Hello, i am currently studying oscilloscopes, specifically probe-design. My first hurdle so far seems to be the working principles of a coaxial cable. Long story short, i had to go back and refresh my memory regarding induction, skin-effect, capacitance, etc.
Now for my question:
The idea i have always had about induction and counter-electromotive force (back-EMF), is based on the fact that an alternating current changes direction. Now what i haven't really thought of before is high frequency digital signals, square waves. Usually these signals are 0 - 5/3.3 V so the current will always go one direction (DC) as it never goes below 0 V. Since it does not change direction; how can a back-EMF be produced, which is an absolute necessary event for skin-effect to occur?
I read that a varying intensity in current, which in turn makes a varying intensity in the magnetic field, is enough to produce a back-EMF but i don't understand how that is. I have always thought that the magnetic field as to go in reversed direction in order to produce a reversed induced current.
Any answers appreciated.
Now for my question:
The idea i have always had about induction and counter-electromotive force (back-EMF), is based on the fact that an alternating current changes direction. Now what i haven't really thought of before is high frequency digital signals, square waves. Usually these signals are 0 - 5/3.3 V so the current will always go one direction (DC) as it never goes below 0 V. Since it does not change direction; how can a back-EMF be produced, which is an absolute necessary event for skin-effect to occur?
I read that a varying intensity in current, which in turn makes a varying intensity in the magnetic field, is enough to produce a back-EMF but i don't understand how that is. I have always thought that the magnetic field as to go in reversed direction in order to produce a reversed induced current.
Any answers appreciated.