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Bypass capacitor placement

DihydrogenMonoxide

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My project uses a BME280 for measuring temperature and humidity. This device requires 2 capacitors but also thermal decoupling from the rest of the board.

Because I won't be doing a copper fill near the BME280, I need to decide whether the caps should be closer to the ground plane or closer to the sensor.

Which approach is better here?
 

d123

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KlausST

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Hi,

The whole loop is that matters. If one part of the loop is bad, the whole loop is bad.
Read about
* lengthy wiring
* wiring impedance
* area enclosed by the loop
....

Klaus
 

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