i wanna know what is meant by differential data signals as for example in usb cable there where Data- and Data+ terminal which carry differential data signals what is meant by that??What is meant by differential data signals?
This is a device to reduce interference. The two data lines run in a cable which may be subject to interference; however that interference will affect both data lines equally. The two lines go to the input(s) of a differential amplifier, which amplifies the difference signal but ignores the so-called common-mode signal appearing equally on both data lines. In audio this is known as a balanced line and is a necessity for running long cables.
If you didn't do this, you'd have a low-impedance ground which wouldn't be affected much by the interference, and a higher-impedance data (or audio signal) line which would be more affected. This would run into a single-input amplifier which would amplify the noise as well as the signal.What is meant by differential data signals?
It means the two signals are balanced with respect to ground, which reduces crosstalk and noise pickup and noise generation.
That means if you are sending a 1 volt digital signal (logical 1), one line would be at +0.5 volts, while the other is at 鈥?.5 volts, with the difference is 1 volt. Logical 0 could be both at zero, or half volts at the opposite polarity.
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