Is the oscillation of LM1875 depending on the PCB trace length?

Hi,

For various gain clone-like circuits it is noted that I should use an as short as possible feedback loop to prevent oscillation. In my case I have an LM1875 (20W AUDIO POWER AMPLIFIER DATASHEET:http://www.kynix.com/uploadfiles/pdf2286/LM1875T.pdf)and the application note suggests to put some filter capacitors as close as possible to the supply pins. When I do this I get an awkward PCB layout but when I look at the example layout in the application note the designer was pretty lenient about the 'as close as possible' bit yielding an overall much nicer looking layout.

Is the oscillation mechanism that is to be prevented in the feedback loop and near the supply pins the same? Is it caused by the trace capacitance and/or impedance or something different? I'm interested in a formula that roughly models this effect so I can get a feel for what happens with for example trace lengths of 1, 10, 100 mm respectively.

For all of my LM3886 and LM1875 designs I keep 1uF 50v mono caps as close as possible to its power pins to get best high freq stability and then you can have and 1" or 2" travel to the local storage and decoupling electro caps to stop any low freq motor boating instability problems. The tracks will act as inductors at high frequency causing the high frequency instability. The 1uF mono caps will stop this and guarantee stability over a long life span. Just make the power tracks as wide and as short as possible or use thicker copper.