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 correlated double sampling (CDS) circuit and an image sensor having the same are provided to efficiently reduce random noise without increasing its size. CONSTITUTION: A sampling unit (120) generates an output signal by performing CDS for a reset component and an image component included in an input signal provided from a pixel array based on a ramp signal. A timing controlled band-limitation (TCBL) unit (140) removes noise of the output signal based on a timing control signal activated respectively in a first comparison section and a second comparison section. First comparison operation for a ramp signal and a reset component of an input signal is performed in the first comparison section. Second comparison operation for the ramp signal and an image component of the input signal is performed in the second comparison section.
Abstract:
PURPOSE: A correlated double sampling (CDS) circuit, an image sensor including the same, and an image processing device including the image sensor are provided to increase sensitivity and a signal noise ratio by minimizing a loss of a pixel signal. CONSTITUTION: A correction circuit (141) receives a plurality of pixel signals through a first node and corrects the received pixel signals. A first input unit of a comparator (143) is connected to a second node and receives the corrected pixel signals outputs through the second node from the correction circuit. A second input unit of the comparator receives a lamp signal. The comparator outputs a comparison signal corresponding to a comparison result of the corrected pixel signals and the lamp signal. The correction circuit includes a first capacitor connected to the between of the first node and the second node and a metal line adjacent to the first capacitor. One or more capacitors are formed by the first capacitor and the metal line.
Abstract:
PURPOSE: An apparatus and a method for a sigma-delta analog to a digital converting are provided to convert an analog signal into a digital signal accurately without increase of complexity. CONSTITUTION: An apparatus and a method for a sigma-delta analog to a digital converting are comprised of the steps: converting an oversample analog input signal into an L-bit digital bit stream corresponding to a feedback signal(S20); converting L-bit digital bit stream into a multi-bit digital data(S30); and quantizing an error signal generated from sigma-delta modulation based on a lamp signal.
Abstract:
PURPOSE: A sampling circuit, a sampling method, and an optical sensing apparatus are provided to minimize interference due to offset in case a signal of a unit cell is weak. CONSTITUTION: An offset compensation reference signal generating unit(30a) inputs a first signal including offset information. The offset compensation reference signal generating unit compensates for the offset information of a reference signal. The offset compensation reference signal generating unit generates the compensated reference signal. A comparing unit(21) inputs a second signal including data information.