Abstract:
An analog to digital converting apparatus using a digital control comparator, a method thereof, and a pacemaker having the same are provided to reliably realize less power consumption by selectively operating the digital control comparators by bits. An analog to digital converting apparatus includes a plurality of digital control comparators(511~519), a digital to analog converter(520), and a successive approximation logic circuit(530). The digital control comparators sequentially generate bit values from an MSB(Most Significant Bit) by comparing input voltage(Vin) with reference voltages(Vref). The digital to analog converter generates the reference voltages applied to the comparators according to the generated bit values. The successive approximation logic circuit selects the comparator to generate the bit value of the adjacent bit according to the generated bit values, turns on the comparator, and performs a binary search.
Abstract:
주파수 특성을 보상하기 위한 보상용 콘덴서의 용량을 줄여 보상용 콘덴서의 면적을 줄이고, 12비트 이상의 고해상도를 가지는 신호를 왜곡됨이 없이 처리하는 MDAC(Multiplying Digital to analog converter)를 제공한다. SHA(Sampling and Holding Amplifier) 또는 MDAC로부터 입력되는 신호에서 플래쉬 ADC(Analog to digital converter)가 디지털 신호로 변환한 레벨을 감산하는 감산기와, 제 1 바이어스 전압에 따라 정전류가 흐르는 제 1 및 제 2 정전류원과, 상기 제 1 정전류원으로 정전류가 흐르면서 상기 감산기의 출력신호를 캐스코드 증폭하는 제 1 증폭기와, 상기 제 1 증폭기의 증폭이득을 부스팅하여 증가시키는 제 1 및 제 2 부스팅용 증폭기와, 상기 제 2 정전류원으로 정전류가 흐르면서 상기 제 1 증폭기의 증폭신호를 차동 증폭하여 출력단자로 출력하는 제 2 증폭기와, 상기 제 1 및 제 2 증폭기의 사이에 구비되는 제 1 및 제 2 보상용 콘덴서로 이루어지는 것으로 제 1 및 제 2 보상용 콘덴서가 차지하는 면적 및 소모전력을 줄이고, 고해상도의 신호를 왜곡이 발생됨이 없이 처리한다. MDAC, ADC, 파이프라인 ADC, 보상용 콘덴서, DCL, 감산기, 부스팅용 증폭기
Abstract:
본 발명은 아날로그 신호를 디지털 신호로 변환하는 아날로그/디지털 변환장치에 관한 것으로서, 특히 N개의 비교기 만으로 N비트의 디지털화된 출력신호를 발생하는 아날로그/디지털 변환기에 관한 것이다. 본 발명 실시예인 N개의 변환부로 구성된 N비트 아날로그/디지털 변환기에 있어서, 상기 각 변환부는 1전압과 제 2전압을 수신 비교하는 비교기; 상기 제 2전압을 발생하는 제2전압 발생부를 구비한다. 상기 제 2전압 발생부는 일정한 전류량을 갖는 정전류원; 상기 정전류원을 수신하는 저항부를 구비하며, 상기 제 1전압은 정전압이며 상기 제2전압은 상기 저항부의 저항치에 의하여 결정된다. 상기 임의의 i번째(i는 1,2,3....i 의 정수) 변환부에 구비된 저항부는 정전류원과 접지사이에 직렬연결된 2 Ni R ,2 N-(i-1) R, 2 N-(i-2) R, ..., 2 N-{i-(i-1)} R의 저항; 상기 접지와 인접한 저항부터 각 저항과 병렬연결된 i-1개의 스위치를 구비하고, 상기 임의의 i번째 변환부에 구비된 비교기의 출력신호는 i+1,i+2,...N번째 변환부에 구비된 정전류원으로 부터 인접한 순서의 i번째 스위치로 공통으로 수신한다. 상기 각 비교기의 포지티브 단자는 상기 제 1전압을 수신하고, 상기 각 비교기의 네가티브 단자는 상기 제 2전압을 수신한다. 상기 제 2전압 발생부는 각 스위치로 수신되는 신호에 따라 상기 스위치를 온/오프해 저항비를 조절하며, 상기 스위치의 동작으로 조절된 저항값과 정전류원을 통해 제 2전압을 생성하며, 상기 정전류원은 모두 동일한 전류값을 갖는 것을 특징으로 하는 아날로그/디지털 변환기.
