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Low-noise and wide-dynamic range image sensor related multi-sampling circuit

A wide dynamic range, image sensor technology, used in image communication, television, electrical components, etc., can solve the problem of reducing and reducing the total dynamic range of the sensor

Active Publication Date: 2017-07-18
GPIXEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the effective swing of Vpix decreases as the number of integrations increases, resulting in a decrease in the total dynamic range of the sensor

Method used

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  • Low-noise and wide-dynamic range image sensor related multi-sampling circuit
  • Low-noise and wide-dynamic range image sensor related multi-sampling circuit
  • Low-noise and wide-dynamic range image sensor related multi-sampling circuit

Examples

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Embodiment 1

[0014] like figure 2 , 3 As shown, the low noise wide dynamic range image sensor related multiple sampling circuit of the present invention includes an integrator, an integral control unit, a readout control switch, an analog-to-digital conversion unit, and a data processing unit; the integral control unit includes a logic circuit and an analog Comparators.

[0015] The integrator receives and integrates the pixel signal Vpix output by the pixel output buffer; the analog comparator outputs the integration result Vpix output by each loop integrator i with the set voltage threshold V 0 are compared when V i less than V 0 When , the logic circuit outputs a signal to control the integrator to carry out the integration of the next cycle, when V i greater than or equal to V 0 When , the output signal of the logic circuit controls the readout control switch S5 to close so that the final integration result is transmitted to the analog-to-digital conversion unit, so that i at th...

Embodiment 2

[0017] like figure 2 , 4 As shown, the low-noise wide dynamic range image sensor related multi-sampling circuit of the present invention includes an integrator, an integral control unit, a readout control switch, an analog-to-digital conversion unit, and a data processing unit; the integral control unit includes a logic circuit, an analog Digital conversion circuit and digital comparator.

[0018] The integrator receives and integrates the pixel signal Vpix output by the pixel output buffer; the analog-to-digital conversion circuit converts the integration result output by the integrator into a digital signal V i ’ and output to the digital comparator; the digital comparator will V i ’ with the set voltage threshold V 0 are compared when V i ’less than or equal to V 0 When , the logic circuit outputs a signal to control the integrator to carry out the integration of the next cycle, when V i greater than or equal to V 0 When , the output signal of the logic circuit cont...

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Abstract

The invention relates to a low-noise and wide-dynamic range image sensor related multi-sampling circuit. An integrator in the circuit performs integration on a pixel signal output by a pixel output cache; when an integration result is less than a preset voltage threshold value, an integration control unit controls the integrator to perform the integration of the next cycle, or the integration control unit controls on-off of a read control switch so as to output a final integration result to an analogue-to-digital conversion unit, and the integration frequency is output to a data processing unit; the A / D conversion unit converts the final integration result into quantized result data and then transmits the quantized result data to the data processing unit; the data processing unit divides the integration frequency by the quantized result data to obtain the final sampling result data. The integration in different frequencies is performed aiming at different pixels so as to achieve an aim of performing multiple integration on a small signal and performing moderate integration on a big signal; the low noise and wide dynamic range of the image sensor can be realized at the same time.

Description

technical field [0001] The invention belongs to the technical field of semiconductor image sensing, and relates to a circuit for realizing a low-noise wide dynamic range image sensor by adopting correlation multiple sampling technology. Background technique [0002] The noise of the sensor can be reduced by correlation multiple sampling technology. A typical correlated multiple sampling circuit such as Figure 1a As shown, it includes an integrator and a readout control switch S5, where the integrator is composed of amplifier AMP1, sampling capacitor C1, feedback capacitor C2 and four switches S0, S1, S2, S3, S4; the circuit is firstly paired by closing switch S0 C2 and the circuit reset. Then open switch S0, close switches S1 and S3, as Figure 1b As shown; after the signal on C1 is stable, the switches S1 and S3 are turned off, and the pixel signal is sampled to the capacitor C1. Then close the switches S2 and S4, such as Figure 1c As shown, the signal charge is trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/378
CPCH04N25/75
Inventor 刘洋郭杨钰王欣洋马成李杨
Owner GPIXEL
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