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Re: Attention Cable Braiders

I don't think that a braided quad would do much for single ended cables, simply because half of the wires (choose your plane) would just barely provide rough "shielding" in places - there's no inverted signal on'em, they're just an extension of the ground-plane - no CMNR as far as I can tell, but correct me if I'm loony.

Don't think in terms of literal shielding. That's not what's actually going on in this case.

Instead, think of loop area and inductance.

The greater the loop area, the greater the inductance and vice versa.

In terms of a parallel pair of conductors, such as in an interconnect or speaker cable, the closer the conductors are to each other, the smaller the loop area and the lower the inductance.

For a given magnitude of an external magnetic field impinging on the loop, the greater the inductance of the loop, the greater the induced votlage from the external magnetic field. Conversely, the lower the inductance of the loop, the lower the induced voltage.

The lower the induced voltage, the lower the induced noise, regardless of whether the interface is single-ended or balanced. A balanced interface only has the additional advantage of further reducing noise by way of common-mode rejection at the differential input of the input stage.

But both benefit from reducing the noise voltage in the first place. And a quad geometry has a smaller effectivel loop area compared to a paired geometry which means further reduction of induced noise.

Make sense now?

se




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