My question is related to an increase in voltage at the end of a “transmission line”.
First, I don’t want to confuse you. There are 2 signals that are referred to in the attached schematics.
A “W” beam signal and a “N” beam signal.
The circuits for each of them are identical.
The same problem appears on both signal lines.
I will refer to only one of them.
The driver is a TI THS6012IDWP (lower right).
The voltage measured between the WBEAM_WF High and Low is 10 Vpp/Sine wave at about 160 kHz.
The receiver is a TI OPA37GU (upper left).
The voltage measured between the TS_IN_WB High and Low is 16 Vpp.
Between the driver and receiver there is about 360 feet of twisted shielded cable.
Here are my questions:
1. What is causing this “phenomena”?
2. I am not an electronics engineer. So, is there some sort of an analysis that can be performed that reflects the measurements noted above?
3. What can be done in the electronic design to ensure that a 10 Vpp signal at the driver output will provide a 10 Vpp signal at the receiver input?