Often used to reduce the RC delay in integrated circuits are dielectric films of porous organosilicates which have a silica like backbone with alkyl or aryl groups attached directly to the Si atoms in the network. For example, some embodiments of the present invention provide analog to digital conversion systems. A clamp cover is joined to the upper edge of one U-shaped limb by means of a flexible strip. The datagrams may be exposed in cleartext at the endpoints of each tunnel, thereby enabling security gateways to perform services that require content inspection. A bottom electrode is formed connecting to a corresponding bit line. The coil is inserted between an output end of the umbrella-type element and an input end of the amplifier to make the umbrella-type element resonate at a predetermined frequency, and is disposed substantially at a center in a width direction of the umbrella-type element.