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    • 7. 发明授权
    • Variable capacitance device
    • 可变电容器件
    • US09224536B2
    • 2015-12-29
    • US13568172
    • 2012-08-07
    • Akira KumadaTeruhisa ShibaharaKenji Tanaka
    • Akira KumadaTeruhisa ShibaharaKenji Tanaka
    • H01G5/00H01G7/00H01G7/06H01H57/00G01R27/26H01G5/16H03J3/20
    • H01G5/16H03J3/20H03J2200/19
    • 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.
    • 即使产生导致变化的电容的因素,实现期望的电容的可变电容器件被配置为使得电容检测脉冲信号从电容检测信号生成单元施加到MEMS机械单元的驱动电容器和参考电容器。 基于电容检测信号的驱动电容器的器件电压和驱动电压被施加到比较器的反相输入端。 基于电容检测信号和驱动电压的参考电容器的器件电压被施加到比较器的非反相输入端。 比较器从这些器件电压之间的差产生包括“Hi”和“Low”值的比较输出信号,并将输出信号施加到驱动电压产生单元。 驱动电压产生单元根据比较输出信号来增大或减小驱动电压。