what is the difference between differential &single ende

what is the difference between differential &single ended signals?

Re: what is the difference between differential &single

a single ended signal is measured as the excitation with respect to a fixed reference. Differential signals are measured at two nodes and both nodes have a positive and a negative excitation. These excitations occur around a fixed reference.

The main advantage of differential is that many noise sources become common.

Re: what is the difference between differential &single

demodb said:

a single ended signal is measured as the excitation with respect to a fixed reference. Differential signals are measured at two nodes and both nodes have a positive and a negative excitation. These excitations occur around a fixed reference.

The main advantage of differential is that many noise sources become common.

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Demob,
You are correct for the single ended answer. but a differential signal consist of a difference between 2 mutual inverted signals. There is no signal reference to any common reference, fixed or floating.

In some applications not galvanically isolated from each other, the driver electronics needs a common reference, but this has nothing to do with the differential signal itself, only the electronics involved.

A differential signal is ideally not susceptible to common mode noise.

TOK

Single ended are are mostly wsed in day-to-day life we take one signal line with respect to a reference mostly zero potential (Ground) but there are many disadvantages in it if a interference EMR is applied on the line it is added to the signal as the ground remains unaffected by the EMR. so you need a shield to the signal line with a reference (coaxial cable) where all the interference are absorbed by the reference.

Differential are previously used for precision circuits as it requires more resource compared with single ended. it works by sending a 90 degree phase shifted waves in 2 different lines with respect to a common reference. So when a EMR is applied it will affect both the wires so it will become a common mode signal so it is automatically filtered in amp in the front stage of the receiver, so it is used nowadays in high frequency systems as the effect of interference is more at high frequency operation.

Re: what is the difference between differential &single

puviarasu said:

Differential are previously used for precision circuits as it requires more resource compared with single ended. it works by sending a 90 degree phase shifted waves in 2 different lines with respect to a common reference. So when a EMR is applied it will affect both the wires so it will become a common mode signal so it is automatically filtered in amp in the front stage of the receiver, so it is used nowadays in high frequency systems as the effect of interference is more at high frequency operation.

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I think the phase shift is 180 deg, not 90, and there is no common reference for the differential signal. An example: A LAN 10[100]Base connection. Where is the common reference? It is a differential connection!

TOK

Hi
Here is a link about differential signal:
https://www.latticesemi.com/dynamic/index.cfm?fuseaction=view_faqs&qid=PAC15

single ended is simple connection for low speed (boud rate) and clear (not noisy) environment.
differencial ended (balanced) is not simple but it is used for noisy environment with very higher speed.