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公开(公告)号：EP0270192A2
公开(公告)日：1988-06-08
申请号：EP87202389.0
申请日：1987-12-02
CPC分类号： H03H19/004 , H03H11/126
摘要： A filter comprises an amplifier circuit arrangement having a signal input (1) and a signal output (8) and a coupling (36) between a point (37) on a signal path (39) to the signal input and a point (38) on a signal path from the signal output. The amplifier circuit arrangement comprises an inverting amplifier (6) to the input (5) of which the signal an input (1) is connected via a series impedance (7), e.g. a resistor. A feedback impedance (9), e.g. a capacitor, connects the amplifier output (8) to its input (5) so that this input constitutes a virtual earth. The phase relationship between the input and output signals of such an arrangement changes from inverting to non-inverting at frequencies at which the gain of the amplifier drops to below unity, because of forward feed through the feedback impedance (9), thereby upsetting the phase relationship between the signals passing through the arrangement and those passing through the coupling. Accordingly a further impedance (10), e.g. a capacitance, is provided between the common point (11) of the series and feedback impedances and ground. At frequencies at which the amplifier gain is high this has virtually no effect, because of the virtual earth existing at the common point (11). However, at frequencies at which the amplifier gain drops to unity or below the virtual earth effect is lost and the further impedance forms a potential divider with the series impedance (7), reducing the proportion of the input signal which can take the direct forward path through the feedback impedance.
摘要翻译： 滤波器包括具有信号输入（1）和信号输出（8）的放大器电路装置和信号路径（39）上的信号输入端（38）和点（38）之间的耦合（36） 在信号输出的信号路径上。 放大器电路装置包括到输入端（5）的反相放大器（6），输入端（5）的信号通过串联阻抗（7）连接到输入端（1）。 一个电阻 反馈阻抗（9），例如 电容器将放大器输出（8）连接到其输入（5），使得该输入构成虚拟地球。 这种布置的输入和输出信号之间的相位关系由于通过反馈阻抗（9）的正向馈送而由放大器的增益下降到低于1的频率处从反相变为非反相，从而使相位失真 通过布置的信号与通过耦合的信号之间的关系。 因此，进一步的阻抗（10），例如 在串联的公共点（11）和反馈阻抗和接地之间提供电容。 在放大器增益高的频率下，由于虚拟地线存在于公共点（11），所以实际上没有任何影响。 然而，在放大器增益下降到单位或低于虚拟地球效应的频率处，并且阻抗形成具有串联阻抗（7）的分压器，从而减小可以采用直接正向路径的输入信号的比例 通过反馈阻抗。
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公开(公告)号：EP0270192A3
公开(公告)日：1989-05-10
申请号：EP87202389.0
申请日：1987-12-02
CPC分类号： H03H19/004 , H03H11/126
摘要： A filter comprises an amplifier circuit arrangement having a signal input (1) and a signal output (8) and a coupling (36) between a point (37) on a signal path (39) to the signal input and a point (38) on a signal path from the signal output. The amplifier circuit arrangement comprises an inverting amplifier (6) to the input (5) of which the signal an input (1) is connected via a series impedance (7), e.g. a resistor. A feedback impedance (9), e.g. a capacitor, connects the amplifier output (8) to its input (5) so that this input constitutes a virtual earth. The phase relationship between the input and output signals of such an arrangement changes from inverting to non-inverting at frequencies at which the gain of the amplifier drops to below unity, because of forward feed through the feedback impedance (9), thereby upsetting the phase relationship between the signals passing through the arrangement and those passing through the coupling. Accordingly a further impedance (10), e.g. a capacitance, is provided between the common point (11) of the series and feedback impedances and ground. At frequencies at which the amplifier gain is high this has virtually no effect, because of the virtual earth existing at the common point (11). However, at frequencies at which the amplifier gain drops to unity or below the virtual earth effect is lost and the further impedance forms a potential divider with the series impedance (7), reducing the proportion of the input signal which can take the direct forward path through the feedback impedance.
摘要翻译： 滤波器包括具有信号输入（1）和信号输出（8）的放大器电路装置和信号路径（39）上的信号输入端（38）和点（38）之间的耦合（36） 在信号输出的信号路径上。 放大器电路装置包括到输入端（5）的反相放大器（6），输入端（5）的信号通过串联阻抗（7）连接到输入端（1）。 一个电阻 反馈阻抗（9），例如 电容器将放大器输出（8）连接到其输入（5），使得该输入构成虚拟地球。 这种布置的输入和输出信号之间的相位关系由于通过反馈阻抗（9）的正向馈送而由放大器的增益下降到低于1的频率处从反相变为非反相，从而使相位失真 通过布置的信号与通过耦合的信号之间的关系。 因此，进一步的阻抗（10），例如 在串联的公共点（11）和反馈阻抗和接地之间提供电容。 在放大器增益高的频率下，由于虚拟地线存在于公共点（11），所以实际上没有任何影响。 然而，在放大器增益下降到单位或低于虚拟地球效应的频率处，并且阻抗形成具有串联阻抗（7）的分压器，从而减小可以采用直接正向路径的输入信号的比例 通过反馈阻抗。
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