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    • 67. 发明授权
    • Electric circuit for tuning a capacitive electrostatic transducer
    • 用于调谐电容式静电传感器的电路
    • US07670290B2
    • 2010-03-02
    • US10803808
    • 2004-03-17
    • John A. HossackBrett BymasterIgal LadabaumPaul A. WagnerChristopher M. W. Daft
    • John A. HossackBrett BymasterIgal LadabaumPaul A. WagnerChristopher M. W. Daft
    • A61B8/00
    • B06B1/0292A61B8/4483G01S7/52079
    • An electrostatic transducer circuit and method of tuning the same, in which a balancing circuit is inserted into the electrostatic transducer circuit, is described. The electrostatic transducer circuit generally includes transmit circuitry, receive circuitry, a capacitive electrostatic transducer and the balancing circuit. The balancing circuit can include, either singly or in combination, an inductance and a negative capacitance. The balancing inductance is tuned to counteract the negative reactance of the capacitive electrostatic transducer at a desired operating frequency and can be inserted into the transmit circuitry and/or the receive circuitry. The balancing negative capacitance is tuned to counteract the capacitance of the capacitive electrostatic transducer and can be inserted into the receive circuitry and/or the transmit circuitry. The transmit circuitry can be isolated from the receive circuitry, and vice versa, once the balancing circuit has been inserted. Isolation can be achieved by switching the electrostatic transducer circuit between transmit and receive modes of operation, or by providing separate transmit and receive electrode subsets.
    • 描述了一种静电换能器电路及其调谐方法,其中平衡电路插入到静电换能器电路中。 静电换能器电路通常包括发射电路,接收电路,电容式静电变换器和平衡电路。 平衡电路可以单独地或组合地包括电感和负电容。 调整平衡电感以抵消在期望的工作频率下的电容式静电换能器的负电抗并且可以插入到发射电路和/或接收电路中。 调整平衡负电容以抵消电容式静电变换器的电容,并可将其插入接收电路和/或发射电路。 一旦平衡电路被插入,发射电路可以与接收电路隔离,反之亦然。 可以通过在发射和接收工作模式之间切换静电转换器电路,或通过提供单独的发射和接收电极子集来实现隔离。
    • 69. 发明授权
    • Electric circuit for tuning a capactive electrostatic transducer
    • 用于调节主动静电传感器的电路
    • US06726626B1
    • 2004-04-27
    • US10222002
    • 2002-08-14
    • John A. Hossack
    • John A. Hossack
    • A61B800
    • B06B1/0292
    • An electrostatic transducer circuit and method of tuning the same, in which a balancing inductance is inserted into the electrostatic transducer circuit is described. The electrostatic transducer circuit generally includes transmit circuitry, receive circuitry and a capacitive electrostatic transducer. The balancing inductance is tuned to counteract the negative reactance of the capacitive electrostatic transducer at a desired operating frequency during the transmit mode. The balancing inductance is inserted into the transmit circuitry and is then isolated from the remaining parts of the electrostatic transducer circuit. Isolation is achieved by switching the electrostatic transducer circuit between transmit and receive modes of operation. Further, a receive circuit balancing reactance can also be included. The method provides a balancing inductance that is used to counteract negative reactance of the capacitive electrostatic transducer at a desired operating frequency during transmit mode.
    • 描述了静电换能器电路及其调谐方法,其中平衡电感被插入到静电换能器电路中。 静电换能器电路通常包括发射电路,接收电路和电容式静电换能器。 在发射模式期间,调节​​平衡电感以抵消电容性静电换能器在期望工作频率下的负电抗。 平衡电感插入到发射电路中,然后与静电转换器电路的其余部分隔离。 通过在发射和接收操作模式之间切换静电换能器电路实现隔离。 此外,还可以包括接收电路平衡电抗。 该方法提供平衡电感,其用于在发射模式期间以期望的工作频率抵消电容式静电换能器的负电抗。