公开(公告)号：US10034085B2

公开(公告)日：2018-07-24

申请号：US15345926

申请日：2016-11-08

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Gyu-Hyeong Cho ,  Ji-Hun Lee

IPC: H03G3/00 ,  H04R3/00 ,  H03F3/183 ,  H03F3/217 ,  H03F3/45 ,  H03G3/30

Abstract: A class-D amplifier includes an error amplification circuit, a duty signal generator, a level selection circuit, a driver and control block and an output stage. The class-D amplifier divides peal levels of an error signal into multi-level and changes a scheme for modulating the error signal when the error signal crosses each level boundary of the multi-level thereby to have an effect such as the error signal is folded. Therefore, the class-D amplifier drives output nodes with multi-level and thus the class-D amplifier may increasing efficiency while reducing EMI.

公开(公告)号：US11038480B2

公开(公告)日：2021-06-15

申请号：US16791728

申请日：2020-02-14

Applicant: SAMSUNG ELECTRONICS CO., LTD. ,  KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Hyeokki Hong ,  Ji-Hun Lee ,  Gyu-Hyeong Cho ,  Cheheung Kim ,  Hyunwook Kang

IPC: H03F3/45 ,  H03F1/02

Abstract: An amplifier includes: a first input transistor connected to a first input, a first output, and a power source or a ground, a second input transistor connected to a second input, a second output, and the power source or the ground; a first replica transistor connected to the first input, a detection node, and the power source or the ground; a second replica transistor connected to the second input, the detection node, and the power source or the ground; and a bias transistor connected to a bias voltage, the detection node, and the power source or the ground.

公开(公告)号：US20170149403A1

公开(公告)日：2017-05-25

申请号：US15345926

申请日：2016-11-08

Applicant: Korea Advanced Institute of Science and Technology

Inventor： Gyu-Hyeong Cho ,  Ji-Hun Lee

IPC: H03G7/00 ,  H03F3/217 ,  H04R3/00 ,  H03F3/183

CPC classification number: H04R3/007 ,  H03F3/183 ,  H03F3/2173 ,  H03F3/45192 ,  H03F3/4565 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2200/421 ,  H03F2200/555 ,  H03F2200/78 ,  H03G3/3005 ,  H03G3/3089

Abstract: A class-D amplifier includes an error amplification circuit, a duty signal generator, a level selection circuit, a driver and control block and an output stage. The class-D amplifier divides peal levels of an error signal into multi-level and changes a scheme for modulating the error signal when the error signal crosses each level boundary of the multi-level thereby to have an effect such as the error signal is folded. Therefore, the class-D amplifier drives output nodes with multi-level and thus the class-D amplifier may increasing efficiency while reducing EMI.