Invention Grant
- Patent Title: CSOI MEMS pressure sensing element with stress equalizers
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Application No.: US16123367Application Date: 2018-09-06
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Publication No.: US11029227B2Publication Date: 2021-06-08
- Inventor: Jen-Huang Albert Chiou , Shiuh-Hui Steven Chen
- Applicant: Continental Automotive Systems, Inc.
- Applicant Address: US MI Auburn Hills
- Assignee: Continental Automotive Systems, Inc.
- Current Assignee: Continental Automotive Systems, Inc.
- Current Assignee Address: US MI Auburn Hills
- Main IPC: G01L9/00
- IPC: G01L9/00 ; G01L9/06

Abstract:
A pressure sensing element includes a supporting substrate including a cavity. A device layer is bonded to the supporting substrate, with a diaphragm of the device layer covering the cavity in a sealed manner. A plurality of piezoresistors is coupled to the diaphragm. A plurality of metal stress equalizers is disposed on the device layer such that each stress equalizer is generally adjacent to, but separated from, a corresponding piezoresistor. A plurality of metal bond pads is disposed on the device layer. The plurality of stress equalizers are constructed and arranged to reduce thermal hysteresis of the pressure sensing element caused by stress relaxation of the metal bond pads during a cooling and heating cycle of the pressure sensing element.
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