In a design I'm working on, I have a 100Mbps differential signal traveling from a chip on one PCB to a chip on another PCB. For various reasons, I can't make the differential impedance the same on both boards.
Looking at the signal on a 'scope, I can see that the waveform looks quite bad, presumably due to reflections at the change of impedance.
Is there a component I can use to help the signal cross this impedance change without reflecting?
My thought was that either a balun or an LVDS repeater might do the job.
Alternatively, could I replace the parallel termination resistor at the end of the line with a series termination at the start of the line? This would absorb reflections coming back from the impedance changes (but obviously wouldn't do anything for double reflections, although those should be much weaker arriving at the end).
