Abstract:
PURPOSE: An integrator with current sharing, a sigma-delta analog digital converter with a current sharing, and a sensor device with current sharing is provided to have high efficiency performance by reducing whole usage current to a half of a conversional usage. CONSTITUTION: In an integrator with current sharing, a sigma-delta analog digital converter with a current sharing, a sensor device with current sharing, a first sampling capacitor part outputs a first input signal. The first input signal samples initial input signal at integration period. A second sampling capacitor part outputs a second input signal sampling the first signal. The first signal is integrated according to the first input signal. A first amplification section applies the integrated first signal to the second sampling capacitor part. A second signal is integrated according to the second input signal. A second amplifier outputs the integrated second signal. A current switching unit(131) applies a share current to the first amplification unit at the integration period of the first sampling capacitor part. A current switching unit applies a share current to a second amplification unit at the sampling period of the first sampling capacitor part.
Abstract:
본 발명은 센서에 의해 측정된 물리적 신호의 크기를 원하는 측정값으로 매핑하는 방법에 있어서 물리적 신호의 크기를 디지털 값으로 변환하는 아날로그 디지털 컨버터의 게인 편차에 의한 에러를 보상하는 캘리브레이션 방법에 관한 것이다. 본 발명에 따른 ADC의 캘리브레이션 방법은 ADC를 게인의 크기에 따라 표준의 게인을 가지는 표준 게인 그룹, 표준보다 높은 게인을 가지는 하이 게인 그룹, 그리고 표준보다 낮은 게인을 가지는 로우 게인 그룹들로 분류하는 과정; 상기 분류된 그룹들 각각에 상당하는 변환식들을 설정하는 과정; ADC에 의해 아날로그값을 디지털 값으로 변환하고, 디지털 변환된 값을 ADC가 속한 그룹에 해당하는 변환식에 의해 원하는 측정값으로 매핑하는 과정; 및 매핑된 측정값을 상기 ADC가 속한 그룹을 참조하여 캘리브레이션하는 과정을 포함하는 것을 특징으로 한다. 본 발명에 따른 ADC의 캘리브레이션 방법은 ADC의 게인 편차에 의한 측정값의 오류를 보상함으로써 정확한 측정값을 얻게 하는 효과를 가진다.
Abstract:
A successive approximation register analog-to-digital converter and an analog-to-digital converting method using the same are disclosed. According to the present invention, the successive approximation register analog-to-digital converter comprises: a first split capacitor array for converting digital signals inputted in sequence into analog signals and generating a reference voltage signal; a second split capacitor array for selectively holding one among a plurality of analog input voltages inputted from the outside and generating a hold voltage signal; a comparison unit for comparing the reference voltage signal with the hold voltage signal and outputting a comparison signal; and a signal processing unit for sequentially outputting the digital signals to the first split capacitor array by using the comparison signal and outputting a channel control signal to the second split capacitor array, wherein the second split capacitor array generates the hold voltage signal with respect to one among the plurality of analog input voltages according to the channel control signal.
Abstract:
PURPOSE: A double slope integrating ADC(Analog To Digital Converter) is provided to minimize a chip area by forming a switch control logic circuit part with a MCU(Micro Control Unit) and a single chip by using a standard CMOS(Complementary Metal Oxide Semiconductor) process. CONSTITUTION: An LOTA(Linear Operational Transconductance Amplifier) outputs a current by being applied with an analog input voltage and a reference voltage. First resistance applies the analog input voltage to an (+) input terminal in the LOTA. A first switch applies the analog input voltage to the first resistance according to a control signal. Second resistance applies the reference voltage to a (-) input terminal in the LOTA. The second switch applies the reference voltage to the second resistance according to the control signal. A capacitor outputs a voltage by charging an output current in the LOTA. A third switch initializes the output current in the LOTA and the voltage charged in the capacitor. A comparator outputs two constant voltages. A switch control logic circuit outputs the control signal controlling the operation of first, second, and third switches.
Abstract:
PURPOSE: A nonlinear single slope AD converter, an image sensor device using the same, a temperature sensor device using the same and a nonlinear slope AD conversion method are provided to acquire reliable nonlinear characteristics by using a digital circuit. CONSTITUTION: A ramp generating part generates a ramp input having a set gradient. A comparator(110) compares an input voltage with the ramp input. A control block(120) transfers information about a comparison time point between the input voltage and the ramp input to a memory unit(140). The control block generates the signal saved in the memory unit or the signal for calling information. The nonlinear counter generates a signal with difference sampling frequencies from inputted clock signals.
Abstract:
An analog-digital converter capable of improving accuracy of conversion operation, on die thermal sensor including the same, and implementing method thereof are provided to facilitate application in a DRAM(Dynamic Random Access Memory) etc by not requiring a charge pump. An analog-digital converter capable of improving accuracy of conversion operation comprises an integrating part(420) and a counting part(430). The integrating part integrates a conversion object voltage having a positive value in a reverse terminal and a first voltage higher than the conversion object voltage in a non-reverse terminal with a positive slope during a predetermined time. The integrating part outputs and integrates a second voltage higher than the first voltage instead of the conversion object voltage in the reverse terminal with a negative slope after the predetermined time. The counting part outputs a digital code by counting a time that an output voltage of the integrating part falls down to a specified level.
Abstract:
PURPOSE: A method for extending an output value of an analog/digital converter using one-chip micom is provided, which controls devices like a thermometer and a hygrometer accurately and stably without additional cost. CONSTITUTION: According to the one-chip micom where an analog/digital(A/D) converter is embedded, an internal program is performed in the one-chip micom, and resistors(R2,R3) are connected to the one-chip micom serially. And an output value of the A/D converter is extended by a circuit where capacitors(C2,C3) are connected to the above resistors in parallel. The values of the resistors and the capacitors are controlled. The internal program performed in the one-chip micom extends the output value of the A/D converter without controlling an external circuit of the one-chip micom.
Abstract:
지진기록계용 AD 보드접속장치가개시된다. 본발명의지진기록계용 AD 보드접속장치는 AD 보드를선택하는보드선택부; AD 보드의기능을선택하는기능선택부; 보드선택부에의해선택된 AD 보드와기능선택부에의해선택된기능을조합하는논리부; 및논리부의출력에따라, 보드선택부에의해선택된 AD 보드로부터출력된데이터를메인보드에전달하거나또는메인보드로부터전달된기능선택명령을보드선택부에의해선택된보드에전달하는버퍼부를포함하는것을특징으로한다.