guide lines

Transition capacitance

The decrease in uncovered charges with applied voltage may be considered as a capacitive effect,which may be reffered as transition capacitance or space charge capacitance.It can be Ct=|dQ/dV| ,This Ct is not constant but depends on the magnitude of reverse voltage.the value of transition capacitance can be given by,Ct=E*a/Wp,In case of ofrward bias it is very low and hense not considered. Larger the reverse bias voltage,larger is the space charge width and smaller the capacitance Ct. Similarly,for increase in forward bias voltage bandwidth will decrease and W decreases and Ct will increase.