Analog-digital converter, solid-state image capturing apparatus, and electronic information device
AssigneeSharp Kabushiki Kaisha
InventorShinji Hattori
Life of this patent
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Abstract
An analog-digital converter is provided. The analog-digital converter includes: a comparing section for comparing an input signal voltage and an analog ramp voltage in which a voltage level gradually increases; and a latch section for storing a digital value of a digital ramp signal, in which a digital value of a voltage level gradually increases in synchronization with the analog ramp voltage when the analog ramp voltage or a voltage corresponding to the analog ramp voltage and the input signal voltage are equal. A voltage in which part or all of a plurality of analog ramp signals are added is used as the analog ramp voltage so that a gain is selectable.
Claims22
An analog-digital converter, comprising:
- a comparing section for comparing an input signal voltage and an analog ramp voltage in which a voltage level gradually increases;
- and
- a latch section for storing a digital value of a digital ramp signal, in which a digital value of a voltage level gradually increases in synchronization with the analog ramp voltage, when the analog ramp voltage or a voltage corresponding to the analog ramp voltage, and the input signal voltage are equal;
- wherein a voltage in which a plurality of analog ramp signals are added is used as the analog ramp voltage so that a gain is selectable, and
- wherein the analog-digital converter does not require an amplifier for gain selection.
Dependencies are inferred from the claim text.