Image sensing device using adaptively adjusted pre-charge current
AssigneeSK hynix Inc.
InventorsYu Jin Park, Nam Ryeol Kim, Kang Bong Seo, Jeong Eun Song, Jung Soon Shin, Seung Hwan Lee
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Abstract
An image sensing device includes: a control circuit coupled between an output terminal of a pixel signal and a high voltage terminal, and configured to generate a control voltage corresponding to a voltage level of the pixel signal; and a current supplying circuit coupled between the output terminal and the high voltage terminal, and configured to supply a pre-charge current, which is configured to be adaptively adjusted according to the voltage level of the pixel signal, to the output terminal based on the control voltage.
Claims20
An image sensing device comprising:
- a control circuit coupled between an output terminal of a pixel signal and a high voltage terminal, and configured to generate a control voltage whose voltage level is changed corresponding to a slope of the pixel signal;
- and
- a current supplying circuit coupled between the output terminal and the high voltage terminal, and configured to supply a pre-charge current, which is configured to be adaptively adjusted according to the slope of the pixel signal, to the output terminal based on the control voltage.
An image sensing device comprising:
- a reference circuit coupled between a high voltage terminal and a control node, and configured to supply a reference voltage to the control node based on a reference control signal;
- a sensing circuit coupled between the control node and an output terminal of a pixel signal, and configured to sense a slope of the pixel signal based on the reference control signal and a boost control signal, wherein the sensing circuit is configured to supply a control voltage to the control node according to the slope sensed;
- a subtraction circuit coupled between the high voltage terminal and a low voltage terminal, and configured to generate a subtraction current corresponding to the reference voltage;
- and
- a current supplying circuit coupled between the output terminal and the high voltage terminal, and configured to supply a pre-charge current, to which the subtraction current is applied, to the output terminal based on the control voltage and the subtraction current.
An image sensing device comprising:
- a reference pixel;
- a target pixel;
- an amplifier coupled in common to the reference pixel and the target pixel, and configured to output a pixel signal of the target pixel through an output terminal during a readout period of a target row time;
- and
- a pre-charger configured to supply a pre-charge current, which is configured to be adaptively adjusted according to a control voltage whose voltage level is changed corresponding to a slope of the pixel signal, to the output terminal during an initial time of the readout period.
Dependencies are inferred from the claim text.