What exactly is longitudinal Conversion Loss

Hi,
while goin through some analog communication circuits i came across this term..I d like to know what exactly that means?
Is it related to common mode voltage effects on a differential signal?

Thanks

Hi,

in theory, a differential signal is obtained by using 2 inputs signals related to a reference node that is called the common voltage mode(the inputs didn' connect to the GND).Altough, the differential meassurements eliminate the effects of common mode voltage .
For example:if one of the input of a differential amplif. is 3V and the other input is 2.5V, the differential voltage will be 3-2.5=0.5V.But the common mode voltage will be 2.5V representing the lower signal.Idealy,this condition should offer the same output voltage that a input of 3.5 V gives or 3V gives(0.5 differential voltage and 3V common mode voltage).

So, the example is trying to say you that the OUTPUT voltage depends by the differential voltage and the common mode voltage.

I hope you understand what it means...elsewhere try to found more about CMRR.

And about the title(longitudinal conversion): This parameter is important for all balanced systems to reduce the influence of common-mode voltages towards ground, caused by e.g. external interference fields.Also the electrical imbalance of the power network can be measured in terms of the longitudinal conversion loss (LCL), which is defined as the ratio differential mode (DM) signal injected into a power network to CM signal resulted from the power network imbalance.

Have a nice day