Image sensor

An image sensor comprising an array of pixels and control logic which is arranged to control operation of the pixels, each of the pixels comprising:

• a pinned photodiode;
• a first sense node;
• a second sense node;
• a transfer gate connected between the pinned photodiode and the first sense node;
• a first reset transistor connected between a voltage reference line and the second sense node;
• a second reset transistor connected between the first sense node and the second sense node;
• and
• a buffer amplifier having an input connected to the first sense node;
• the image sensor further comprising:
• a first reset control line connected between the control logic and the first reset transistor in each of a plurality of pixels of the array;
• a second reset control line connected between the control logic and the second reset transistor in each of the plurality of pixels of the array;
• and wherein the control logic is arranged to selectively operate the pixels in a low conversion gain mode and in a high conversion gain mode and in each of the conversion gain modes the control logic is arranged to operate one of the first reset control line and the second reset control line to continuously switch on one of the first reset transistor and the second reset transistor during a readout period of an operational cycle of the pixels.