A pixel comprising: - a photo-sensitive element, which is a pinned photodiode, for generating charges in response to incident radiation; - a sense node; - a transfer gate, connected between the photosensitive element and the sense node, for controlling transfer of charges to the sense node; - a reset switch having its source input connected to the sense node for resetting the sense node to a predetermined voltage and its drain input connected to a supply line (Vdd) and to a first control line which is operable to discharge the first and/or the second sample stage (120, 130); - a first buffer amplifier (AMP1, M2) having its gate input connected to the sense node and its drain input connected to the supply line (Vdd) and to the first control line; - a first sample stage comprising a first sample switch (Sample2) connected to an output of the first buffer amplifier (AMP1, M2), and a storage element for storing a first sample value, in particular a signal value, of the sense node, wherein the first sample stage is selectively operable through the first sample switch (Sample2); - a second sample stage connected in cascade with the first sample stage, the second sample stage comprising a second sample switch (Sample1) connected to an output of the first sample switch (Sample2), and a further storage element for storing a second sample value, in particular a reset value, of the sense node, wherein the second sample stage is selectively operable through the first sample switch (Sample2) and the second sample switch (Sample 1); and - a second buffer amplifier (AMP2, M4) having an input connected to the second sample stage; - wherein the transfer gate is adapted for transferring substantially all charge from the photosensitive element to the sense node when the transfer gate is opened. - a photo-sensitive element, which is a pinned photodiode, for generating charges in response to incident radiation; - a sense node; - a transfer gate, connected between the photosensitive element and the sense node, for controlling transfer of charges to the sense node; - a reset switch having its source input connected to the sense node for resetting the sense node to a predetermined voltage and its drain input connected to a supply line (Vdd) and to a first control line which is operable to discharge the first and/or the second sample stage (120, 130); - a first buffer amplifier (AMP1, M2) having its gate input connected to the sense node and its drain input connected to the supply line (Vdd) and to the first control line; - a first sample stage comprising a first sample switch (Sample2) connected to an output of the first buffer amplifier (AMP1, M2), and a storage element for storing a first sample value, in particular a signal value, of the sense node, wherein the first sample stage is selectively operable through the first sample switch (Sample2); - a second sample stage connected in cascade with the first sample stage, the second sample stage comprising a second sample switch (Sample1) connected to an output of the first sample switch (Sample2), and a further storage element for storing a second sample value, in particular a reset value, of the sense node, wherein the second sample stage is selectively operable through the first sample switch (Sample2) and the second sample switch (Sample 1); and - a second buffer amplifier (AMP2, M4) having an input connected to the second sample stage; - wherein the transfer gate is adapted for transferring substantially all charge from the photosensitive element to the sense node when the transfer gate is opened.