IGFET device having a RF capability

A IGFET device comprising:

• a semiconductor body having a major surface,
• a source region of first conductivity type abutting said surface,
• a drain region of said first conductivity-type abutting said surface and spaced from said source region with a channel therefrom,
• an active gate overlying said channel and insulated from the channel by a first dielectric material forming the gate oxide of the IGFET device,
• a dummy gate is positioned between said active gate and said drain region and is insulated from the active gate by a second dielectric material so that a capacitance is formed between the active gate and the dummy gate, and is insulated from the drain region by said gate oxide, wherein
• the active gate and the dummy gate forming the electrodes of said capacitance are disposed substantially perpendicular to said surface, and wherein the second dielectric material completely covers an entire top surface of the dummy gate, and
• wherein an opening is disposed through the second dielectric material to the active gate.