Implementation method of high-speed image sensor reading circuit

Abstract

The invention discloses an implementation method of a high-speed image sensor reading circuit, and the method comprises the following steps: amplifying, sampling and holding a reference signal of a read-out line after amplification; enabling an amplification module to be separated from the sampling module, and enabling the sampling module and an analog-to-digital conversion module to carry out analog-to-digital conversion of the amplified reference signal of the read-out line, wherein the time for realizing analog-to-digital conversion of the reference signal after the read-out line amplification and the time for outputting the image signal of the read-out line and amplifying the image signal of the read-out line by the amplification module are at least partially overlapped; sampling and holding the amplified image signal of the read-out line; enabling the amplification module to be separated from the sampling module, and enabling the sampling module and the analog-to-digital conversion module to realize analog-to-digital conversion of the amplified image signal, wherein the time for realizing analog-to-digital conversion of the amplified image signal is at least partially overlapped with the time for carrying out exposure row operation and reading row address change on the image sensor pixel array, outputting a new reference signal by a new read-out line, and amplifying the new reference signal by the amplification module; and increasing image sensor readout speed.

Description

Technical field [0001] The present invention relates to the technical field of image sensors, in particular to a method for implementing a readout circuit of a high-speed image sensor. Background technique [0002] The image sensor is an important part of the digital camera. It is a device that converts optical images into electrical signals. It is widely used in digital cameras, mobile terminals, portable electronic devices and other electronic optical devices. According to different components, image sensors can be divided into CCD (Charge Coupled Device) and CMOS (Complementary Metal Oxide Semiconductor) image sensors. In addition to large-scale applications in digital cameras, CCD image sensors are also widely used in cameras, scanners, and industrial fields. CMOS image sensors are suitable for digital cameras, PC cameras, mobile communication products and other fields due to their high integration, low power consumption, local pixel programmable and immediate reading, fast ...

AI Technical Summary

Problems solved by technology

figure 1 In the readout method shown in , pixel unit clearing, reference signal readout, and image signal readout are performed serially, making the overall readout of the pixel array time-consuming and slow.

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