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

Claim 7:
8. A method of fabricating a microelectromechanical system (MEMS) strain gauge pressure sensor, the method comprising:
forming a wafer stack, the wafer stack including a first wafer, a second wafer on top of the first wafer, a third wafer on top of the second wafer, and a fourth wafer on top of the third wafer;
dicing the wafer stack into bars by dicing the wafer stack perpendicularly to the first, second, third, and fourth wafers to expose ends of contact metal layers, each bar comprising:
a first side with exposed ends of the contact metal layers; and
a second side opposite the first side;

assembling the bars into a sheet with a first side corresponding to the first sides of the bars and a second side corresponding to the second sides of the bars;
depositing an insulation layer onto the first side of the sheet;
etching the insulation layer to create contact vias;
depositing contact pads onto the contact vias;
dicing the bars parallel to the second sides of the bars to expose channel openings;
depositing a bonding material onto the bars adjacent the channel openings;
bonding pedestals to the bonding material; and
dicing the bars into individual MEMS strain gauge pressure sensors, wherein each individual MEMS strain gauge pressure sensor has the structure as described in claim 1.