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It is a good practise to place a ferrite bead in DC/DC's output for high speed CPU or DSP core power?

SuitJune Young
Genius 3985 points

HI,TIer.

Right now, we are using DM8168 to develop our audio/video recorder.

However,the referrence design by Udworks version 03A is that: place three/four ferrite bead parallel in DC/DC's output.

However, according to the TI's power measure doc, we should measure the power noise up to 250MHz frequency.

So,when the frequency goes up to 200MHZ,the ferrite bead will be like a resistor,and the output will be like a R-C charging circuit,then can not charge ouput capacitor quickly,then the transient response will not be good.

And last,I think, when in high speed CPU/DSP core power, the ferrite bead should NOT be placed in the output.Am I right?

Expecting for any reply.

BR!