[SI-LIST] What is meant by a differential signal
- From: Bharathkumar Raju <bharathrajupcb@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 22 Jan 2008 17:36:29 +0530 (IST)
Dear Members,
In my understanding unlike ethernet signals (Tx+ & Tx- and Rx+ & Rx-)
which are true differntial the USB signals are not true differential.
Differential means current flowing in one signal has to return back
through the counterpart. In the ethernet protocol Tx+ current will return
through Tx- and vice versa. The same holds good for Rx pair also. In an ideal
differential system current flowing through the midpoint (ground) will be
zero.
This is not the case for USB protocol. Here ground is the datum through
which the return current flows and under no circumstances the ground current
will be zero. Then why USB is identifed as a differential system?
Bharath
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