loose-electron
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Best Design Tool = Capable Designers
Posts: 1638
San Diego California
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The USB system exchanges differential data. It might be a better question - what is the need for the single ended receiver in your block diagram?
As for why differential? Look up "LVDS" (Low Voltage Differential Signalling") and read up on that.
Faster data rates, lower current, noise immunity, freedom from good ground connections between RX and TX to name just a few.
THere's a bunch of stuff out there on the LVDS advantadge. Google it.
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