Patent ID: 11879800
Assignee: ROSEMOUNT AEROSPACE INC.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 8:
9. A method of fabricating a microelectromechanical system (MEMS) strain gauge pressure sensor, the method comprising:
forming a top wafer stack having a top surface and defining a first cavity;
forming a backing wafer having a bottom surface;
forming a diaphragm wafer defining a second cavity, the diaphragm wafer comprising:
a diaphragm configured to deflect from a difference in pressure; and
a resistor positioned on the diaphragm to sense a deflection of the diaphragm;

bonding the top wafer stack to the diaphragm wafer and bonding the diaphragm wafer to the backing wafer to form a full wafer stack, such that the diaphragm wafer is positioned between the top wafer stack and the backing wafer, the diaphragm is positioned between the first cavity and the second cavity, and the top surface is opposite the bottom surface; and
attaching a pedestal laterally to the top wafer stack, the backing wafer, and the diaphragm wafer;
wherein the MEMS strain gauge pressure sensor has a central axis that is parallel to the top surface and the bottom surface such that the MEMS strain gauge pressure sensor has mechanical symmetries about the central axis.