摘要:
An image sensor includes a reference voltage generation unit that generates a reference voltage that alternately decreases and increases at a constant rate in an operation mode of the image sensor to convert analog signals of detected incident light to a digital value using the reference voltage to determine an intensity of the incident light with high sensitivity and high signal-to-noise ratio.
摘要:
An image sensor includes a reference voltage generation unit that generates a reference voltage that alternately decreases and increases at a constant rate in an operation mode of the image sensor to convert analog signals of detected incident light to a digital value using the reference voltage to determine an intensity of the incident light with high sensitivity and high signal-to-noise ratio.
摘要:
An image sensor includes a delta-sigma analog-to-digital converter (ADC) including a delta-sigma modulator (DSM) and a voltage adjusting circuit. The DSM is configured to perform delta-sigma modulation on an analog signal from a unit pixel. The delta-sigma ADC is configured to convert the analog signal to a digital signal. The voltage adjusting circuit includes a replica inverter having a same configuration as at least one inverter included in the DSM. The voltage adjusting circuit is configured to adjust a power supply voltage and an input voltage provided to the at least one inverter based on a current flowing in the replica inverter.
摘要:
An image sensor comprises an active pixel sensor (APS) array, a first analog-to-digital converter (ADC) and a ramp signal generator. The APS array includes a plurality of pixels arranged in a two-dimensional matrix, wherein the APS array generates a reset signal and an image signal for each selected column of the APS array. The first ADC includes a correlated double sampling (CDS) circuit array comprising CDS circuits that are arranged for each column of the APS array, wherein the first ADC generates a digital code from a signal corresponding to the difference between the reset signal and the image signal which are generated by the CDS circuit using a ramp signal. The ramp signal generator generates the ramp signal, wherein a second ADC receives a feedback of the generated ramp signal and generates a feedback reference code, and wherein the ramp signal generator calibrates the ramp signal based on a comparison using the feedback reference code.
摘要:
An apparatus for canceling a fixed pattern noise in a CMOS image sensor includes a storage device, a fixed pattern noise operation circuit, and a fixed pattern noise canceling circuit. The storage device stores first reference fixed pattern noises operated in a vertical blank section of an (n−1)th frame. The fixed pattern noise operation circuit calculates second reference fixed pattern noises based on the first reference fixed pattern noises stored in the storage device and blank fixed pattern noises output in a vertical blank section of an n-th frame and outputs the second reference fixed pattern noises to the storage device to update the first reference fixed pattern noises to the second reference fixed pattern noises. The fixed pattern noise canceling circuit cancels active fixed pattern noises in combination signals based on the combination signals output in an active section of an (n+1)th frame and including the active fixed pattern noises and pixel signals and the second reference fixed pattern noises output from the storage device.
摘要:
An image sensor comprises an active pixel sensor (APS) array, a first analog-to-digital converter (ADC) and a ramp signal generator. The APS array includes a plurality of pixels arranged in a two-dimensional matrix, wherein the APS array generates a reset signal and an image signal for each selected column of the APS array. The first ADC includes a correlated double sampling (CDS) circuit array comprising CDS circuits that are arranged for each column of the APS array, wherein the first ADC generates a digital code from a signal corresponding to the difference between the reset signal and the image signal which are generated by the CDS circuit using a ramp signal. The ramp signal generator generates the ramp signal, wherein a second ADC receives a feedback of the generated ramp signal and generates a feedback reference code, and wherein the ramp signal generator calibrates the ramp signal based on a comparison using the feedback reference code.
摘要:
A ratio-independent switched capacitor amplifier includes a first sampling circuit configured to sample a first input voltage as a first sampling voltage and to double a level of the first sampling voltage during an interval in which the first input voltage is cut off; a second sampling circuit configured to sample a second input voltage as a second sampling voltage and to double a level of the second sampling voltage during an interval in which the second input voltage is cut off; and a differential amplifier circuit configured to output a difference between the first sampling voltage and the second sampling voltage.
摘要:
A digital double sampling method, a related complementary metal oxide semiconductor (CMOS) image sensor, and a digital camera comprising the CMOS image sensor are disclosed. The method includes generating first digital data corresponding to an initial voltage level apparent in a pixel in response to a reset signal, inverting the first digital data, outputting a detection voltage corresponding to image data received from outside of the CMOS image sensor, and counting in synchronization with a clock signal, starting from an initial value equal to the inverted first digital data, and for an amount of time responsive to a voltage level of the detection voltage.
摘要:
A method for operating an image capture device having a sensor with an array of first and second pixels includes capturing an image a plurality of times with the second pixels to produce a corresponding second image signal, the second pixels being white pixels, capturing the image a single time with the first pixels to produce a corresponding first image signal, inputting selecting signals to the sensor via a row driver to obtain the first and second image signals from the first and second pixels, respectively, and converting the first and second image signals to respective digital values via an analog-to-digital converter.
摘要:
A digital double sampling method, a related complementary metal oxide semiconductor (CMOS) image sensor, and a digital camera comprising the CMOS image sensor are disclosed. The method includes generating first digital data corresponding to an initial voltage level apparent in a pixel in response to a reset signal, inverting the first digital data, outputting a detection voltage corresponding to image data received from outside of the CMOS image sensor, and counting in synchronization with a clock signal, starting from an initial value equal to the inverted first digital data, and for an amount of time responsive to a voltage level of the detection voltage.