Abstract:
A driver for low power and large signal, and an ethernet transceiver having the same are provided to satisfy a dynamic range of voltage required for 10BASET-T, 100BASE-TX and 1000BASE-T standards and guarantee low power consumption and wide power dynamic range. Voltage buffers receive input signals by input nodes(302,402), and when the input signals are high signals, the voltage buffers output supply voltages(VDD) to output nodes(303,403), and when the input signals are low signals, the voltage buffers output a zero potential. The first current sources(306,406) are disposed in a direction that current flows to nodes(305,405) to pull up voltages of nodes(305,405), and the second current sources(307,407) are disposed in a direction that current is synchronized to a ground point to pull down voltages of the nodes(305,405). When input signals applied to the input nodes(302,402) are high signals, the first switches(308,408) provided between the first current sources(306,406) and the nodes(305,405) connect the first current sources(306,406) to the nodes(305,405), and the second nodes(309.409) provided between the second current sources(307,407) and the nodes(305,405) disconnect the second current sources(307,407) form the nodes(305,405).
Abstract:
A range-matching cell and a CAM(Content Addressable Memories) using the same are provided to use a memory more efficiently, by providing an amplitude comparison operator in performing range searching using amplitude comparison. A bit line pair comprises a bit line(BL) and an inverted bit line(/BL) for transmitting data. A memory cell(100) is connected to a word line and the bit line pair, and stores the data transmitted through the bit line pair when the word line is enabled. A search line pair comprises a search line(SL) and an inverted search line(/SL) for transmitting search data. A first comparison part(110) is connected to the memory cell, the search line pair and a match line(ML), and turns on or off a first switching device serially connected to the match line in response to the data stored in the memory cell and the search data transmitted through the search line. A second comparison part(120) connects the match line to a ground voltage or a predetermined voltage in response to the search data transmitted through the search line and the stored operator data when the first switching device is turned off.
Abstract:
본 발명은 디지털 필터 회로(digital filter)와 디지털 제어 발진기(DCO; digitally controlled oscillator)를 사용해서 회로 전체를 디지털 회로화 한 클록 데이터 복원기에 관한 것으로서, 본 발명에 따른 디지털 제어 발진기는 복수 개의 인버터 체인을 구비하고 있으며, 각각의 인버터들에게 전원 전류를 공급하는 전원 전압과 인버터 사이에 가변 저항 스위칭 매트릭스를 구성하여 공급 전원을 변화시켜 발진 주파수를 튜닝한다. 여기서, 가변 저항 스위칭 매트릭스는 PMOS 트랜지스터 배열을 사용하여 구현하되, 낮은 레벨에서의 주파수 튜닝 스텝과 높은 레벨에서의 주파수 튜닝 스텝을 서로 균등화하기 위하여 스위칭 매트릭스의 열과 열 사이에 수직 저항을 추가로 삽입하고 있다. 또한, 지터 발생 문제를 해소하기 위하여 제1차 시그마 델타 모듈레이터를 사용해서 디더링 회로를 구현하고 있으며, 세그먼트 써모미터 방식을 적용하여 적은 개수의 라우팅 라인으로 디지털 제어 발진기를 튜닝하고 있다.
Abstract:
PURPOSE: All-digital clock data recovery device and a transceiver implemented thereof are provided to digitalize the whole of a clock data restoring unit by implementing a charge pump circuit and a voltage controlled generator with a digital circuit. CONSTITUTION: A phase detector(10) samples serial data. A phase detector outputs the digital signal sequence of data and edge. A deserializer changes the digital signal sequence into a bus signal. A digital controlled oscillator(200) is comprised of a multi-stage inverter chain. The digital controlled oscillator comprises a variable resistance switching matrix the digital controlled oscillator generates a clock having an adjusted oscillation frequency. The digital controlled oscillator provides a clock to the phase detector.
Abstract:
1. 청구범위에 기재된 발명이 속하는 기술 분야 본 발명은 양방향 멀티 드롭 구조의 버스 시스템, 그를 이용한 메모리 시스템 및 메모리 모듈에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은 상호 신호 간섭을 유발하는 반사파가 존재하지 않는 양방향 멀티 드롭 구조의 버스 시스템, 그를 이용한 메모리 시스템 및 메모리 모듈을 제공함. 3. 발명의 해결방법의 요지 본 발명은 [K+1]개의 스터브; 상기 스터브 각각의 일단에 메모리 모듈이 장착되는 커넥터; 상기 커넥터에 연결되는 직렬 부하; 및 상기 스터브의 버스 선로의 특성 임피던스에 연결되는 직렬 부하를 포함함. 4. 발명의 중요한 용도 본 발명은 메모리 시스템에 이용됨. 버스, 메모리 시스템, 임피던스 매칭, 반사파
Abstract:
PURPOSE: An impedance-matched bidirectional multi-drop bus system, and a memory system and a memory module using the same are provided to suppress the generation of a reflected wave which causes ISI(Inter Symbol Interference), thereby secure bandwidth required in a next memory system. CONSTITUTION: A bidirectional multi-drop bus system(801) of a memory system(800) comprises a connector(831[0]~831[k]) which is formed one end of each of [K+1] stubs(811[0]~811[k]). Each of [K+1] memory modules(803[0]~803[K]) is installed to each connector. Each of memory chips(813[0]~813[K]) is installed in each of the [K+1]memory modules. A memory controller(805) is connected to one end of the bus system. ODT(On Die Termination) is performed for the memory chips and the memory controller with ODT load Rodt.
Abstract:
PURPOSE: A digital to analog converter for a continuous time sigma delta modulator is provided to improve performance of the converter by controlling a duty ratio of a clock signal. CONSTITUTION: An adding unit(110) adds up a continuous time analog input signal and an analog signal outputted from a digital to analog converter(140). A loop filter(120) includes at least one integrator to perform an integral operation. The integrator is comprised of an operational amplifier and a capacitor. A quantizer(130) performs the quantization operation based on the signal outputted from the loop filter and outputs the digital signal. The digital signal is comprised of one bit or plural bits. The digital to analog converter outputs the analog signal based on the digital signal outputted from the quantizer.
Abstract:
연속 시간 시그마 델타 아날로그-디지털 컨버터를 위한 루프 필터는 시그마 델타 아날로그-디지털 컨버터(ADC, Analog to Digital Converter)로부터 출력된 디지털 출력 신호의 적어도 일부를 표현하는 입력 신호를 입력받는 입력단, 및 상기 입력단과 연결되고, 전력 이득을 제공하기 위한 M개의 능동 소자들 및 상기 능동 소자들 각각으로부터 출력된 신호 모두를 표현하는 출력 신호를 출력하는 출력단을 포함하며, N(N>M)차 적분을 수행하는 아날로그 능동 필터를 포함한다. 따라서 NTF(Noise Transfer Function) 특성이 개선될 수 있다.
Abstract:
A segmented digital to analog converter is provided to perform the miniaturization by reducing the number of the switches used in a coarse digital to analog converter. A segmented DAC(Digital to Analog Converter)(100) includes a first digital to analog converter, and a second digital-to-analog converter. The first digital to analog converter includes a first output terminal and a second output terminal. The first output terminal outputs a first coarse voltage. The second output terminal outputs a second coarse voltage. The second digital to analog converter outputs a minute voltage obtained by interpolating the first coarse voltage and the second coarse voltage. The first digital to analog converter includes a register string(110), and a first switch unit(120). The register string includes a plurality of resisters which are serially connected. The register string outputs a plurality of reference voltages. The first switch unit outputs two consecutive reference voltages selected among the plurality of the reference voltages as the first and second coarse voltages. The first coarse voltage is selected among odd-number reference voltages among the plurality of reference voltages. The second coarse voltage is selected among even-number reference voltages among the plurality of reference voltages.
Abstract:
PURPOSE: A method for eliminating jitter and a digital control oscillating circuit using the same are provided to oscillate a clock in a pre-set frequency without jitter noises by constantly maintaining wave delaying time. CONSTITUTION: The output of N-type metal oxide semiconductor(MOS) drivers(160, 170) of a differential amplifier is in connection with the gate terminal of an NMOS transistor. The output of PMOS load transistors(180, 190) is in connection with the gate of a PMOS transistor. A pseudo-differential amplifying circuit is composed of the NMOS transistor and the PMOS transistor. The output of the pseudo-differential amplifying circuit is in connection with the output of an inverter terminal composed of transistors(120, 130).