Correlated multi-sampling quantization circuit and working mode thereof

A multi-sampling and circuit technology, applied in TV, electrical components, color TV, etc., can solve the problems of wasting time and power consumption, affecting image quality, random noise, etc.

Pending Publication Date: 2021-02-26
ETOWNIP MICROELECTRONICS BEIJING CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, correlated multi-sampling technology will waste a lot of time and power consumption. Therefore, in 2018, Shang-Fu Yeh et al. proposed a conditional correlated multi-sampling working method. The core idea is to perform multiple quantization on small-amplitude signals. For large-amplitude signals, only one quantization is performed, which not only saves quantization time and power consumption, but also effectively suppresses random noise
However, in this way, for a signal in the middle amplitude, it is possible to perform multiple samplings, or it is possible to perform only one sampling, which results in signals of similar size, and the random noise contained in the final readout results is different in size.
Finally, abnormal fringes are introduced into the imaging results, affecting the imaging quality

Method used

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  • Correlated multi-sampling quantization circuit and working mode thereof
  • Correlated multi-sampling quantization circuit and working mode thereof
  • Correlated multi-sampling quantization circuit and working mode thereof

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Embodiment 1

[0081] Such as figure 1 As shown, a correlated multi-sampling quantization circuit includes two ramp generators (ramp generator 1 and ramp generator 2), a ramp selection circuit, a comparator, a counter and a data processing circuit. where the output of the two ramp generators V ramp1 and V ramp2 Connect the slope selection circuit, the output of the slope selection circuit V ramp Connect to the comparator, the comparator has two input terminals, one terminal is connected to the output signal V of the pixel sig , One terminal is connected to the output V of the slope selection circuit ramp , the output of the comparator V comp Connected to the counter, the counter is connected to the output V of the comparator comp To control the stop counting, the counter output C Connected to the data processing circuit and the slope control circuit, the data processing circuit is used to save the counting result of the counter and perform operations, and finally the data pro...

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Abstract

The invention discloses a correlated multi-sampling quantization circuit and a working mode thereof, and the circuit comprises a first slope generator, a second slope generator, a slope selection circuit, a comparator, a counter, and a data processing circuit, and the output ends of the first slope generator and the second slope generator are connected with the input end of the slope selection circuit. The output end of the slope selection circuit is connected with the first input end of the comparator, the second input end of the comparator is connected with input signals of pixels in the image sensor, the output end of the comparator is connected with the input end of the counter, and the output end of the counter is connected with the data processing circuit. Pixels in the image sensorcomprise a reset stage and an optical signal reading stage, and the optical signal reading stage comprises a signal intensity judgment process and a related multi-sampling quantization process. According to the invention, the imaging quality of the CMOS image sensor read by adopting the correlation multi-sampling technology is improved.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a correlated multi-sampling quantization circuit and its working method. Background technique [0002] In the design of CMOS image sensor, noise is an important index to evaluate its performance, which directly determines the imaging quality of the image sensor. Noise in CMOS image sensors usually originates from the dark current of pixels, random noise generated by readout circuits, and shot noise of photons. For low-light image sensors, the random noise contributed by the readout circuit is the main source of noise for the entire CMOS image sensor. In order to suppress the noise generated by the readout circuit, the technologies that have been published so far mainly include column-level signal amplification, correlated double sampling and correlated multi-sampling. Among them, the correlation multi-sampling is to use the principle that the expectation of Gaussian noi...

Claims

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Application Information

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IPC IPC(8): H04N5/357H04N5/374
CPCH04N25/616H04N25/76
Inventor冯光涛刘凯
OwnerETOWNIP MICROELECTRONICS BEIJING CO LTD