Cracked it...
In my perpetual pursuit of _smoothly_ splicing PWL segments for Spice Behavioral Models I always had some fine bumps in the derivatives which might cause feedback loops.
But now I've solved it, working backwards from derivative being a TANH form...
(I can adjust the "fillet" to suit my whims ;-) ...Jim Thompson
-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at
formatting link
| 1962 | I love to cook with wine. Sometimes I even put it in the food.