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Image pickup apparatus

An image pickup device and pixel technology, applied in image communication, TV, color TV components, etc., can solve the problems of reducing noise, reducing frame rate, increasing inversion delay, etc.

Active Publication Date: 2013-02-06
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in bandwidth limitation using a fixed capacitor, when the slope of the ramp reference voltage is changed, the inversion delay in the comparator increases because the bandwidth of the comparator is too narrow to reduce the frame rate, or because the bandwidth of the comparator Too wide so it is impossible to reduce noise sufficiently

Method used

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Examples

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Embodiment Construction

[0016] figure 1 is a block diagram showing an example of the configuration of an image pickup device according to an embodiment of the present invention. refer to figure 1 , the image pickup device is, for example, a camera system, and includes an optical unit that guides incident light into the pixel region (forming an image of an object) of the image sensor 110 in which column-parallel AD converters are loaded, for example, formed on the imaging surface A lens 101 for an image of incident light (image light). The image pickup device includes an image sensor 110 in which column-parallel AD converters are loaded, an image processing unit 108 that performs certain signal processing on pixel signals supplied from the image sensor 110 , and a control unit 109 that controls driving of the image processing unit 108 . The control unit 109 includes a timing generator that generates various timing signals (including a start pulse and a clock pulse) for driving circuits in the image ...

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Abstract

The invention relates to an image pickup apparatus. The image pickup apparatus includes a pixel generating a signal by photoelectric conversion, a comparator comparing the signal based on the pixel with a reference signal varied with time, a counter performing counting until the comparator outputs a signal indicating that the relationship in magnitude between the signal based on the pixel and the reference signal is reversed, and a control unit. The comparator includes a first amplifier receiving the reference signal at a first input portion and the signal based on the pixel at a second input portion to compare the signal based on the pixel with the reference signal. The control unit sets a bandwidth of the comparator to a first bandwidth when the reference signal varies at a first rate of change and to a second bandwidth when the reference signal varies at a second rate of change.

Description

technical field [0001] The present invention relates to image pickup devices. Background technique [0002] An image sensor is proposed in which column-parallel analog-to-digital (AD) converters (each column-parallel AD converter includes one AD converter for each pixel column) are loaded as a pixel readout circuit. The column-parallel AD converter compares a pixel signal with a ramp reference signal using a comparator, and counts the time from the start of conversion to the inversion of the output from the comparator to perform AD conversion. The parallel AD converter per column has a low-speed AD converter for each pixel column to perform AD conversion in parallel. Therefore, bandwidths of comparators and amplifiers constituting the column-parallel AD converter can be reduced, making the column-parallel AD converter superior to other AD conversion methods in terms of signal-to-noise (S / N) ratio. In order to reduce noise in column-parallel AD converters, the bandwidth of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/357H04N5/378H04N25/00
CPCH03M1/56H04N5/378H03M1/004H04N25/78H04N25/75
Inventor 石桥浩二
Owner CANON KK
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