Sampling circuit and image signal amplifying circuit each including feedback clamp block and image sensor including the image signal amplifying circuit
AssigneeSamsung Electronics Co., Ltd.
InventorsMin-sun KEEL, Young-kyun Jeong, Won-ho Choi, Ji-hun Shin
Life of this patent
Estimating the term…
Abstract
A sampling circuit samples an input signal by using at least one switch, at least one capacitor, an amplifier, and a clamp block connected between an output terminal and a negative input terminal of the amplifier. The clamp block prevents a difference between a voltage level of the output terminal of the amplifier and a voltage level of the negative input terminal of the amplifier during sampling from exceeding a maximum voltage difference.
Claims20
A sampling circuit that samples an input signal using at least one switch, at least one capacitor, and an amplifier, the sampling circuit comprising:
- a clamp block connected between an output terminal and a negative input terminal of the amplifier, wherein the clamp block prevents a difference between a voltage level of the output terminal of the amplifier and a voltage level of the negative input terminal of the amplifier during sampling from exceeding a maximum voltage difference.
An image signal amplifying circuit that samples and amplifies an image signal, the image signal amplifying circuit comprising:
- an amplifier having a positive input terminal connected to a reference voltage;
- a first switch having a first end receiving the image signal;
- a second switch having a first end connected to a negative input terminal of the amplifier and a second end connected to an output terminal of the amplifier;
- a first capacitor having a first end connected to a second end of the first switch, the first capacitor having a second end connected to the negative input terminal of the amplifier;
- a second capacitor having a first end connected to the negative input terminal of the amplifier;
- a third switch having a first end connected to a second end of the second capacitor, the third switch having a second end connected to the output terminal of the amplifier;
- a fourth switch having a first end connected to a common node of the second capacitor and the third switch, the fourth switch having a second end connected to the reference voltage;
- and
- a clamp block having a first end connected to the negative input terminal of the amplifier and a second end connected to the output terminal of the amplifier.
An image signal amplifying circuit that samples and amplifies an image signal, the image signal amplifying circuit comprising:
- an amplifier having a positive input terminal connected to a reference voltage;
- a first switch having a first end receiving the image signal;
- a second switch having a first end connected to a negative input terminal of the amplifier and a second end connected to an output terminal of the amplifier;
- a first capacitor having a first end connected to a second end of the first switch, the first capacitor having a second end connected to the negative input terminal of the amplifier;
- a second capacitor having a first end connected to the negative input terminal of the amplifier;
- and
- a clamp block having a first end connected to the negative input terminal of the amplifier and a second end connected to the output terminal of the amplifier, the clamp block being connected in parallel with the second switch.
Dependencies are inferred from the claim text.