Light sensor

A light sensor, comprising:

• a plurality of pixels, each pixel comprising:
• a plurality of photodiodes, each photodiode comprising a node;
• and
• an amplifier comprising:
• a first part common to each of the photodiodes, the first part comprising an output terminal, and
• a plurality of second parts, each second part corresponding to one of the photodiodes, each second part comprising:
• a first switch and a second switch configured to selectively couple the second part to the first part, and
• a feedback circuit coupled between the node of the corresponding photodiode and the output terminal of the amplifier;
• and
• a control circuit configured to, for each pixel:
• selectively couple, via the first switch and the second switch, the second part corresponding to a selected photodiode to the first part of the amplifier;
• decouple, via the first switch and the second switch, the second parts corresponding to non-selected photodiodes from the first part of the amplifier;
• and
• read out an output signal from the output terminal of the amplifier, the output signal corresponding to the selected photodiode.

A method for reading a first photodiode from a plurality of photodiodes in a pixel of a light sensor, the method comprising:

• selecting, by a control circuit, the first photodiode from the plurality of photodiodes;
• generating, by the control circuit, a first control signal to close a first switch and a second switch of a second part of a first amplifier corresponding to the selected first photodiode, wherein the first switch is coupled between a first terminal of a transistor of the second part and a first part of the first amplifier, and the second switch is coupled between a second terminal of the transistor of the second part and the first part of the first amplifier;
• generating, by the control circuit, a second control signal to close a third switch coupled between a feedback circuit and an output terminal of the first amplifier, wherein the feedback circuit is coupled between a node of the selected first photodiode and the output terminal of the first amplifier;
• generating, by the control circuit, a third control signal to open a first switch and a second switch of a second part of the first amplifier corresponding to a non-selected photodiode from the plurality of photodiodes;
• generating, by the control circuit, a fourth control signal to open a third switch corresponding to the non-selected photodiode;
• reading, by the control circuit, an output signal from the output terminal of the first amplifier, wherein the output signal corresponds to the selected first photodiode;
• and
• processing the output signal to determine an intensity of light incident on the selected first photodiode.