Decades ago, perhaps one of the first practical lessons a circuit designer would learn at the outset of their career was the art of decoupling using a combination of different value capacitors. A good mentor would explain that because of their physical characteristics, different value capacitors were optimal for filtering different frequency bands. This author even remembers designing a decoupling network for a 25W buck converter that included the parallel combination of ceramic capacitors of 1 μF, 0.1 μF, 0.01 μF, and 1000 pF in value. The network performed well once the component leads were made short enough!
blog.Mini-Circuits.com
July 31, 2023
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