Abstract:
PURPOSE: An analog-digital converter and a method thereof are provided to increase accuracy by using folding and interpolation. CONSTITUTION: An upper signal processing part(120) generates an upper analog signal by amplifying an analog signal in a preset amplification ratio. A lower signal processing part(130) generates a lower analog signal by amplifying and folding the analog signal through an amplification line including an odd number of amplifiers. A comparison part(140) generates a comparison signal by comparing the upper analog signal and the lower analog signal according to a preset reference voltage. An encoding part(150) generates an upper digital signal by the upper analog signal and a lower digital signal by the lower analog signal according to the comparison signal. The encoding part generates an output signal by adding the upper digital signal and the lower digital signal. [Reference numerals] (110) Input part; (120) Upper signal processing part; (130) Lower signal processing part; (140) Comparison part; (150) Encoding part
Abstract:
PURPOSE: An ADC(Analog to Digital Converter) sharing amplifiers between two channels is provided to additionally reduce the number of pre-amplifiers by 50% by applying an interpolation method to flash ADCs. CONSTITUTION: An ADC(Analog to Digital Converter) includes a SHA(Sample-and-Hold Amplifier)(110), a MDAC1(Multiplying Digital to Analog Converter)(120), a MDAC2(130), a FLASH1(140), a FLASH2(150), and a FLASH3(160). The ADC includes an on-chip reference current and voltage generator(170), a digital correction circuit(180) including a divider, and a clock generator(190). Input terminals of the SHA, the MDAC1, and the MDAC2 are composed of two channels. Two channels share only one amplifier. The FLASH1, the FLASH2, and the FLASH3 are composed of a pre-amplifier and a latch. The FLASH1, the FLASH2, and the FLASH3 reduce the number of pre-amplifiers by 50% to consecutively process signals outputted from the SHA, the MDAC1, and the MDAC2 by sharing one pre-amplifier having a DDA(Differential Difference Amplifier) structure.
Abstract:
PURPOSE: An analog-to-digital converter using a range-scaling method is provided to reduce the number of a reference voltage driving circuit to the half without additional correction on reference voltage using the single reference voltage. CONSTITUTION: Range scaling on the input analog signal of an ADC(Analog-to-Digital Converter) of a pipeline structure is operated using only single reference voltage. An SHA(Sample-and-Hold Amplifier) of an input terminal of the ADC is removed from the input terminal of the ADC. The input analog signal is directly applied on the sampling capacitor of the FLASH1 ADC of input terminal and the MDAC1 of the input terminal. The sampling switch of the FLASH1 ADC and MDAC1 comprise a gate - bootstrapping circuit. The FLASH1 ADC is formed using only a plurality of latches.
Abstract:
PURPOSE: An analog to digital converter using partial encoding is provided to eliminate the asynchronous problem between codes due to a bottleneck phenomenon. CONSTITUTION: A voltage distributing unit(100) distributes a reference voltage. A range detector unit(200) generates a control signal. A first frontal amplifying unit(300) amplifies two differential reference voltages and two differential analog signals. A second frontal amplifying unit(400) amplifies two output signals from the first frontal amplifying unit. A comparison unit(700) synchronizes two amplification signals of a frontal amplifier of the second frontal amplifying unit. A switch unit(800) is switched on/off based on four control signals. An upper encoder unit encodes two upper bits of six bits. A lower encoder unit encodes four lower bits of six bits. A synchronization unit(1100) synchronizes the output signals of the upper encoder unit and the lower encoder unit according to a main clock signal.
Abstract:
A multiplying digital to analog converter and pipelined analog to a digital converter having the same are provided to obtain a desired value in a first timing by making the pipeline analog digital convertor have high gain in second timing. In a multiplying digital to analog converter and pipelined analog to a digital converter having the same, a sample/hold part(110) receives an analog signal. The sample/hold part produces an analog input signal by performing the sampling and holding calculation. A stage unit(120) receives analog input signal, and the stage part outputs a digital stage output power signal consisting of 1.5 bit or 2 bit. The stage part is divided into a first stage including a multiplying digital to analog converter and a second stage(122b) not including the multiplying digital to analog converter.
Abstract:
A signal converter and a method for converting a signal reduce power consumption and a layout area by applying a sharing technique and a switching technique together. A signal converter(100) includes a first amplifier always maintaining the active state, and a third amplifier maintaining the active state in a first phase and a second amplifier maintaining the active state in a second phase. While a plurality of first capacitors(C1) sample the input signal in the first phase, the serially connected first amplifier and the third amplifier amplify the voltage generated by the first voltage set. While a plurality of second capacitors(C2) sample the output voltage of the second amplifier in the second phase, the serially connected first amplifier and the second amplifier amplify the voltage generated by the second voltage set.