发明名称 |
COMBINED MEMS ACCELEROMETER AND GYROSCOPE |
摘要 |
A MEMS structure for a combined gyroscope and accelerometer unit (100) based on in-plane vibratory movements comprises a proof mass (101) and comb-drives (102) operable to cause the proof mass (101) to resonate in the x-direction, commonly referred to as the primary mode. Under the influence of a rotation Oz around the z- axis, a Coriolis force acting in the y-direction results. This excites the secondary (or sense) mode. A set of parallel-plate capacitors 103 are provided to enable position readout along the secondary axis. In addition to the above, the comb-drive capacitors (102) of the primary mode can also be used for readout of position along the primary axis, and the parallel-plate capacitors (103) for actuation along the secondary axis. This can be achieved either by time-multiplexing these capacitors (102, 103) or by providing separate sets of capacitors (102, 103) for sensing and actuation along each axis. The unit can operate in separate S? force-feedback loops with respect to both axes. This force-feedback approach is already known for readout of the secondary mode of MEMS gyroscopes. It has not previously been applied to the primary mode of a gyroscope for the measurement of a component of acceleration. |
申请公布号 |
WO2009050578(A3) |
申请公布日期 |
2009.06.04 |
申请号 |
WO2008IB02798 |
申请日期 |
2008.10.20 |
申请人 |
MELEXIS NV;UNIVERSITEIT GENT;RAMAN, JOHAN;ROMBOUTS, PIETER |
发明人 |
RAMAN, JOHAN;ROMBOUTS, PIETER |
分类号 |
G01C19/56;G01C19/5755;G01P15/14;G01P15/18 |
主分类号 |
G01C19/56 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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