Question

why differential signal cancels inductance?

thanks

Answer 1

Knowing the basics :

An inductor is an electronic component (passive) which is used to store energy. The storage of energy is in the form of magnetic field. The component consists of a coil in which wires are wound. Hence, the current passing through the coil produces a magnetic field. The direction of the magnetic field is found through Right Hand Thumb rule. This current creates a magnetic flux which in turn creates a voltage which opposes the change of current. Thereby,inducing an emf (electro motive force).

Now, let’s understand the differential signals:

The differential signals carry differential currents which are driven by differential voltages. Hence , these differential currents create opposite magnetic fields ‘B’ which are equal in magnitude in the core of the inductor ( as shown in figure given below). These magnetic fields cancel out each other, resulting in a zero net flux in the core. Hence, the differential signals cancel out inductances as the magnetic flux cancels out eachother.

In figure: - { Hence, cancelling out both induced flux}