Abstract:
PURPOSE: A digital analog converter, a driving apparatus including the same, and a display apparatus are provided to remove the loading effect without any additional current. CONSTITUTION: A digital analog converter (1500) comprises an R- DAC (Digital to Analog Converter) (1510, 1520, 1530) connected with a cascade and a buffer (1540). The R- DAC (1510) comprises multiple resistance strings (R1) and a decoder (1512). The R-DAC (1520) comprises multiple resistance strings (R2) which connected to the R-DAC (1510) and a decoder (1522). The R-DAC (1530) comprises multiple resistance strings (R3) which connected to the R-DAC (1520) and a decoder (1532). The buffer is connected to the output terminal of the R-DAC (1530). [Reference numerals] (1512,1532) Four bits decoder; (1522) Two bits decoder
Abstract:
An adaptive control circuit for the current cell control of a digital-analog converter and the digital analog converter including the same are provided to reduce the peak noise of the current source and the vibration noise of the output signal by reducing the variance of the signal switching. A digital to analog converter comprises a controller(40), an adaptation controller(50), and an analog signal output unit(60). The adaptation controller and the analog signal output unit are included in each cell of the current cell. The controller outputs the first control signal(Vin,Vinb) for switching the MOS transistor included in the analog signal output to the adaptation controller. The adaptation controller receives the first control signal from the controller, and adjusts the variance of the first control signal, and produces the second controlling signal(vin',Vinb'), and outputs the generated second controlling signal to the analog signal output unit. The analog signal output unit outputs the analog signal according to the second controlling signal.
Abstract:
A digital-analog converter and a digital-analog converting method are provided to obtain a nonlinear output characteristic approximated to a gamma curve of an LCD panel. An integrated circuit includes an operational amplifier(251), a first capacitor(Csa), a plurality of second capacitors(270), and a switching circuit(280). The operational amplifier includes a first input terminal, a second input terminal and an output terminal. The first capacitor includes a first terminal and a second terminal. The second terminal is connected to a first input terminal of the operational amplifier. The second capacitor includes the first terminal and the second terminal. The second terminal is connected to the second input terminal of the operational amplifier. The switching circuit includes the plurality of switches which are switched by responding to a corresponding switching signal among the plurality of switching signals. The switching circuit transmits the reference voltage to the first terminal of the first capacitor and the respective first terminals of the second capacitors. The switching circuit connects the first input terminal of the operational amplifier to the output terminal of the operational amplifier. The switching circuit separates the reference voltage from the first terminal of the first capacitor for the second section and transmits the selected voltage of two selection voltage or more to the respective first terminal of the second capacitors. The first terminal of the first capacitor is connected to the output terminal of the operational amplifier.
Abstract:
본 발명은 아날로그 그래픽 신호를 샘플링 및 홀딩하여 증폭하는 샘플링/홀딩용 증폭기로 12비트 이상의 고해상도와, 100㎒ 이상의 고속 동작을 만족한다. 12비트 이상의 높은 해상도를 얻기 위하여 2단 증폭기로 아날로그 그래픽 신호를 2단 증폭하고, 아날로그 그래픽 신호를 2단 증폭하면서 높은 이득을 얻을 수 있도록 부스팅용 증폭기를 구비하여 이득을 증가시키고, 100㎒ 이상의 고속으로 동작할 수 있도록 하는 것으로서 제 1 바이어스 전압에 따라 소정 레벨의 정전류가 흐르는 제 1 정전류원과, 상기 정전류원에 의해 정전류가 흐르면서 입력단자로 입력되는 아날로그 그래픽 신호를 차동 증폭하는 제 1 증폭기와, 상기 차동 증폭기의 출력신호를 증폭하여 출력단자로 출력하는 제 2 증폭기와, 상기 제 2 증폭기의 증폭이득을 증가시키는 제 1 및 제 2 부스팅용 증폭기로 구성하여 고화질과, 콘트라스트 및 밝기가 향상된다. 아날로그/디지털 변환기, 샘플링/홀딩용 증폭기, 고해상도, 모니터
Abstract:
본 발명은 디지털 서보 시그널을 위한 D/A 변환 인터페이스에 관한 것이다. 본 발명에 따르면 복잡한 D/A 컨버터나 외부에 커패시터와 저항을 필요로 하는 OP 앰프 없이 D/A 변환 인터페이스를 구성하며, 3개의 정전류원과 동일한 타입의 2개의 스위치를 사용한다. 이와 같이 하면 스위칭 속도 차이로 인한 신호 왜곡이 발생하지 않기 때문에 모터를 정밀하게 제어할 수 있다.
Abstract:
PURPOSE: An analog-digital converter for providing a reference voltage by using analog memories instead of serial resistors is provided to reduce the size and the power consumption by using the analog memories instead of the serial resistors. CONSTITUTION: An analog-digital converter includes a plurality of analog memories, a plurality of comparators, and a decoder. The analog memories(M1-Mn) are composed of injectors and transistors in order to provide predetermined voltages. The comparators(comp1-compn) are used for receiving external signals and a reference voltage from one of analog memories and comparing the external signals with the reference voltage. The decoder(211) is used for outputting a digital signal by combining output signals of the comparators.
Abstract:
PURPOSE: A digital/analog converter circuit with an input buffer circuit is provided to output a signal having a desired noise characteristic by using an input buffer circuit for controlling an input signal and a simple RC filter. CONSTITUTION: An input buffer circuit(10) is synchronized with a low sampling frequency in order to receive digital input data and a multitude of signal from the outside. The input buffer circuit(10) is synchronized with a high sampling frequency in order to output the digital input data to a digital/analog converter(20). The digital/analog converter(20) receives the digital data from the input buffer circuit(10) and outputs analog signals. An RC filter circuit(30) receives the analog signal from the digital/analog converter(20) and filters frequencies of a low band to reduce noise.
Abstract:
본 발명에 따른 디지털 아날로그 변환기의 고속화장치에는, 디지털신호와 아날로그신호를 서로 변환시키기 위하여 적어도 두 개의 스위칭부가 포함되는 디지털 아날로그 변환기; 및 상기 스위칭부의 저항을 조정하는 캘리브레이션부가 포함되고, 상기 캘리브레이션부에는, 상기 스위칭부와 유사한 제 1 스위치 및 제 2 스위치; 상기 제 1 스위치 및 상기 제 2 스위치의 저항을 비교하는 비교기; 및 상기 비교기의 결과값을 증폭하여 출력하는 증폭기가 포함되고, 상기 증폭기의 출력값은 상기 적어도 두 개의 스위칭부로 각각 입력되어 상기 적어도 두 개의 스위칭부의 저항값을 조정한다. 본 발명에 따르면, 디지털 아나로그 변환기를 고속으로 동작시킬 수 있는 효과를 기대할 수 있다.
Abstract:
PURPOSE: A digital analog converter which applies an electric charge subtraction method is provided to minimize errors of capacitors and relatively reduce a size of a decoder. CONSTITUTION: A control signal generating device(340) generates a switch control signal in response to digital data of N bits. A resistance string(310) comprises a first resistor array, a second resistor array, and a third resistor array which respectively divide multiple resistances which are connected between a reference voltage and a grounding voltage in series. A switch block(320) outputs a selection voltage by switching a part of voltage which is applied to any node of multiple serial resistances respectively included in the first resistor array, the second resistor array, and the third resistor array in response to the switch control signal. A conversion voltage generating block(330) generates a conversion voltage in response to a negative phase clock signal which is opposite to a positive phase clock signal.