You might enjoy this ground-breaking scientific paper. <http://3dpancakes.typepad.com/ernie/2007/05/chicken_chicken.html> -- Keith Lofstrom keithl at keithl.com Voice (503)-520-1993 KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon" Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs