Abstract:
회로 기판이 제공된다. 회로 기판은 다수 개의 반도체 장치를 전기적으로 연결하는 마이크로 스트립이 일면 또는 양면에 형성된 회로 기판 본체, 마이크로 스트립 상에 형성되어 마이크로 스트립을 보호하는 보호층, 보호층 상에 형성되고, 전기적으로 접지된 도전층을 포함한다. 회로 기판, PCB, 임피던스, 도전성 도료, 도포
Abstract:
커맨드 신호의 에러 검출 기능을 가지는 메모리 모듈이 개시된다. 본 발명에 따른 메모리 모듈은 적어도 하나의 제1 탭, 복수의 제2 및 제3 탭들, 적어도 하나의 제4 탭, 및 복수의 메모리 장치들을 구비하는 것을 특징으로 한다. 외부의 커맨드 신호가 적어도 하나의 제1 탭에 입력되고, 외부의 패리티 신호들이 복수의 제2 탭들에 각각 입력된다. 또, 복수의 제3 탭들을 통하여 출력 패리티 신호들이 각각 외부에 출력되고, 적어도 하나의 제4 탭에 어드레스 신호가 입력된다. 복수의 메모리 장치들은 제1 탭과 제4탭을 각각 공유하고, 복수의 제2 탭들 및 복수의 제3 탭들에 각각 연결된다. 복수의 메모리 장치들은 입력 패리티 신호들에 각각 응답하여 커맨드 신호와 어드레스 신호의 에러를 검출하고, 그 검출 결과로서 출력 패리티 신호들을 각각 출력한다. 본 발명에 따른 메모리 모듈은 패리티 신호의 입력 또는 출력을 위한 추가의 탭들을 구비하지 않고도 커맨드 신호의 에러를 검출할 수 있는 장점이 있다.
Abstract:
본 발명은 반도체 메모리 장치에 관한 것으로, 내부 클럭신호 발생회로를 포함하는 반도체 메모리 장치에 있어서, 내부 클럭신호 발생회로는 외부 클럭신호와 동기된 내부 클럭신호를 발생시키기 위한 지연동기루프, 테스트 모드에서 외부 클럭신호 주기의 1/2인 주기를 갖는 내부 클럭신호를 발생시키는 2 분주 회로, 및 테스트 모드에서 빠른 주기를 갖는 내부 클럭신호의 "하이"인 구간과 "로우"인 구간의 시간 간격이 동일해지도록 듀티를 보정하기 위한 듀티 보정회로를 구비하는 것을 특징으로 한다. 본 발명에 따른 반도체 메모리 장치는 반도체 메모리 장치의 내부 클럭신호보다 느린 클럭신호를 공급하는 테스터를 사용하여 테스트할 수 있으며, 모드 선택신호가 발생하지 않은 경우에 사용되는 핀의 고유한 동작을 모드 선택신호가 발생한 경우에 테스트할 수 있다. 또한, 본 발명에 따른 반도체 메모리 장치의 내부 클럭신호 발생회로에 의하면, 테스트 모드에서 외부 클럭신호보다 빠르고 듀티가 일정한 내부 클럭신호를 발생시킬 수 있다.
Abstract:
PURPOSE: A semiconductor memory device tested by using a tester supplying a clock signal slower than an internal clock signal thereof is provided to perform a test by using a tester for supplying a clock signal slower than an internal clock signal. CONSTITUTION: A semiconductor memory device tested by using a tester supplying a clock signal slower than an internal clock signal thereof includes a delay locked loop, a second division circuit(260) and a duty correction circuit(270). The delay locked loop generates an external clock signal synchronized to an internal clock signal. The second division circuit(260) generates an internal clock signal having a 1/2 period of the external clock signal in test mode. And, the duty correction circuit(270) corrects the duty so that the time intervals between a high period and a low period in the inner clock signal having a rapid period are equal to each other in the test mode.
Abstract:
A method of detecting a reproduction signal from an optical disc. A light beam reflected from a recording surface of an optical disc is divided into a central light beam portion and outer light beam portions in a direction corresponding to a radial direction of the optical disc. The central light beam portion and outer light beam portions are detected and a first detection signal from the central light beam portion and a second detection signal from at least one of the outer light beam portions are output. The amplitude of at least one of the first and second detection signals is adjusted and the reproduction signal is detected by subtraction between the first detection and second detection signals so that where reproduction is carried out on an optical disc having a varying track width the reproduction signal is improved.
