公开(公告)号：US10320337B2

公开(公告)日：2019-06-11

申请号：US15418405

申请日：2017-01-27

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Xin Zhao ,  Tejasvi Das ,  Hossein Mirzaie ,  Lei Zhu ,  Xiaofan Fei

IPC: H03F3/217 ,  H03F1/26 ,  H03F3/187 ,  H03F3/45

Abstract: A dynamic common reference input (CMRI) signal may be provided to an operational amplifier, or “op-amp,” in an amplifier system to reduce the common mode ripple of the fully-differential op-amp, while adding little or no noise in the amplifier system. The dynamic CMRI signal may be controlled such that a common-mode component of two amplifier input nodes of the operational amplifier is made approximately independent of two input signals received at two system input nodes of the amplifier system. An amplifier system with the dynamic CMRI may be used in class-D amplifiers, such as amplifiers for audio systems that generate output for headphones or speakers.

公开(公告)号：US20180062583A1

公开(公告)日：2018-03-01

申请号：US15418405

申请日：2017-01-27

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Xin Zhao ,  Tejasvi Das ,  Hossein Mirzaie ,  Lei Zhu ,  Xiaofan Fei

IPC: H03F1/26 ,  H03F3/217 ,  H03F3/45 ,  H03F3/183

CPC classification number: H03F1/26 ,  H03F3/187 ,  H03F3/2173 ,  H03F3/45475 ,  H03F3/45928 ,  H03F2200/03 ,  H03F2203/45138 ,  H03F2203/45438 ,  H03F2203/45512

Abstract: A dynamic common reference input (CMRI) signal may be provided to an operational amplifier, or “op-amp,” in an amplifier system to reduce the common mode ripple of the fully-differential op-amp, while adding little or no noise in the amplifier system. The dynamic CMRI signal may be controlled such that a common-mode component of two amplifier input nodes of the operational amplifier is made approximately independent of two input signals received at two system input nodes of the amplifier system. An amplifier system with the dynamic CMRI may be used in class-D amplifiers, such as amplifiers for audio systems that generate output for headphones or speakers.