公开(公告)号：US11520528B2

公开(公告)日：2022-12-06

申请号：US17375168

申请日：2021-07-14

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Hongjun Jin ,  Yongjae Lee ,  Seunghan Kim ,  Hyoungjoo Kim

IPC: G06F3/06 ,  G11C29/56 ,  G11C29/10

Abstract: A semiconductor memory device includes a test pattern data storage configured to store test write pattern data in response to a register write command and a register address and output test read pattern data in response to a test read command and a test pattern data selection signal during a test operation, a memory cell array including a plurality of memory cells and configured to generate read data, a read path unit configured to generate n read data, by serializing the read data, and a test read data generation unit configured to generate n test read data, by comparing the test read pattern data with each of the n read data, generated at a first data rate, and generate the n test read data, at a second data rate lower than the first data rate, during the test operation.

公开(公告)号：US10003284B2

公开(公告)日：2018-06-19

申请号：US14618046

申请日：2015-02-10

Applicant: SAMSUNG ELECTRONICS CO., LTD. ,  SNU R&DB FOUNDATION

Inventor： Je Hyung Cho ,  Alexey Bodrov ,  Yongjae Lee ,  Jung-Ik Ha

IPC: H02P5/46 ,  H02P1/54 ,  H02P5/50 ,  H02P21/22 ,  H02P21/18 ,  H02P31/00

CPC classification number: H02P5/50 ,  H02P21/18 ,  H02P21/22 ,  H02P31/00 ,  H02P2205/07

Abstract: Disclosed herein is a power apparatus including a first motor, a second motor connected with the first motor in parallel, a driver configured to supply driving currents to the first and second motors, a current detector configured to detect the driving current of the first motor and the driving current of the second motor, a speed calculator configured to calculate a rotating speed of the first motor and a rotating speed of the second motor, and a controller configured to control the driver based on the rotating speed of the first motor, wherein the controller controls the driver so that the rotating speed of the first motor and the rotating speed of the second motor are the same as each other, when the rotating speed of the first motor and the rotating speed of the second motor are different from each other.