Abstract:
본 발명에 따른 다단 연속 근사 레지스터 아날로그 디지털 변환기(Successive Approximation Register Analog Digital Converter)는 파이프라인 ADC와 유사한 수십 내지 수백 MHz 의 동작 속도를 유지하면서도 칩 면적과 전력소모를 줄일 수 있는 것을 특징으로 한다. 또한, 본 발명에 따른 아날로그 디지털 변환 방법은 다단으로 연결된 각 SAR ADC에서 동시 다발적으로 아날로그 디지털 변환이 이루어지므로, 아날로그 디지털 변환 시간을 줄일 수 있는 것을 특징으로 한다. ADC, SAR(Successive Approximation Register), pipeline ADC
Abstract:
PURPOSE: A memory system comprising a plurality of DMA channels and an integrating management method for a plurality of DMA channels are provided to improve data transmission efficiency of a memory controller by the integrated management of multichannel memory controller and connected multiple DMA channels. CONSTITUTION: A memory controller(200) performs data transceiving operation with a memory(100). The memory controller comprises multiple channels which are physically separated each other. A DMA controller (300) is connected to the multiple channels of the memory controller and includes multiple DMA channels which are physically separated each other. The DMA controller performs data transceiving operation with the memory through the multiple DMA channels and the memory controller. An access module(400) connects the channels of the memory controller with the DMA channels each other.
Abstract:
PURPOSE: A pseudo-differential integrated capacitor switching digital-analog converter(DAC) is provided to maximize the capacitance of a capacitor unit by reducing the number of capacitors. CONSTITUTION: A sequential access DAC includes a positive DAC(200), a negative DAC(100), a comparator(300), and a logic part(400). The structures of the negative DAC and the positive DAC are identical. The negative DAC and the positive DAC respectively includes four bits, one coupling capacitor, and four switching elements. A bit capacitor is in connection with the input terminal of the comparator.
Abstract:
PURPOSE: An absolute difference operation device is provided to use one adder and one comparator, thereby performing absolute difference operation with a low logic surface load. CONSTITUTION: A comparator(410) compares the size between two integers. According to the comparing result, the first and the second selectors(420,430) respectively select/output one among two integers. An inverter(440) mending-process a selection result value of the second selector. An adder(450) adds 1 and a value which is mending-processes by the inverter and the selection result value of the first selector.
Abstract:
PURPOSE: An active type RC integrator and a continuous time sigma-delta modulator are provided to improve the gain of an active type RC integrator by turning on a switch. CONSTITUTION: A first base resistor(RBASE1) is connected between a first input node and the positive input terminal of an amplifier. A second base resistor(RBASE2) is connected between a second input node and the negative input terminal of the amplifier. A first resistor part(1) is connected between the second input node and the positive input terminal of the amplifier. A second resistor part(2) is connected between the first input node and the negative input terminal of the amplifier. A first switch(SWDUM1) switches on and off the first base resistor. A second switch(SWDUM2) switches on and off the second base resistor. The gain of an input signal is controlled according to the input resistance varied by the first resistor part and the second resistor part.
Abstract:
PURPOSE: A DMA controller with an interrupt control processor is provided to reduce interrupt control load of a main processors. CONSTITUTION: A DMA(Direct Memory Access) channel register bank(240) stores a DMA channel operation request and a DMA set point. An interrupt control processor(250) performs a control program stored in a program memory(220). A DMA channel control module(270) controls operation of a DMA channel(150) according to the DMA set value by responding to a DMA channel activation command. An interrupt/DMA request and cancel module(260) generates a release signal about an interrupt processed by the interrupt control processor.
Abstract:
PURPOSE: A voltage controlled generator is provided to operate in a differential mode and a common mode by independently connecting a complementary active circuit element to both sides of a resonant unit. CONSTITUTION: A first oscillator comprises transistors(M5-M8) such as a complementary active element connected to both ends of a resonant unit(60) of a transformer base through an N-PMOS cross-connection structure. A second oscillator comprises transistors(M1-M4) such as a complementary active element connected to both ends of a resonant unit(60) of a transformer base through a gate coupling structure. A double band voltage controlled oscillator is formed by binding the first and second oscillators.
Abstract:
본 발명은 밴드갭 기준전압 발생기에 관한 것으로, 제1, 2 바이폴라 트랜지스터에 제4, 5 NMOS 트랜지스터를 병렬로 각각 연결하여 절대온도에 반비례하는 CTAT(Complementary To Absolute temperature) 전압이 상기 제5 NMOS 트랜지스터의 문턱전압 만큼 감소되도록 한 것을 특징으로 한다. 따라서, 본 발명에 따르면, 절대온도에 비례하는 PTAT(Proportional To Absolute Temperature) 전압의 온도 계수에 대한 가중치값이 감소되어 제로의 온도 계수를 위한 저항비를 1/2 정도로 줄일 수 있으므로 밴드갭 기준전압 발생기의 소형화를 도모할 수 있다. 또한, 상기 제1, 2 바이폴라 트랜지스터에 병렬로 각각 연결된 제2, 3 저항에 의해 1V 이하의 안정된 기준전압을 제공할 수 있다. 저전압, 기준전압, 트랜지스터, 저항, 온도 계수, 가중치
Abstract:
PURPOSE: A ring oscillator with a broadband output frequency is provided to simply change an oscillation frequency by controlling a control signal applied to the varactor. CONSTITUTION: Each delay cell comprises a transconductance unit(210), a reverse speed varying unit(230), and an output speed varying unit(270). The transconductance unit outputs a signal delayed for a preset time to first and second output nodes by reversing a first differential input signal of the delay cell. The reverse speed varying unit is connected to the transconductance unit. The reverse speed varying unit varies the revere speed of the first differential input signal according to the first control signal. An active load unit provides an active load to the transconductance unit by receiving a second differential input signal from the delay cell before two stages. The output speed varying unit varies the output speed of the differential output signal from the transconductance unit according to a second control signal.
Abstract:
PURPOSE: A low voltage frequency synthesizer is provided to prevent performance deterioration caused by a broadband, low phase noise, external environment, and process deviation by supplying the supply power of a charge pump from a voltage-controlled oscillator. CONSTITUTION: A frequency/phase detector(140) receives and compares a reference frequency and a feedback frequency and outputs comparison signal. A charge pump(110) receives the comparison signal and outputs a current that corresponds to the comparison signal. A low band pass filter(120) generates a voltage in correspondence to the output current of the charge pump. A voltage-controlled oscillator receives the message of the low band pass filter. A DC voltage converter(150) receives the boosting voltage of the voltage-controlled oscillator.