Hi g(f(e)),

I think that you should carefully note what Jan Didden wrote.

A buss ground is not as good as a single-point "star" ground topology. The goal should be to avoid having ground-return currents sharing any length of conductor.

Every conductor has at least resistance and inductance. So any current flowing through any conductor will induce a voltage distributed along the conductor.

In the case of a ground-return current, we can assume that the conductor's summed distributed current-induced voltage appears back at the non-ground end of the conductor, relative to the "ground" end.

The voltage at the non-ground end of the ground-return conductor will be proportional to both the magnitude of the current (due to the conductor's resistance) AND to the rate-of-change of the magnitude of the current (due to inductance).

A dynamic (i.e. non-DC) return current will cause the voltage at the non-ground end of the ground-return conductor to be changing. This is called "ground bounce". (Note that even a relatively low-magnitude current could induce a relatively large voltage, if the current's magnitude is changing at a fast rate, due to inductance. And, obviously, a large-magnitude dynamic return current will induce a relatively large voltage.)

If the "ground" in question is the reference point for an amplifier input, for example, the ground bounce voltage will be arithmetically added to the signal at the input. Not good.

If two or more ground-return currents share a length of conductor, the current from each place will induce a ground bounce voltage in each of the other places. Not good.

If anyone would like to simulate the effects of shared ground-return conductors, using LTspice, I have some simple schematics which are downloadable, at

http://www.fullnet.com/~tomg/gooteesp.htm . The star ground portions can be copied and pasted into your own simulation schematics. The setup I used makes it easy to share and un-share the ground-return conductors, to see if the effects are significant, etc. [Note that in LTspice, the inductors include a series resistance, which can be edited by right-clicking on an inductor's symbol, on the schematic.]