Related double-sampling circuit, control method of related double-sampling circuit, image sensor system and control method of image sensor system

Abstract

The invention provides a related double-sampling circuit, a control method of the related double-sampling circuit, an image sensor system and a control method of the image sensor system. The first end of a first switch is connected with the first end of a third switch; the second end of the first switch is connected with the first end of a first capacitor and the first end of a fifth switch; the second end of the first capacitor is connected with the second end of a second capacitor, the first end of a seventh switch, the first end of a fifth capacitor and a first input end of a differential amplifier; the first end of a second switch is connected with the first end of a fourth switch; the second end of the second switch is connected with the first end of the second capacitor and the first end of a sixth switch; the second end of the third switch is connected with the first end of a third capacitor and the second end of the fifth switch; the second end of the third capacitor is connected with the second end of a fourth capacitor, the first end of an eighth switch, the first end of a sixth capacitor and the second input end of the differential amplifier; the second end of the fourth switch is connected with the first end of the fourth capacitor and the second end of the sixth switch; the second ends of the fifth capacitor and the sixth capacitor are connected with the output end of the differential amplifier.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a correlated double sampling circuit and a control method, an image sensor system and a control method. Background technique [0002] A charge-coupled device (Charge-coupled Device, CCD) can be used as an image sensor. The CCD image sensor transfers the charge converted from the light signal to the storage node, and then outputs it through a source follower. [0003] In order to weaken the noise of the source follower, each pixel has to output two signals successively through the bit line, one is the reset level, and the other is the photosensitive signal based on the reset level. Therefore, the readout front end of the CCD image sensor basically adopts the readout form of Correlated Double Sampling (CDS). That is, the storage node is first reset to the power supply voltage, at this time the source follower will output the reset level, and the readout front-end will sample and save t...

AI Technical Summary

Problems solved by technology

[0005] The problem solved by the invention is that the common mode rejection ratio of the existing correlated double sampling circuit is relatively low

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