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

Claim 18:
19. The method of claim 9, wherein forming the diaphragm wafer further comprises:
depositing a first insulation layer on a first side of the diaphragm wafer;
depositing a polysilicon layer on the first insulation layer;
patterning the polysilicon layer;
depositing a contact metal layer on the polysilicon layer and the first insulation layer;
patterning the contact metal layer;
depositing a second insulation layer on the contact metal layer, the polysilicon layer, and the first insulation layer;
depositing a third insulation layer on a second side of the diaphragm wafer that is opposite the first side; and
etching the second cavity into the second side of the diaphragm.