Shadders
Newbie level 5
Hi,
Not sure if this is the correct subforum.
If we have a CMOS discrete logic circuit being used to transmit unipolar signals at 18Mbits/s along a 75ohm coaxial, 1metre in length, to a correctly terminated BNC, then there will be no reflections.
If we assume that the coaxial cable has been modified with lumped inductors - ferrites, multiple along the length, then the theory is that the coaxial impedance is not modified, but i have used double screened coaxial cables coiled about 6 times, and analogue video showed severe self interference.
As such, the screening is not perfect, and the multiple lumped elements/ferrites will create changes in characteristic impedance multiple times along the cable.
This will cause reflections, and a distorted signal at the receiver.
The question is, will the reflections cause any degradation in the transmitting end (CMOS discrete logic output) over time ?
Thanks and regards,
Shadders.
Not sure if this is the correct subforum.
If we have a CMOS discrete logic circuit being used to transmit unipolar signals at 18Mbits/s along a 75ohm coaxial, 1metre in length, to a correctly terminated BNC, then there will be no reflections.
If we assume that the coaxial cable has been modified with lumped inductors - ferrites, multiple along the length, then the theory is that the coaxial impedance is not modified, but i have used double screened coaxial cables coiled about 6 times, and analogue video showed severe self interference.
As such, the screening is not perfect, and the multiple lumped elements/ferrites will create changes in characteristic impedance multiple times along the cable.
This will cause reflections, and a distorted signal at the receiver.
The question is, will the reflections cause any degradation in the transmitting end (CMOS discrete logic output) over time ?
Thanks and regards,
Shadders.
