15. Inductor Basics

Question.1

Shantanu adds a 10 µH SMD power inductor (marked “100”) in series with the 3.3 V rail, hoping to reduce high-frequency noise entering his analog sensor.

However, the sensor still exhibits digital noise artifacts, and EMI doesn’t improve.

What is the most likely mistake?

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The inductor’s DCR is too high, introducing ripple
The inductor blocks low-frequency signals but not high-frequency noise
Power inductors are not optimized for EMI filtering — ferrite beads are better suited
The inductor is shorted internally