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1. 发明申请

US20160056707A1 NOTCH FILTER FOR RIPPLE REDUCTION 有权
标题翻译：凹槽过滤器减少皱纹
公开(公告)号：US20160056707A1
公开(公告)日：2016-02-25
申请号：US14669863
申请日：2015-03-26
申请人： Linear Technology Corporation
发明人： Jeremy H. Wong , Joseph G. Petrofsky
IPC分类号： H02M1/084 , H02M1/14
CPC分类号： H03H19/004 , H02M1/15 , H02M3/07 , H03F3/45475
摘要： A notch filter is controlled synchronously with a chopper to filter out chopping ripple. In one embodiment, the notch filter is coupled to the differential output of the chopper and includes a sampling capacitor, a hold capacitor, and a second set of switches between the sampling capacitor and the hold capacitor. The second set of switches is temporarily closed once per chopper switching cycle to transfer charge from the sampling capacitor to the hold capacitor such that the ripple from the chopper is not transferred to the hold capacitor. The voltage across the hold capacitor may be coupled to any other circuit, such as to the differential inputs of an amplifier.
摘要翻译：陷波滤波器与斩波器同步控制，以滤除斩波纹波。在一个实施例中，陷波滤波器耦合到斩波器的差分输出，并且在采样电容器和保持电容器之间包括采样电容器，保持电容器和第二组开关。第二组开关每斩波器切换周期暂时闭合一次，以将电荷从采样电容器传输到保持电容器，使得来自斩波器的纹波不会传输到保持电容器。保持电容器两端的电压可以耦合到任何其它电路，例如放大器的差分输入。

2. 发明授权

US09685933B2 Notch filter for ripple reduction 有权
公开(公告)号：US09685933B2
公开(公告)日：2017-06-20
申请号：US14669863
申请日：2015-03-26
申请人： Linear Technology Corporation
发明人： Jeremy H. Wong , Joseph G. Petrofsky
IPC分类号： H03F1/02 , H03H19/00 , H03F3/45 , H02M1/15 , H02M3/07
CPC分类号： H03H19/004 , H02M1/15 , H02M3/07 , H03F3/45475
摘要： A notch filter is controlled synchronously with a chopper to filter out chopping ripple. In one embodiment, the notch filter is coupled to the differential output of the chopper and includes a sampling capacitor, a hold capacitor, and a second set of switches between the sampling capacitor and the hold capacitor. The second set of switches is temporarily closed once per chopper switching cycle to transfer charge from the sampling capacitor to the hold capacitor such that the ripple from the chopper is not transferred to the hold capacitor. The voltage across the hold capacitor may be coupled to any other circuit, such as to the differential inputs of an amplifier.

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