发明名称 |
VARIABLE CAPACITANCE DEVICE |
摘要 |
A variable capacitance device that achieves a desired capacitance even when factors causing varied capacitances are generated is configured such that a capacitance detection pulse signal is applied from a capacitance detection signal generation unit to a driving capacitor and a reference capacitor of a MEMS mechanical unit. The device voltage of the driving capacitor based on the capacitance detection signal and a driving voltage is applied to the inverting input terminal of a comparator. The device voltage of the reference capacitor based on the capacitance detection signal and the driving voltage is applied to the non-inverting input terminal of the comparator. The comparator generates a comparison output signal including "Hi" and "Low" values from the difference between these device voltages, and applies the output signal to a driving voltage generation unit. The driving voltage generation unit increases or decreases the driving voltage based on the comparison output signal.
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申请公布号 |
US2013201599(A1) |
申请公布日期 |
2013.08.08 |
申请号 |
US201213568172 |
申请日期 |
2012.08.07 |
申请人 |
KUMADA AKIRA;SHIBAHARA TERUHISA;TANAKA KENJI;MURATA MANUFACTURING CO., LTD. |
发明人 |
KUMADA AKIRA;SHIBAHARA TERUHISA;TANAKA KENJI |
分类号 |
H01G5/16 |
主分类号 |
H01G5/16 |
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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