Abstract:
시그마-델타 아날로그-디지털 변환기는 리셋 신호를 시그마-델타 변조를 통하여 제1패턴을 갖는 제1비트스트림으로 변환하고, 이미지 신호를 상기 시그마-델타 변조를 통하여 제2패턴을 갖는 제2비트스트림으로 변환하기 위한 시그마-델타 변조기와, 데시메이션 필터를 포함한다. 상기 데시메이션 필터는 상기 제1비트스트림에 포함된 특정한 값을 갖는 비트의 개수를 적분하여 제1디지털 값을 출력하고, 상기 제1디지털 값의 비트단위 보수 값을 계산하고, 상기 제1디지털 값의 상기 비트단위 보수 값을 제2디지털 값의 초기값으로 하여 상기 제2비트스트림에 포함된 상기 특정한 값을 갖는 비트의 개수를 적분하여 상기 제2디지털 값을 출력한다. 시그마-델타 변조, 시그마-델타 ADC, 이미지 촬상 장치
Abstract:
데이터의 고속 리드아웃을 위한 이미지 센서가 개시된다. 상기 이미지 센서는 픽셀 어레이로부터 출력되는 아날로그 신호에 기초하여 발생되는 디지털 신호를 라인 단위로 일시 저장하기 위한 라인 메모리 블록을 포함한다. 상기 메모리 블록은 다수의 라인 메모리들, 각각이 상기 다수의 라인 메모리들 중 상응하는 라인 메모리를 센스앰프와 연결하는 다수의 데이터 라인 쌍들, 및 각각이 상기 다수의 데이터 라인 쌍들 중 상응하는 데이터 라인 쌍을 미리 설정된 프리차지 전압으로 프리차지하기 위하여 상응하는 데이터 라인쌍에 분산 접속되는 적어도 두 개의 프리차지 유닛을 포함하는 다수의 프리차지부를 포함한다. 상기 프리차지부의 프리차지 동작에 기초하여 상기 이미지 센서는 고속의 디지털 신호 리드아웃을 수행할 수 있다. 이미지 센서(image sensor), 프리차지(precharge), 리드아웃(readout)
Abstract:
Disclosed are an analog and digital conversion circuit, an image sensor including the same, and an operation method for the same. The analog and digital conversion circuit in the present invention is for the image sensor including a plurality of rows and a pixel array including a plurality of pixels arranged in columns. The analog and digital conversion circuit includes a comparison circuit comparing a pixel signal outputted from the pixel array and a lamp signal and a limit circuit limiting a signal generated in the comparison circuit within a predetermined limit range by being connected to the comparison circuit.
Abstract:
A ramp signal generator according to an embodiment of the present invention comprises: a timing controller; a row decoder which receives a row control signal from the timing controller and generates one or more row select signals; a first column decoder which receives a first column control signal from the timing controller and generates one or more first column select signals; a second column decoder which receives a second column control signal from the timing controller and generates one or more second column select signals; and a current cell array which includes at least one current cell activated by the first column select signals, the second column select signals, and the row select signals to generate a unit current and generates an output current by summing the unit current, wherein the first column select signals and the second column select signals activate current cells included in different rows.
Abstract:
An image sensor according to an embodiment of the present invention generates a first mixing signal by mixing an active pixel array including a focus detecting pixel and a first color pixel, a focus detecting signal generated from the focus detecting pixel, and a first pixel signal generated from the first color pixel and comprises: a switching network for generating the first pixel signal as a second mixing signal; a processing circuit for processing the first mixing signal and the second mixing signal; and a calculator for calculating a signal generated by the focus detecting pixel based on a difference between the processed first mixing signal and the processed second mixing signal.
Abstract:
PURPOSE: A CDS(correlated double sampling) circuit and a method for operating the same are provided to obtain wide input range. CONSTITUTION: A method for operating a CDS circuit comprises: a step of responding to control signal and generating boosting voltage for boosting initial current voltage of a pixel signal and initial direct current(DC) voltage of a lamp signal; a step of comparing the pixel signal with boosted initial current voltage and the lamp signal of the boosted initial current voltage by a comparator circuit(161); and a step of outputting the compared signal corresponding to the compared result.
Abstract:
PURPOSE: A correlated double sampling circuit and an image sensor including the same are provided to eliminate a need of a separate circuit for subtraction operation necessary for correlated double sampling. CONSTITUTION: A delta-sigma modulator(110) performs delta-sigma modulation in an input signal. A selection circuit(120) outputs a modulation signal or outputs the inverted signal of the modulation signal. A cumulative circuit(130) performs a cumulative operation in either one of the modulation signal and the inverted signal during a first operation phase. The cumulative circuit performs a cumulative operation in the other one of the modulation signal and the inverted signal during a second operation phase.
Abstract:
PURPOSE: An incremental delta-sigma analog to digital converter and devices having the same are provided to generate an operand by using a down counter implementing the down count operation in response to the clock signal. CONSTITUTION: A delta-sigma analog to digital converter comprises a delta-sigma modulator(12), an operand generator(18-1), and a selecting circuit(14-1). The operand generator generates the operand in response to the clock signal. A selection circuit selectively transmits the operand to an adder(16) according to the output value outputted from the delta-signal modulator in response to the clock signal.
Abstract:
스위치드-커패시터적분기가개시된다. 상기스위치드-커패시터적분기는제1클락페이즈에서입력신호를샘플링하고제2클락페이즈에서샘플된입력신호를자신의증폭기를이용하여적분하고리셋동작시마다상기증폭기의입력단의전압을일정한리셋전압으로리셋시킨다. 상기리셋전압은상기증폭기의오프셋전압또는외부로부터공급된정전압일수 있다.
Abstract:
PURPOSE: An image sensor for reading out data converted into a digital format is provided to perform digital signal read out and improve pre-charge speed. CONSTITUTION: An image sensor for reading out data converted into a digital format is as follows. A pixel array includes a plurality of pixels outputting analog signal. An analog-digital converter converts analog signal into digital signal. A line memory block stores the digital signal by a line. A sense amplifier unit amplifies and senses the signal outputted from the line memory block. The line memory block composes line memory, a pair of data lines and a data line pre-charging unit(263).