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公开(公告)号：US20150303880A1
公开(公告)日：2015-10-22
申请号：US14259120
申请日：2014-04-22
Applicant: MEDIATEK INC.
Inventor： Tzu-Hsuin Peng , Chih-Hong Lou , Chao-Hsin Lu , Chi-Yun Wang , Chih-Jung Chen
CPC classification number: H03F1/26 , H03F3/45475 , H03F3/45479 , H03F3/45932 , H03F2200/129 , H03F2200/267 , H03F2203/45061 , H03F2203/45116 , H03F2203/45138 , H03F2203/45526 , H03H11/0405 , H03H11/1217 , H03H11/1234
Abstract: A low pass filter includes a first amplifier stage and a second amplifier stage. The first amplifier stage includes a differential operational amplifier, wherein the first amplifier stage is arranged to process a differential input signal to generate a differential intermediate signal, the differential input signal having a first input signal and a second input signal, and the differential intermediate signal having a first intermediate signal and a second intermediate signal. The second amplifier stage has no common-mode feedback and is arranged to process the differential intermediate signal to generate a differential output signal, wherein the differential output signal has a first output signal corresponding to the first input signal and a second output signal corresponding to the second input signal. Since the noisy common-mode feedback is removed from the second amplifier stage, the overall common-mode noise of the low pass filter can be decreased.
Abstract translation: 低通滤波器包括第一放大级和第二放大级。 第一放大器级包括差分运算放大器，其中第一放大器级被布置成处理差分输入信号以产生差分中间信号，差分输入信号具有第一输入信号和第二输入信号，以及差分中间信号 具有第一中间信号和第二中间信号。 第二放大器级没有共模反馈，并且被布置成处理差分中间信号以产生差分输出信号，其中差分输出信号具有对应于第一输入信号的第一输出信号和对应于第一输入信号的第二输出信号 第二输入信号。 由于从第二放大器级除去噪声共模反馈，所以可以降低低通滤波器的总体共模噪声。
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公开(公告)号：US09263993B2
公开(公告)日：2016-02-16
申请号：US14259120
申请日：2014-04-22
Applicant: MEDIATEK INC.
Inventor： Tzu-Hsuin Peng , Chih-Hong Lou , Chao-Hsin Lu , Chi-Yun Wang , Chih-Jung Chen
CPC classification number: H03F1/26 , H03F3/45475 , H03F3/45479 , H03F3/45932 , H03F2200/129 , H03F2200/267 , H03F2203/45061 , H03F2203/45116 , H03F2203/45138 , H03F2203/45526 , H03H11/0405 , H03H11/1217 , H03H11/1234
Abstract: A low pass filter includes a first amplifier stage and a second amplifier stage. The first amplifier stage includes a differential operational amplifier, wherein the first amplifier stage is arranged to process a differential input signal to generate a differential intermediate signal, the differential input signal having a first input signal and a second input signal, and the differential intermediate signal having a first intermediate signal and a second intermediate signal. The second amplifier stage has no common-mode feedback and is arranged to process the differential intermediate signal to generate a differential output signal, wherein the differential output signal has a first output signal corresponding to the first input signal and a second output signal corresponding to the second input signal. Since the noisy common-mode feedback is removed from the second amplifier stage, the overall common-mode noise of the low pass filter can be decreased.
Abstract translation: 低通滤波器包括第一放大级和第二放大级。 第一放大器级包括差分运算放大器，其中第一放大器级被布置成处理差分输入信号以产生差分中间信号，差分输入信号具有第一输入信号和第二输入信号，以及差分中间信号 具有第一中间信号和第二中间信号。 第二放大器级没有共模反馈，并且被布置成处理差分中间信号以产生差分输出信号，其中差分输出信号具有对应于第一输入信号的第一输出信号和对应于第一输入信号的第二输出信号 第二输入信号。 由于从第二放大器级除去噪声共模反馈，所以可以降低低通滤波器的总体共模噪声。
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