发明授权
US09176020B2 Pressure sensor having multiple pressure cells and sensitivity estimation methodology
有权
压力传感器具有多个压力传感器和灵敏度估算方法
- 专利标题: Pressure sensor having multiple pressure cells and sensitivity estimation methodology
- 专利标题(中): 压力传感器具有多个压力传感器和灵敏度估算方法
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申请号: US14043556申请日: 2013-10-01
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公开(公告)号: US09176020B2公开(公告)日: 2015-11-03
- 发明人: Chad S. Dawson , Peter T. Jones
- 申请人: FREESCALE SEMICONDUCTOR, INC.
- 申请人地址: US TX Austin
- 专利权人: FREESCALE SEMICONDUCTOR, INC.
- 当前专利权人: FREESCALE SEMICONDUCTOR, INC.
- 当前专利权人地址: US TX Austin
- 主分类号: G01L1/12
- IPC分类号: G01L1/12 ; G01L25/00 ; G01L1/04 ; G01L1/14
摘要:
A pressure sensor (20) includes a test cell (32) and sense cell (34). The sense cell (34) includes an electrode (42) formed on a substrate (30) and a sense diaphragm (68) spaced apart from the electrode (42) to produce a sense cavity (64). The test cell (32) includes an electrode (40) formed on the substrate (30) and a test diaphragm (70) spaced apart from the electrode (40) to produce a test cavity (66). Both of the cells (32, 34) are sensitive to pressure (36). However, a critical dimension (76) of the sense diaphragm (68) is less than a critical dimension (80) of the test diaphragm (70) so that the test cell (32) has greater sensitivity (142) to pressure (36) than the sense cell (34). Parameters (100) measured at the test cell (32) are utilized to estimate a sensitivity (138) of the sense cell (34).
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