Patent ID: 7019384

Claim:
An integrated, tunable capacitance device, comprising: a semiconductor body having a semiconductor region of a first conductivity type, said semiconductor region having a terminal region for applying a tuning voltage; at least one first insulating region being introduced into said semiconductor body and having a first layer thickness; a second insulating region applied to said semiconductor body adjoining said at least one first insulating region and having a common interface with said semiconductor region, said second insulating region having a second layer thickness less than said first layer thickness; a gate electrode on said second insulating region, said semiconductor region having a partial region disposed below said gate electrode, said at least one first insulating region being disposed between said terminal region and said partial region; and a region being introduced into said semiconductor body for connection to a reference-ground potential, said region adjoining said semiconductor region, being of a second conductivity type, and being highly doped, said semiconductor region below said second insulating region under said gate electrode being linked to said region of said second conductivity type and thus to the reference-ground potential to improve a quality factor.