Since you are using 20 MHz OSC; Fosc/32 could be the solution as it helped me solve a similar problem I had (with 50uS sampling time).
Since you had good result with 300uS sampling time, with Fosc/32 you should be having much better result.
Could you also post the filter schematic? I would like to get some ideas how others design a filter in these types of issues.
---------------------
Last edited by sayzer; - 21st April 2006 at 07:44.
"If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
Bookmarks