Readout circuit

a circuit and readout technology, applied in the field of circuits, can solve problems such as image distortion, and achieve the effect of effective reading out signals

Active Publication Date: 2021-11-11
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003]The disclosure is directed to a readout circuit, and is capable of effectively reading out signals from a floating diffusion node of a pixel circuit.

Problems solved by technology

In general, because the effective voltage range of the floating diffusion node in the pixel circuit of the image senor is limited by the output voltage swing (OVS) of the readout circuit, the sensing signal provided by the photo diode of the pixel circuit may be truncated, and further causes the image distortion.

Method used

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Examples

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Embodiment Construction

[0011]It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the disclosure. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,”“comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,”“coupled,” and “mounted,” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings.

[0012]FIG. 1 is a schematic diagram illustrating a readout circuit and a pixel circuit according to an embodiment of the disclosure. Referring to FIG. 1, the readout circuit 100 includes a biasing circuit 110. The readout circuit 100 may be integrated into an integrated chip (IC), such as a fingerprint sensor IC....

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PUM

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Abstract

A readout circuit is provided. The readout circuit is coupled to a pixel circuit for reading out signals from the pixel circuit. The readout circuit includes a biasing circuit. The biasing circuit includes a cascode transistor and a biasing transistor. A first terminal of the cascode transistor is coupled to an output terminal of the biasing circuit and the pixel circuit. A second terminal of the cascode transistor is coupled to a first terminal of the biasing transistor. A second terminal of the biasing transistor is coupled to a negative voltage.

Description

BACKGROUNDTechnical Field[0001]The disclosure relates to a circuit, and particularly relates to a readout circuit.Description of Related Art[0002]In general, because the effective voltage range of the floating diffusion node in the pixel circuit of the image senor is limited by the output voltage swing (OVS) of the readout circuit, the sensing signal provided by the photo diode of the pixel circuit may be truncated, and further causes the image distortion. Therefore, regarding how to make the readout circuit have a wide output voltage swing, solutions of several embodiments are provided below.SUMMARY[0003]The disclosure is directed to a readout circuit, and is capable of effectively reading out signals from a floating diffusion node of a pixel circuit.[0004]The readout circuit of the disclosure is adapted to couple to a pixel circuit for reading out signals from the pixel circuit. The readout circuit includes a biasing circuit. The biasing circuit includes a cascode transistor and a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/378H04N5/3745H04N5/357H01L27/146
CPCH04N5/378H04N5/37457H01L27/14643H01L27/14612H04N5/3575H04N25/70H04N25/75H04N25/616H04N25/778
Inventor CHENG, KUO WEICHEN, CHI-TING
Owner NOVATEK MICROELECTRONICS CORP
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