The performance of my self-made JTAG cable isn't great, I can clock it up to 1.5Mhz max. I've read that terminating the clock line is a thing so I investigated:
One solution suggested to add a series termination resistor of 220 Ohm (or so).. Haven't tried that yet, but it makes sense.
Another solution recommended this:
That makes perfect sense to me. It's like ordinary termination with a high-pass built in.
Something makes me wonder however:
The capacitor isolates from the actual DC level, so it should not matter if I connect it to ground, 1V, 10V or whatever as long as 'whatever' is of low impedance, right?
Could I connect the capacitor to - lets say - my 3.3V CPU supply instead of ground or is that a terrible idea?
Reason I ask is, that on my cable the clock line is directly beside the 3.3V so decoupling against that reference would fit better.