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Analog correlation multi-sampling reading device and method

A readout device and multi-sampling technology, applied in the direction of logic circuit connection/interface layout, reliability improvement modification, logic circuit coupling/interface using field effect transistors, etc., can solve problems such as dynamic range limitation and high power consumption, Achieve the effect of fewer capacitors and simple timing

Active Publication Date: 2021-08-24
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing analog CMS is implemented by accumulating the sum of M consecutive samples using an analog integrator circuit, however this solution is limited by the dynamic range
In addition, the implementation of digital CMS requires multiple analog-to-digital conversions, which requires faster analog-to-digital converters, resulting in higher power consumption

Method used

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  • Analog correlation multi-sampling reading device and method
  • Analog correlation multi-sampling reading device and method
  • Analog correlation multi-sampling reading device and method

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Embodiment Construction

[0024]The SC CMS module is connected after the programmable gain column amplifier (Column Amplifier, CLA), such as figure 2 As shown, it consists of an averager and a subtractor.

[0025] The averager consists of N+2 identical capacitors C and N+2 switches S. S 1 The left side is connected to the output of CLA, the right side is connected to C 1 The upper plate, C 1 The lower plate is grounded; S 2 The left connection of C 1 The upper plate, the right side is connected to C 2 The upper plate, C 2 The lower plate is grounded; S 3 The left connection of C 2 The upper plate, the right side is connected to C 3 The upper plate, C 3 The lower plate is grounded; with S 2 、C 2 and S 3 、C 3 This connection is repeated regularly until S N-1 、C N-1 so far, the C N-1 The upper plate of is named node A; S N , S N1 , S N2 The left side of the node A is connected, and the right side is connected to node C respectively. N 、C N1 、C N2 The upper plate, C N 、C N1 、C N2...

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Abstract

The invention relates to the field of sensor reading circuits, and aims to realize related multi-sampling operation by using a passive switched capacitor structure, avoid the problem of dynamic range of related multi-sampling of a traditional integrator and the problems of speed and power consumption of related multi-sampling in analog-to-digital conversion, use few circuit resources and simplified time sequence, and provides an analog correlation multi-sampling method suitable for a low-noise sensor. Therefore, the technical scheme used by the invention is that: the analog correlation multi-sampling reading device and method comprises an averager and a subtracter, wherein the averager is used for averaging a plurality of samples of reset and exposure signals before and after charge transfer, and storing the two average values respectively stored on capacitors CN and CN1; and the subtracter is used for subtracting the two average values on the capacitors CN and CN1 to obtain a final output value. The method is mainly applied to the reading occasion of the column-level amplifier with the programmable gain.

Description

technical field [0001] The invention relates to the field of sensor readout circuits, and uses correlated multiple sampling (Correlated Multiple Sampling, CMS) to read out the output of a sensor based on a passive switched capacitor (Switched-Capacitor, SC). In particular, it relates to analog correlated multi-sample readout methods. Background technique [0002] Low-noise image sensors are widely used in applications such as surveillance, security, night vision, and consumer electronics, where good low-light performance is essential. Once the column-level noise contribution is reduced by using a high column-level voltage gain, the noise contribution from the pixel will become the most dominant noise source, especially the noise generated by the source follower (SourceFollower, SF) in the pixel. While at the pixel level, the degrees of freedom left to the designer are usually limited, for example by using an intra-pixel thin oxide pMOS SF to reduce the noise contribution of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0185H03K19/003
CPCH03K19/0185H03K19/003
Inventor 徐江涛卫嘉豪聂凯明高志远高静王秀宇
Owner TIANJIN UNIV
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