Abstract:
An integrated circuit includes a substrate member having a surface region and a CMOS IC layer overlying the surface region. The CMOS IC layer has at least one CMOS device. The integrated circuit also includes a bottom isolation layer overlying the CMOS IC layer, a shielding layer overlying a portion of the bottom isolation layer, and a top isolation layer overlying a portion of the bottom isolation layer. The bottom isolation layer includes an isolation region between the top isolation layer and the shielding layer. The integrated circuit also has a MEMS layer overlying the top isolation layer, the shielding layer, and the bottom isolation layer. The MEMS layer includes at least one MEMS structure having at least one movable structure and at least one anchored structure. The at least one anchored structure is coupled to a portion of the top isolation layer, and the at least one movable structure overlies the shielding layer.
Abstract:
A multi-axis integrated MEMS inertial sensor device. The device can include an integrated 3-axis gyroscope and 3-axis accelerometer on a single chip, creating a 6-axis inertial sensor device. The structure is spatially with efficient use of the design area of the chip by adding the accelerometer device to the center of the gyroscope device. The design architecture can be a rectangular or square shape in geometry, which makes use of the whole chip area and maximizes the sensor size in a defined area. The MEMS is centered in the package, which is beneficial to the sensor's temperature performance. Furthermore, the electrical bonding pads of the integrated multi-axis inertial sensor device can be configured in the four corners of the rectangular chip layout. This configuration guarantees design symmetry and efficient use of the chip area.
Abstract:
A method for fabricating a multiple MEMS device includes providing a semiconductor substrate having a first and second MEMS device, and an encapsulation wafer with a first cavity and a second cavity, which includes at least one channel. The first MEMS is encapsulated within the first cavity and the second MEMS device is encapsulated within the second cavity. These devices is encapsulated within a first encapsulation environment at a first air pressure, and encapsulating the first MEMS device within the first cavity at the first air pressure. The second MEMS device within the second cavity is then subjected to a second encapsulating environment at a second air pressure via the channel of the second cavity.
Abstract:
An integrated pressure sensing device and method of fabrication thereof are disclosed. The method can include providing a substrate member having a surface region and forming a CMOS IC layer overlying the substrate and forming an oxide layer overlying the CMOS IC layer. A portion of the oxide layer can be removed to form a cavity region. A single crystalline silicon wafer can be bonded overlying the oxide surface region to seal the cavity region. The bonding process can include a fusion bonding or eutectic bonding process. The wafer can be thinned to a desired thickness and portions can be removed and filled with metal materials to form via structures. A pressure sensor device can be formed from the wafer, and can be co-fabricated with another sensor from the wafer. The pressure sensor and the other sensor can share a cavity pressure or have separate cavity pressures.
Abstract:
An integrated MEMS inertial sensor device. The device includes a MEMS inertial sensor overlying a CMOS substrate. The MEMS inertial sensor includes a drive frame coupled to the surface region via at least one drive spring, a sense mass coupled to the drive frame via at least a sense spring, and a sense electrode disposed underlying the sense mass. The device also includes at least one pair of quadrature cancellation electrodes disposed within a vicinity of the sense electrode, wherein each pair includes an N-electrode and a P-electrode.