知搜-全球专利检索

  1. 登录
  2. 注册
发明授权
CN106208976B 用于电容声换能器的差分放大器电路和对应的电容声换能器 有权

用于电容声换能器的差分放大器电路和对应的电容声换能器
摘要：
公开了一种用于电容声换能器的放大器电路，该电容声换能器定义根据声信号生成感应信号的感应电容器，该放大器电路具有第一输入端子和第二输入端子，其被耦合到感应电容器和虚拟电容器，该虚拟电容器具有与在待工中的感应电容器的相应的电容对应的电容以及被连接到第一输入端子的第一端子；第一缓冲放大器，其在输入处被耦合到第二输入端子并且定义电路的第一差分输出；第二缓冲放大器，其在输入处被耦合到虚拟电容器的第二端子并且定义电路的第二差分输出；以及反馈级，其被耦合在差分输出与第一输入端子之间，以用于将反馈信号反馈到第一输入端子上，该反馈信号具有取决于所述感应信号的幅度并且相对于所述感应信号相位相反。
摘要（英）：

An amplifier circuit, for a capacitive acoustic transducer defining a sensing capacitor that generates a sensing signal as a function of an acoustic signal, has a first input terminal and a second input terminal, which are coupled to the sensing capacitor and: a dummy capacitor, which has a capacitance corresponding to a capacitance at rest of the sensing capacitor and a first terminal connected to the first input terminal; a first buffer amplifier, which is coupled at input to the second input terminal and defines a first differential output of the circuit; a second buffer amplifier, which is coupled at input to a second terminal of the dummy capacitor and defines a second differential output of the circuit; and a feedback stage, which is coupled between the differential outputs and the first input terminal, for feeding back onto the first input terminal a feedback signal, which has an amplitude that is a function of the sensing signal and is in phase opposition with respect thereto.

公开/授权文献
0/0