Abstract:
PURPOSE: An apparatus and method for generating a tracking error signal of an optical disk system are provided to filter output signals of a multi-division photo detector to prevent distortion of a tracking error signal. CONSTITUTION: A tracking error signal generator of an optical disk system includes a photo detector that sequentially has four light-receiving regions A, B, C and D in a radial direction, to generate a tracking error signal. The tracking error signal generator includes the first, second and third calculation units(41,43,49), a low pass filter(45), and an amplifier(47). The first calculation unit subtracts the quantity of received light of the light-receiving region C from the quantity of received light of the light-receiving region B. The second calculation unit subtracts the quantity of received light of the light-receiving region D from the quantity of received light of the light-receiving region A. The low pass filter filters the output signal of the second calculation unit. The amplifier amplifies the output signal of the low pass filter. The third calculation unit subtracts the output signal of the amplifier from the output signal of the second calculation unit.
Abstract:
PURPOSE: A spherical aberration compensating device and an optical pickup device employing the same are provided to reduce the deterioration of the compensation effect due to the mis-alignment between the centers of an objective lens and a spherical aberration compensating element. CONSTITUTION: A spherical aberration compensating device includes a central compensation part(101) having an optical axis designed to be accorded with an optical axis of an objective lens, and having a phase distribution for compensating the spherical aberration according to a thickness deviation of a recording medium, and an environmental compensation part(102) for surrounding the central compensation part and having a phase distribution corresponding to an inconsistency between the optical axis of the objective lens and the optical axis of the central compensation part for reducing deterioration in the spherical aberration compensation due to the inconsistence between the optical axes.
Abstract:
PURPOSE: An optical disk device and a method for regenerating a wobble signal is provided to prevent the regenerated wobble signal from deteriorating due to crosstalk from wobbles formed in the neighbor tracks. CONSTITUTION: An optical disk device includes an optical dividing/detecting device(10) dividing an optical beam irradiated to and reflected from an optical disk into four in a direction corresponding to a radial direction of the optical disk; a signal processor(30) detecting a first difference signal differentiating detecting signals to inner optical areas of the divided/detected optical beams, a second difference signal differentiating detecting signals to outer optical areas of the divided/detected optical beams, and detecting a wobble signal by differentiating the first difference signal and the second difference signal.
Abstract:
PURPOSE: A memory module having a control circuit for operating memory devices and a data buffer with a same clock frequency is provided to reduce the test cost by equalizing operation clock frequencies of a data buffer and memory devices. CONSTITUTION: Plural memory devices(41,43) input/output data, in response to a memory clock. A data buffer(45) buffers write data inputted through input/output pins to output it to the memory devices(41,43), in response to a buffer clock having a frequency different to the memory clock in a normal operation. And, the data buffer(45) buffers read data outputted from the memory devices(41,43) to output it to the input/output pins. The data buffer(45) includes a control circuit for operating the memory devices(41,43) and the data buffer(45) as the same clock frequency in a test mode to test the memory devices(41,43).
Abstract:
PURPOSE: An optical pickup adapting an objective lens device is provided to assemble the objective lens device to a three-sheet lens including a lens having power of a sound below 45 abbe numbers, and to form at least one side of the three-sheet lens as an aspheric side, thereby compensating chromatic aberration of blue light. CONSTITUTION: Optical path converters convert paths of a light source(51) and an incident light. An objective lens device(10) focuses the incident light to form an optical spot on a recording medium(30). An optical detector(73) receives the incident light reflected on the recording medium and passing through the optical path converters. The optical path converters are arranged on an optical path between the light source and the objective lens device. The optical path converters are composed of a polarized beam splitter(57) and a quarter wavelength plate(59). The polarized beam splitter transmits or reflects the incident light according to polarization. The quarter wavelength plate changes a phase of the incident light. The optical detector receives the light reflected from the recording medium to detect an information signal and an error signal. A collimating lens(53) focuses a light emitted from the light source to change into a parallel light. A beam shaping prism(55) shapes an oval beam as a circular beam. A sensing lens is an astigmatism lens for causing astigmatism on the incident light.