Patent ID: 11946816
Assignee: NEXTINPUT, INC.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A method for manufacturing a microelectromechanical (“MEMS”) force sensor, comprising:
forming a piezoelectric sensing element on a surface of a first substrate;
forming a piezoresistive sensing element and digital circuitry on a surface of a second substrate;
bonding the first substrate and the second substrate to form a sensor die;
etching the first substrate and at least a portion of the second substrate to form a through hole; and
creating an electrical connection between the piezoelectric sensing element formed on the first substrate and the digital circuitry formed on the second substrate via the through hole, wherein creating the electrical connection between the piezoelectric sensing element formed on the first substrate and the digital circuitry formed on the second substrate via the through hole further comprises:
depositing an isolation/barrier layer on at least a portion of a surface of the sensor die;
depositing a metal layer on at least a portion of a surface of the isolation/barrier layer;
depositing a polymer layer on the sensor die, wherein the polymer layer covers the isolation/barrier layer and the metal layer; and
etching the polymer layer to form an under bump metallization (UBM) layer; and

depositing a second metal layer on the UBM layer.