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5 条记录 (耗时 0.009 秒)

    ARRANGEMENT TO CALIBRATE A CAPACITIVE SENSOR INTERFACE
    1.
    发明公开
    ARRANGEMENT TO CALIBRATE A CAPACITIVE SENSOR INTERFACE 审中-公开

    公开(公告)号：EP3379204A1

    公开(公告)日：2018-09-26

    申请号：EP17162320.0

    申请日：2017-03-22

    申请人： ams International AG

    发明人： Steele, Colin ,  Blattmann, René ,  Christen, Thomas ,  Niederberger, Mark

    IPC分类号： G01D5/24

    CPC分类号： G01D5/24

    摘要： An arrangement (2) to calibrate a capacitive sensor interface (1) comprises a capacitive sensor (10) having a capacitance (cmem, cmemsp, cmemsm) and a charge storing circuit (20) having a changeable capacitance (cdum, cdump, cdumm). A test circuit (30) applies a test signal (vtst) to the capacitive sensor (10) and the charge storing circuit (20). An amplifier circuit (40) has a first input connection (E40a) coupled to the capacitive sensor (10) and a second input connection (E40b) coupled to the charge storing circuit (20). The amplifier circuit (40) provides an output signal (Vout) in dependence on a first input signal (ΔVerr1) applied to the first input connection (E40a) and a second input signal (ΔVerr2) applied to the second input connection (E40b). A control circuit (60) is configured to trim the capacitance (cdum, cdump, cdumm) of the charge storing circuit (20) such that the level of the output signal (Vout) tends to the level of zero.

    MICROPHONE AND METHOD OF TESTING A MICROPHONE
    3.
    发明公开
    MICROPHONE AND METHOD OF TESTING A MICROPHONE 审中-公开

    公开(公告)号：EP3376778A1

    公开(公告)日：2018-09-19

    申请号：EP17160562.9

    申请日：2017-03-13

    申请人： ams International AG

    发明人： Niederberger, Mark

    IPC分类号： H04R19/00 ,  H04R29/00

    摘要： The microphone comprises a housing (1, 2), which has an inner volume (12) filled with a gas, an opening (10) of the housing, an acoustic sensor (3) arranged in the housing, a diaphragm (13) of the acoustic sensor located above the opening, and a heater (14) in the inner volume. The acoustic sensor may especially comprise a microelectromechanical system. The gas is heated from inside the inner volume to increase the pressure and generate a corresponding signal of the acoustic sensor (3). This signal can be used for self-calibration of the sensitivity or for self-diagnostics to check the function of the microphone.