'Dithering' brings new RFI worries

It's well known that switching type power supplies can
generate nasty RFI spurs particularly in the AM broadcast band.

Now, some designers are turning toward dithering the power supply switching frequency, courtesy of a built-in random number generator to move the interference around.

Dithering is really a buzzword standing for intentional frequency shifting. With this approach, instead of having a lot of intrference on one frequency, the RFI will be thinned out and spread across a swath of the RF spectrum.

This means gear using dithered power supplies could,
conceivably, wind up bothering a frequency near you.

Source: ARNewsline, CGC

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