched dc/dc converter. A buck converter with a small input cap and a low impedance path to tbe power source will draw a lot of ripple current and emit a ton of interference if not dealt with properly.
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