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A Method of Reducing Sign Bits in Analog Circuits in Image Sensors

An image sensor and analog circuit technology, applied in image communication, color TV components, TV system components, etc., to achieve the effect of reducing chip area, chip area, and chip cost

Active Publication Date: 2019-06-21
天津安泰微电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, when Vsig is less than (Vth+Vdelta) value, Vout will have a negative value, so the output of the readout circuit needs to add an additional bit as a sign bit

Method used

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Embodiment

[0035] Embodiment: The technical solution of the present invention is a kind of method for reducing the analog circuit sign bit in the image sensor, it is characterized in that, this method comprises the following steps:

[0036] Step 1: Set the initial value to ensure that the initial value is greater than the sum of the reset signal threshold and the maximum value of the noise;

[0037] Step 2: Read the non-ideal reset value, including initial value, ideal reset value, reset signal threshold and noise;

[0038] Step 3: quantify with AD circuit;

[0039] Step 4: Reverse the quantized value and store it;

[0040] Step 5: Read out the signal value, including the signal value, the ideal reset value, and the non-ideal value of the noise;

[0041] Step 6: Quantize with the AD circuit, and accumulate on the reset value after inversion;

[0042] Step 7: output the result to the digital circuit;

[0043] Step 8: Compensate the signal value in the digital circuit, that is, subtrac...

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Abstract

The present invention belongs to the technical field of image sensor circuits, and in particular relates to a method for reducing the sign bit of an analog circuit in an image sensor. The method includes the following steps: Step S1: Setting an initial value to ensure that the initial value is greater than the reset signal threshold and the maximum value of the noise; step S2: read out the non-ideal reset value, including the initial value, ideal reset value, reset signal threshold and noise; step S3: quantify with the AD circuit; step S4: reverse the quantized value and perform Storage; Step 5: Read signal value, including signal value, ideal reset value, and non-ideal value of noise; Step S6: Quantize with AD circuit, and accumulate on the reset value after inversion; Step S7: Output result to the digital circuit; Step 8: Compensate the signal value in the digital circuit, that is, subtract the initial value and restore it to a signed number. The invention can greatly reduce chip area, reduce research and development costs, manufacturing costs and labor costs.

Description

technical field [0001] The invention belongs to the technical field of image sensor circuits, and in particular relates to a method for reducing the sign bits of an analog circuit in an image sensor. Background technique [0002] The photosensitive part of the image sensor is composed of an array of pixels, such as figure 1 The 4T pixel structure shown. An ideal image sensor pixel (diode) accumulates charge to form an image when exposed to light. Since the actual circuit is not completely close to 0 in the reset state, it is necessary to read the reset signal before actually outputting the image, and then make a difference between the accumulated image signal and the reset signal. [0003] The currently widely used readout logic is figure 2 shown. Firstly, the reset value is quantified according to the reset voltage, and then the reset value is inverted, and finally the signal value quantized by the signal voltage is subtracted from the reset value to obtain an image. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/357H04N5/378
CPCH04N25/60H04N25/75
Inventor 钟晨峰
Owner 天津安泰微电子技术有限公司