pulse transformer design

Hi

I′m looking for formulae for high frecuency response of a pot core wideband transformer; more exactly how to calculate the transforme model capacitances.

Thanks

http://www.midcom-inc.com/pdf/tn82.pdf
http://www.rhombus-ind.com/app-note/circuit.pdf
http://www.rhombus-ind.com/app-note/appnote.html
http://www.reed-electronics.com/ednm...le/CA46932?1=1

Pls go to ti power supply seminar,that have much transformer design and application article,all are very classic:
http://focus.ti.com/analog/docs/****...74&familyId=64