Readout circuit, image sensor, and electronic device
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorLiang Li
Life of this patent
Estimating the term…
Abstract
A readout circuit, an image sensor and an electronic device are provided, which could effectively reduce an area and power consumption of the image sensor. The readout circuit includes a plurality of capacitors, a switch circuit and an output circuit; where the plurality of capacitors are connected to the output circuit through the switch circuit; the plurality of capacitors are configured to store output signals of a plurality of pixel circuits, respectively; and the output circuit is configured to output signals stored by the plurality of capacitors through the switch circuit one-by-one.
Claims12
A readout circuit, wherein the readout circuit is configured to connect to a plurality of pixel circuits, and output signals of the plurality of pixel circuits are respectively input signals of the readout circuit, the readout circuit comprises:
- a plurality of capacitors;
- a switch circuit;
- and an output circuit;
- wherein,
- the plurality of capacitors are connected to the output circuit through the switch circuit;
- the plurality of capacitors are configured to store output signals of the plurality of pixel circuits, respectively;
- and
- the output circuit is configured to output signals stored by the plurality of capacitors through the switch circuit one-by-one;
- wherein the output circuit comprises an operational amplifier configured to amplify and output the signals stored by the plurality of capacitors, the output circuit further comprises:
- a feedback capacitor, a first switch, a second switch and a third switch;
- wherein two ends of the first switch are connected to an input end and an output end of the operational amplifier, respectively, a left plate of the feedback capacitor is connected to the input end of the operational amplifier, a right plate of the feedback capacitor is connected to the output end of the operational amplifier through the third switch, and two ends of the second switch are connected to the right plate of the feedback capacitor and a voltage source, respectively.
An image sensor, comprising:
- a readout circuit, wherein the readout circuit is configured to connect to a plurality of pixel circuits, and output signals of the plurality of pixel circuits are respectively input signals of the readout circuit, the readout circuit comprises:
- a plurality of capacitors;
- a switch circuit;
- and an output circuit;
- wherein,
- the plurality of capacitors are connected to the output circuit through the switch circuit;
- the plurality of capacitors are configured to store output signals of the plurality of pixel circuits, respectively;
- and
- the output circuit is configured to output signals stored by the plurality of capacitors through the switch circuit one-by-one;
- wherein the output circuit comprises an operational amplifier configured to amplify and output the signals stored by the plurality of capacitors, the output circuit further comprises:
- a feedback capacitor, a first switch, a second switch and a third switch;
- wherein two ends of the first switch are connected to an input end and an output end of the operational amplifier, respectively, a left plate of the feedback capacitor is connected to the input end of the operational amplifier, a right plate of the feedback capacitor is connected to the output end of the operational amplifier through the third switch, and two ends of the second switch are connected to the right plate of the feedback capacitor and a voltage source, respectively.
An electronic device, comprising:
- a readout circuit, wherein the readout circuit is configured to connect to a plurality of pixel circuits, and output signals of the plurality of pixel circuits are respectively input signals of the readout circuit, the readout circuit comprises:
- a plurality of capacitors;
- a switch circuit;
- and an output circuit;
- wherein,
- the plurality of capacitors are connected to the output circuit through the switch circuit;
- the plurality of capacitors are configured to store output signals of the plurality of pixel circuits, respectively;
- and
- the output circuit is configured to output signals stored by the plurality of capacitors through the switch circuit one-by-one;
- wherein the output circuit comprises an operational amplifier configured to amplify and output the signals stored by the plurality of capacitors, the output circuit further comprises:
- a feedback capacitor, a first switch, a second switch and a third switch;
- wherein two ends of the first switch are connected to an input end and an output end of the operational amplifier, respectively, a left plate of the feedback capacitor is connected to the input end of the operational amplifier, a right plate of the feedback capacitor is connected to the output end of the operational amplifier through the third switch, and two ends of the second switch are connected to the right plate of the feedback capacitor and a voltage source, respectively.
Dependencies are inferred from the claim text.