Abstract:
Un microsystème électromécanique comprend une poutre (1) et une électrode (10) couplée par une interaction électrostatique avec la poutre. La poutre est adaptée pour subir des déformations élastiques par flexion et possède un motif de section sensiblement constant. La poutre (1) est constituée de plusieurs pans (P1-P4) s'étendant sur la longueur de la poutre (L), et ayant chacun une épaisseur inférieure à une dimension extérieure du motif de section (w, t). Une fréquence de vibration par flexion de la poutre est alors accrue par rapport à une poutre pleine de mêmes dimensions extérieures. Un tel microsystème est adapté pour des applications à durées de transition très courtes, ou pour réaliser des oscillateurs et des résonateurs à haute fréquence.
Abstract:
A method of manufacturing a MEMS structure including forming a porous layer having a predetermined thickness on the top surface of a substrate over an area where a cavity is to be formed; forming the cavity by etching the substrate below the porous layer; forming a membrane layer on the top surface to seal the cavity; and forming a structure on the upper side of the membrane layer. After forming a cantilever structure on the membrane layer and etching the membrane layer, a cantilever structure is produced in a floating state over the cavity. Also, at least one inlet hole and outlet hole can be formed in the porous layer and the membrane, thereby providing a sealed fluidic channel.
Abstract:
A new bulk resonator may be fabricated by a process that is readily incorporated in the traditional fabrication techniques used in the fabrication of monolithic integrated circuits on a wafer. The resonator is decoupled from the wafer by a cavity etched under the resonator using selective etching through front openings (vias) in a resonator membrane. In a typical structure the resonator is formed over a silicon wafer by first forming a first electrode, coating a piezoelectric layer over both the electrode and the wafer surface and forming a second electrode opposite the first on the surface of the piezoelectric layer. After this structure is complete, a number of vias are etched in the piezoelectric layer exposing the surface under the piezoelectric layer to a selective etching process that selectively attacks the surface below the piezoelectric layer creating a cavity under the resonator.
Abstract:
Various embodiments may provide a device arrangement. The device arrangement may include a substrate including a conductive layer. The device arrangement may further include a microelectromechanical systems (MEMS) device monolithically integrated with the substrate, wherein the MEMS device may be electrically coupled to the conductive layer. A cavity may be defined through the conductive layer for acoustically isolating the MEMS device from the substrate. At least one anchor structure may be defined by the conductive layer to support the MEMS device.
Abstract:
Es wird eine Abdeckung (1) für ein elektronisches Bauelement (z.B. vom Typ MEMS, BAW oder SAW) angegeben. Die Abdeckung umfasst wenigstens eine Schicht (5, 6, 7), die eine Strukturierung (19, 20, 21) mit mehreren Erhebungen (8, 9, 15) und/oder Vertiefungen (10, 11, 16) aufweist. Zudem wird ein Verfahren zur Herstellung einer derartigen Abdeckung (1) angegeben.
Abstract:
Micromachined ultrasonic transducers formed in complementary metal oxide semiconductor (CMOS) wafers are described, as are methods of fabricating such devices. A metallization layer of a CMOS wafer may be removed by sacrificial release to create a cavity of an ultrasonic transducer. Remaining layers may form a membrane of the ultrasonic transducer.
Abstract:
The invention provides systems and methods for producing a chip comprising a radio-frequency filter which is based on MEMS and is arranged inside an integrated circuit. In one aspect, the systems and methods provide a chip which includes electronic elements formed on a substrate made of semiconductor material. The chip additionally includes an interconnection layer stack which includes layers of conductive material which are separated by layers of dielectric material. A radio-frequency filter is formed inside the interconnection layer stack by applying gaseous HF to the interconnection layers. The radio-frequency filter includes a plurality of resonator elements which are mechanically decoupled.