Samsung Electronics Co., Ltd.

Ho-sun Yoo

In-su Yang

Jae-il Lee

Sung-Yeol Kim

In-ho Choi

Woon-sup Choi

Chul-woong Jang

Jong-pill Park

Seung-ho Jang

Jeong-Gon Lee

Young-ki Kwak

Min-sung Kim

Jul-ki Seok

Seung-jun Chee

A signal capture system for capturing a signal and storing the captured signal in a storage apparatus in real time, and a test apparatus including the signal capture system. The signal capture system includes a printed circuit board; a socket that is connected to the printed circuit board and on which a reference memory component is mounted; and an interposer that is mounted on the printed circuit board, is connected to the socket, an external apparatus, and a storage apparatus, receives first signals from the reference memory component and transmits the received first signals to the external apparatus and the storage apparatus, and receives second signals from the external apparatus and transmits the received second signals to the reference memory component and the storage apparatus, wherein a shape of the socket is defined according to a type of the reference memory component.

Signal capture system and test apparatus including the same

A field mounting-type test apparatus and method for enhancing competitiveness of a product by simulating various test conditions including a mounting environment for improving quality reliability of a memory device and by minimizing overall loss due to change in a mounting environment thus reducing testing time and cost. The field mounting-type test apparatus includes a mass storage device configured to store logic data simulating a mounting environment of a device under test (DUT) and a tester main frame configured to test the DUT using the logic data.

Field mounting-type test apparatus and method for testing memory component or module in actual PC environment

A control method of a PI controller which selectively performs a proportional control and a proportional/integral control, the method includes Fourier transforming an output of the PI controller, calculating a spectral energy ratio of the transformed output of the PI controller of at a reference frequency for all frequency regions, performing the proportional control in response to the calculated spectral energy ratio exceeding a predetermined reference ratio, and the proportional/integral control in response to the spectral energy ratio being the predetermined reference ratio or less. Accordingly, a PI controller utilizing the method can easily detect a switching point between a proportional control and a proportional/integral control, independent of species and states of a system thereof.

Control method of PI controller

An apparatus for controlling a driving speed of a motor comprises a motor controller provided in the motor controlling apparatus detecting the motor driving speed in response to pulses outputted from an encoder. The motor controller adjusts a detection period for the pulses according to the motor driving speed, thereby measuring the motor driving speed. The motor controller sets the detection period so that a number of four-multiplied pulses can be a multiple of four. Although a phase difference between pulses outputted from an encoder is not constant, the motor controlling apparatus can obtain a desired response characteristic by excluding effects of a phase error between the pulses.

Apparatus and method of controlling a driving speed of a motor

An apparatus for eliminating variable offset values of current detecting signals and its method having a current detector for detecting feedback current from a three-phase AC motor and for converting the feedback current into voltage detecting signals containing offset elements, differential amplifiers for differentially operating a feedback analog offset signal and the voltage detecting signals, output amplifiers for amplifying the differentially operated voltage detecting signals to fit within the input range for controlling, an analog/digital converter for converting the amplified signals into digital signals, a control part for adding up the digital signals to a digital offset value and for comparing the digital offset value with a predetermined offset command and for applying a proportional plus integral function to the compared result and for outputting a digital offset signal of a pulse-width modulation waveform, and a digital/analog converter for converting the digital offset signal into the analog offset signal and for providing a feedback loop of the analog offset signal to the differential amplifiers. The disclosed invention can adjust a current detecting signal to a desired level of signal even though the offset element which is contained in the detecting signal of a motor such as a current detecting signal of the ASIPM is being variably changed.

Apparatus and method for eliminating variable offset values of current detecting signals

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Seongnam-si, South Korea

Ho-sun Yoo