公开(公告)号：WO2009136198A2

公开(公告)日：2009-11-12

申请号：PCT/GB2009/050476

申请日：2009-05-07

Applicant: WOLFSON MICROELECTRONICS PLC ,  STEELE, Colin Findlay ,  STOJANOVIC, Goran ,  LESSO, John Paul

Inventor： STEELE, Colin Findlay ,  STOJANOVIC, Goran ,  LESSO, John Paul

CPC classification number: G01D5/24 ,  G01D3/032 ,  H04R3/00 ,  H04R19/005 ,  H04R19/04

Abstract: A capacitive transducer circuit comprises a capacitive transducer having first and second electrodes. The first and second electrodes are biased by respective first and second bias voltages. An amplifier is connected to receive a first analogue signal on an input terminal, the first analogue signal being generated by the capacitive transducer, and to generate a second analogue signal on an output terminal. A digital feedback circuit is connected between the output terminal of the amplifier and the input terminal of the amplifier. The digital feedback circuit is configured to provide one of said first or second bias voltages. The output of a voltage source which provides the other bias voltage for the capacitive transducer may be filtered by a low pass filter. The low pass filter may comprise a switched capacitor filter circuit.

Abstract translation: 电容式换能器电路包括具有第一和第二电极的电容换能器。 第一和第二电极被相应的第一和第二偏置电压偏置。 放大器被连接以在输入端子上接收第一模拟信号，第一模拟信号由电容换能器产生，并在输出端产生第二模拟信号。 数字反馈电路连接在放大器的输出端和放大器的输入端之间。 数字反馈电路被配置为提供所述第一或第二偏置电压之一。 提供电容换能器的另一个偏置电压的电压源的输出可以被低通滤波器滤波。 低通滤波器可以包括开关电容滤波器电路。

公开(公告)号：WO2009136198A3

公开(公告)日：2010-07-15

申请号：PCT/GB2009050476

申请日：2009-05-07

Applicant: WOLFSON MICROELECTRONICS PLC ,  STEELE COLIN FINDLAY ,  STOJANOVIC GORAN ,  LESSO JOHN PAUL

Inventor： STEELE COLIN FINDLAY ,  STOJANOVIC GORAN ,  LESSO JOHN PAUL

IPC: G01D5/24 ,  H04R3/06

CPC classification number: G01D5/24 ,  G01D3/032 ,  H04R3/00 ,  H04R19/005 ,  H04R19/04

Abstract: A capacitive transducer circuit comprises a capacitive transducer having first and second electrodes. The first and second electrodes are biased by respective first and second bias voltages. An amplifier is connected to receive a first analogue signal on an input terminal, the first analogue signal being generated by the capacitive transducer, and to generate a second analogue signal on an output terminal. A digital feedback circuit is connected between the output terminal of the amplifier and the input terminal of the amplifier. The digital feedback circuit is configured to provide one of said first or second bias voltages. The output of a voltage source which provides the other bias voltage for the capacitive transducer may be filtered by a low pass filter. The low pass filter may comprise a switched capacitor filter circuit.

Abstract translation: 电容式换能器电路包括具有第一和第二电极的电容换能器。 第一和第二电极被相应的第一和第二偏置电压偏置。 放大器被连接以在输入端子上接收第一模拟信号，第一模拟信号由电容换能器产生，并在输出端产生第二模拟信号。 数字反馈电路连接在放大器的输出端和放大器的输入端之间。 数字反馈电路被配置为提供所述第一或第二偏置电压之一。 提供电容换能器的另一个偏置电压的电压源的输出可以被低通滤波器滤波。 低通滤波器可以包括开关电容滤波器电路。